Mercurial > gnulib
annotate lib/fts.c @ 9129:79b0e6e0f7ba
* lib/fts.c (fts_read): Upon failure to chdir into a subdirectory,
set fts_info to FTS_DNR, not to FTS_ERR, so that the caller knows
it has valid stat data. This bug would cause du not to count the
sizes of inaccessible directories.
Patch by Jose Maria Plans, reported in http://bugzilla.redhat.com/250077
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Mon, 30 Jul 2007 12:16:34 +0000 |
| parents | 9ddbddb3fc43 |
| children | bbbbbf4cd1c5 |
| rev | line source |
|---|---|
| 5858 | 1 /* Traverse a file hierarchy. |
| 2 | |
|
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3 Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
| 5858 | 4 |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software Foundation, | |
| 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 /*- | |
| 20 * Copyright (c) 1990, 1993, 1994 | |
| 21 * The Regents of the University of California. All rights reserved. | |
| 22 * | |
| 23 * Redistribution and use in source and binary forms, with or without | |
| 24 * modification, are permitted provided that the following conditions | |
| 25 * are met: | |
| 26 * 1. Redistributions of source code must retain the above copyright | |
| 27 * notice, this list of conditions and the following disclaimer. | |
| 28 * 2. Redistributions in binary form must reproduce the above copyright | |
| 29 * notice, this list of conditions and the following disclaimer in the | |
| 30 * documentation and/or other materials provided with the distribution. | |
| 31 * 4. Neither the name of the University nor the names of its contributors | |
| 32 * may be used to endorse or promote products derived from this software | |
| 33 * without specific prior written permission. | |
| 34 * | |
| 35 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 38 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 45 * SUCH DAMAGE. | |
| 46 */ | |
| 47 | |
|
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48 #include <config.h> |
| 5858 | 49 |
| 50 #if defined(LIBC_SCCS) && !defined(lint) | |
| 51 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; | |
| 52 #endif /* LIBC_SCCS and not lint */ | |
| 53 | |
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54 #include "fts_.h" |
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55 |
| 5858 | 56 #if HAVE_SYS_PARAM_H || defined _LIBC |
| 57 # include <sys/param.h> | |
| 58 #endif | |
| 59 #ifdef _LIBC | |
| 60 # include <include/sys/stat.h> | |
| 61 #else | |
| 62 # include <sys/stat.h> | |
| 63 #endif | |
| 64 #include <fcntl.h> | |
| 65 #include <errno.h> | |
| 66 #include "dirfd.h" | |
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67 #include <stdbool.h> |
| 5858 | 68 #include <stdlib.h> |
| 69 #include <string.h> | |
| 70 #include <unistd.h> | |
| 71 | |
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72 #if ! _LIBC |
| 7151 | 73 # include "fcntl--.h" |
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74 # include "lstat.h" |
| 7151 | 75 # include "openat.h" |
| 76 # include "unistd--.h" | |
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77 # include "same-inode.h" |
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78 #endif |
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79 |
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80 #include <dirent.h> |
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81 #ifndef _D_EXACT_NAMLEN |
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82 # define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name) |
| 5858 | 83 #endif |
| 84 | |
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85 #if HAVE_STRUCT_DIRENT_D_TYPE |
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86 /* True if the type of the directory entry D is known. */ |
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87 # define DT_IS_KNOWN(d) ((d)->d_type != DT_UNKNOWN) |
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88 /* True if the type of the directory entry D must be T. */ |
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89 # define DT_MUST_BE(d, t) ((d)->d_type == (t)) |
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90 #else |
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91 # define DT_IS_KNOWN(d) false |
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92 # define DT_MUST_BE(d, t) false |
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93 #endif |
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94 |
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95 enum Fts_stat |
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96 { |
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97 FTS_NO_STAT_REQUIRED = 1, |
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98 FTS_STAT_REQUIRED = 2 |
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99 }; |
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100 |
| 5858 | 101 #ifdef _LIBC |
| 102 # undef close | |
| 103 # define close __close | |
| 104 # undef closedir | |
| 105 # define closedir __closedir | |
| 106 # undef fchdir | |
| 107 # define fchdir __fchdir | |
| 108 # undef open | |
| 109 # define open __open | |
| 110 # undef opendir | |
| 111 # define opendir __opendir | |
| 112 # undef readdir | |
| 113 # define readdir __readdir | |
| 114 #else | |
| 115 # undef internal_function | |
| 116 # define internal_function /* empty */ | |
| 117 #endif | |
| 118 | |
| 119 #ifndef __set_errno | |
| 120 # define __set_errno(Val) errno = (Val) | |
| 121 #endif | |
| 122 | |
| 123 #ifndef __attribute__ | |
| 124 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ | |
| 125 # define __attribute__(x) /* empty */ | |
| 126 # endif | |
| 127 #endif | |
| 128 | |
| 129 #ifndef ATTRIBUTE_UNUSED | |
| 130 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
| 131 #endif | |
| 132 | |
| 7151 | 133 /* If this host provides the openat function, then we can avoid |
| 134 attempting to open "." in some initialization code below. */ | |
| 135 #ifdef HAVE_OPENAT | |
| 136 # define HAVE_OPENAT_SUPPORT 1 | |
| 137 #else | |
| 138 # define HAVE_OPENAT_SUPPORT 0 | |
| 139 #endif | |
| 5858 | 140 |
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141 #ifdef NDEBUG |
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142 # define fts_assert(expr) ((void) 0) |
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143 #else |
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144 # define fts_assert(expr) \ |
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145 do \ |
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146 { \ |
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147 if (!(expr)) \ |
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148 abort (); \ |
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149 } \ |
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150 while (false) |
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151 #endif |
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152 |
| 5858 | 153 static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; |
| 154 static FTSENT *fts_build (FTS *, int) internal_function; | |
| 155 static void fts_lfree (FTSENT *) internal_function; | |
| 156 static void fts_load (FTS *, FTSENT *) internal_function; | |
| 157 static size_t fts_maxarglen (char * const *) internal_function; | |
| 158 static void fts_padjust (FTS *, FTSENT *) internal_function; | |
| 159 static bool fts_palloc (FTS *, size_t) internal_function; | |
| 160 static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; | |
| 161 static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; | |
| 162 static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) | |
| 163 internal_function; | |
| 164 | |
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165 #if GNULIB_FTS |
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166 # include "fts-cycle.c" |
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167 #else |
| 5872 | 168 static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } |
| 169 static void leave_dir (FTS *fts, FTSENT *ent) {} | |
| 170 static bool setup_dir (FTS *fts) { return true; } | |
| 171 static void free_dir (FTS *fts) {} | |
| 172 #endif | |
| 173 | |
| 5858 | 174 #ifndef MAX |
| 175 # define MAX(a,b) ((a) > (b) ? (a) : (b)) | |
| 176 #endif | |
| 177 | |
| 178 #ifndef SIZE_MAX | |
| 179 # define SIZE_MAX ((size_t) -1) | |
| 180 #endif | |
| 181 | |
| 182 #ifndef O_DIRECTORY | |
| 183 # define O_DIRECTORY 0 | |
| 184 #endif | |
| 185 | |
| 186 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2]))) | |
| 7151 | 187 #define STREQ(a, b) (strcmp ((a), (b)) == 0) |
| 5858 | 188 |
| 189 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
| 190 #define ISSET(opt) (sp->fts_options & (opt)) | |
| 191 #define SET(opt) (sp->fts_options |= (opt)) | |
| 192 | |
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193 /* FIXME: make this a function */ |
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194 #define RESTORE_INITIAL_CWD(sp) \ |
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195 (fd_ring_clear (&((sp)->fts_fd_ring)), \ |
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196 FCHDIR ((sp), (ISSET (FTS_CWDFD) ? AT_FDCWD : (sp)->fts_rfd))) |
| 7151 | 197 |
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198 /* FIXME: FTS_NOCHDIR is now misnamed. |
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199 Call it FTS_USE_FULL_RELATIVE_FILE_NAMES instead. */ |
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200 #define FCHDIR(sp, fd) \ |
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201 (!ISSET(FTS_NOCHDIR) && (ISSET(FTS_CWDFD) \ |
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202 ? (cwd_advance_fd ((sp), (fd), true), 0) \ |
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203 : fchdir (fd))) |
| 7151 | 204 |
| 5858 | 205 |
| 206 /* fts_build flags */ | |
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207 /* FIXME: make this an enum */ |
| 5858 | 208 #define BCHILD 1 /* fts_children */ |
| 209 #define BNAMES 2 /* fts_children, names only */ | |
| 210 #define BREAD 3 /* fts_read */ | |
| 211 | |
| 212 #if FTS_DEBUG | |
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213 # include <inttypes.h> |
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214 # include <stdint.h> |
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215 # include <stdio.h> |
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216 # include "getcwdat.h" |
| 5858 | 217 bool fts_debug = false; |
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218 # define Dprintf(x) do { if (fts_debug) printf x; } while (false) |
| 5858 | 219 #else |
| 220 # define Dprintf(x) | |
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221 # define fd_ring_check(x) |
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222 # define fd_ring_print(a, b, c) |
| 5858 | 223 #endif |
| 224 | |
| 225 #define LEAVE_DIR(Fts, Ent, Tag) \ | |
| 5872 | 226 do \ |
| 227 { \ | |
| 5858 | 228 Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ |
| 5872 | 229 leave_dir (Fts, Ent); \ |
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230 fd_ring_check (Fts); \ |
| 5872 | 231 } \ |
| 232 while (false) | |
| 5858 | 233 |
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234 static void |
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235 fd_ring_clear (I_ring *fd_ring) |
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236 { |
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237 while ( ! i_ring_empty (fd_ring)) |
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238 { |
|
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239 int fd = i_ring_pop (fd_ring); |
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240 if (0 <= fd) |
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241 close (fd); |
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242 } |
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243 } |
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244 |
|
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245 /* Overload the fts_statp->st_size member (otherwise unused, when |
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246 fts_info is FTS_NSOK) to indicate whether fts_read should stat |
|
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247 this entry or not. */ |
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|
248 static void |
|
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249 fts_set_stat_required (FTSENT *p, bool required) |
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250 { |
|
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251 fts_assert (p->fts_info == FTS_NSOK); |
|
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252 p->fts_statp->st_size = (required |
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253 ? FTS_STAT_REQUIRED |
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254 : FTS_NO_STAT_REQUIRED); |
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255 } |
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|
256 |
| 7151 | 257 /* file-descriptor-relative opendir. */ |
| 258 /* FIXME: if others need this function, move it into lib/openat.c */ | |
| 259 static inline DIR * | |
| 260 internal_function | |
| 261 opendirat (int fd, char const *dir) | |
| 262 { | |
| 263 int new_fd = openat (fd, dir, O_RDONLY); | |
| 264 DIR *dirp; | |
| 265 | |
| 266 if (new_fd < 0) | |
| 267 return NULL; | |
| 268 dirp = fdopendir (new_fd); | |
| 269 if (dirp == NULL) | |
| 270 { | |
| 271 int saved_errno = errno; | |
| 272 close (new_fd); | |
| 273 errno = saved_errno; | |
| 274 } | |
| 275 return dirp; | |
| 276 } | |
| 277 | |
|
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278 /* Virtual fchdir. Advance SP's working directory file descriptor, |
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279 SP->fts_cwd_fd, to FD, and push the previous value onto the fd_ring. |
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280 CHDIR_DOWN_ONE is true if FD corresponds to an entry in the directory |
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281 open on sp->fts_cwd_fd; i.e., to move the working directory one level |
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282 down. */ |
| 7151 | 283 static void |
| 284 internal_function | |
|
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285 cwd_advance_fd (FTS *sp, int fd, bool chdir_down_one) |
| 7151 | 286 { |
| 287 int old = sp->fts_cwd_fd; | |
|
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288 fts_assert (old != fd || old == AT_FDCWD); |
|
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289 |
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290 if (chdir_down_one) |
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291 { |
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292 /* Push "old" onto the ring. |
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293 If the displaced file descriptor is non-negative, close it. */ |
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294 int prev_fd_in_slot = i_ring_push (&sp->fts_fd_ring, old); |
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295 fd_ring_print (sp, stderr, "post-push"); |
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296 if (0 <= prev_fd_in_slot) |
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297 close (prev_fd_in_slot); /* ignore any close failure */ |
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298 } |
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299 else if ( ! ISSET (FTS_NOCHDIR)) |
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300 { |
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301 if (0 <= old) |
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302 close (old); /* ignore any close failure */ |
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303 } |
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|
304 |
| 7151 | 305 sp->fts_cwd_fd = fd; |
| 306 } | |
| 307 | |
| 5858 | 308 /* Open the directory DIR if possible, and return a file |
| 309 descriptor. Return -1 and set errno on failure. It doesn't matter | |
| 310 whether the file descriptor has read or write access. */ | |
| 311 | |
| 7151 | 312 static inline int |
| 5858 | 313 internal_function |
| 7151 | 314 diropen (FTS const *sp, char const *dir) |
| 5858 | 315 { |
| 7151 | 316 int open_flags = (O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK |
| 317 | (ISSET (FTS_PHYSICAL) ? O_NOFOLLOW : 0)); | |
| 318 | |
| 319 return (ISSET (FTS_CWDFD) | |
| 320 ? openat (sp->fts_cwd_fd, dir, open_flags) | |
| 321 : open (dir, open_flags)); | |
| 5858 | 322 } |
| 323 | |
| 324 FTS * | |
| 325 fts_open (char * const *argv, | |
| 326 register int options, | |
| 327 int (*compar) (FTSENT const **, FTSENT const **)) | |
| 328 { | |
| 329 register FTS *sp; | |
| 330 register FTSENT *p, *root; | |
| 331 register size_t nitems; | |
| 7151 | 332 FTSENT *parent = NULL; |
| 333 FTSENT *tmp = NULL; /* pacify gcc */ | |
| 5858 | 334 size_t len; |
|
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Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
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|
335 bool defer_stat; |
| 5858 | 336 |
| 337 /* Options check. */ | |
| 338 if (options & ~FTS_OPTIONMASK) { | |
| 339 __set_errno (EINVAL); | |
| 340 return (NULL); | |
| 341 } | |
| 7151 | 342 if ((options & FTS_NOCHDIR) && (options & FTS_CWDFD)) { |
| 343 __set_errno (EINVAL); | |
| 344 return (NULL); | |
| 345 } | |
| 346 if ( ! (options & (FTS_LOGICAL | FTS_PHYSICAL))) { | |
| 347 __set_errno (EINVAL); | |
| 348 return (NULL); | |
| 349 } | |
| 5858 | 350 |
| 351 /* Allocate/initialize the stream */ | |
| 352 if ((sp = malloc(sizeof(FTS))) == NULL) | |
| 353 return (NULL); | |
| 354 memset(sp, 0, sizeof(FTS)); | |
| 355 sp->fts_compar = compar; | |
| 356 sp->fts_options = options; | |
| 357 | |
| 358 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
| 7151 | 359 if (ISSET(FTS_LOGICAL)) { |
| 5858 | 360 SET(FTS_NOCHDIR); |
| 7151 | 361 CLR(FTS_CWDFD); |
| 362 } | |
| 363 | |
| 364 /* Initialize fts_cwd_fd. */ | |
| 365 sp->fts_cwd_fd = AT_FDCWD; | |
| 366 if ( ISSET(FTS_CWDFD) && ! HAVE_OPENAT_SUPPORT) | |
| 367 { | |
| 368 /* While it isn't technically necessary to open "." this | |
| 369 early, doing it here saves us the trouble of ensuring | |
| 370 later (where it'd be messier) that "." can in fact | |
| 371 be opened. If not, revert to FTS_NOCHDIR mode. */ | |
| 372 int fd = open (".", O_RDONLY); | |
| 373 if (fd < 0) | |
| 374 { | |
| 375 /* Even if `.' is unreadable, don't revert to FTS_NOCHDIR mode | |
| 376 on systems like Linux+PROC_FS, where our openat emulation | |
| 377 is good enough. Note: on a system that emulates | |
| 378 openat via /proc, this technique can still fail, but | |
| 379 only in extreme conditions, e.g., when the working | |
| 380 directory cannot be saved (i.e. save_cwd fails) -- | |
|
7402
82dc76cfd521
* fts.c (fts_open): Tiny comment change.
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7396
diff
changeset
|
381 and that happens on Linux only when "." is unreadable |
| 7151 | 382 and the CWD would be longer than PATH_MAX. |
| 383 FIXME: once Linux kernel openat support is well established, | |
| 384 replace the above open call and this entire if/else block | |
| 385 with the body of the if-block below. */ | |
| 386 if ( openat_needs_fchdir ()) | |
| 387 { | |
| 388 SET(FTS_NOCHDIR); | |
| 389 CLR(FTS_CWDFD); | |
| 390 } | |
| 391 } | |
| 392 else | |
| 393 { | |
| 394 close (fd); | |
| 395 } | |
| 396 } | |
| 5858 | 397 |
| 398 /* | |
| 5907 | 399 * Start out with 1K of file name space, and enough, in any case, |
| 400 * to hold the user's file names. | |
| 5858 | 401 */ |
| 402 #ifndef MAXPATHLEN | |
| 403 # define MAXPATHLEN 1024 | |
| 404 #endif | |
|
6611
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Sync from the stable (b5) branch of coreutils:
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|
405 { |
|
e4456c51dde7
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diff
changeset
|
406 size_t maxarglen = fts_maxarglen(argv); |
|
e4456c51dde7
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diff
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|
407 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
|
e4456c51dde7
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|
408 goto mem1; |
|
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diff
changeset
|
409 } |
| 5858 | 410 |
| 411 /* Allocate/initialize root's parent. */ | |
| 7151 | 412 if (*argv != NULL) { |
| 413 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
| 414 goto mem2; | |
| 415 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
| 416 } | |
| 5858 | 417 |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
418 /* The classic fts implementation would call fts_stat with |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
419 a new entry for each iteration of the loop below. |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
420 If the comparison function is not specified or if the |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
421 FTS_DEFER_STAT option is in effect, don't stat any entry |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
422 in this loop. This is an attempt to minimize the interval |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
423 between the initial stat/lstat/fstatat and the point at which |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
424 a directory argument is first opened. This matters for any |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
425 directory command line argument that resides on a file system |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
426 without genuine i-nodes. If you specify FTS_DEFER_STAT along |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
427 with a comparison function, that function must not access any |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
428 data via the fts_statp pointer. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
429 defer_stat = (compar == NULL || ISSET(FTS_DEFER_STAT)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
430 |
| 5858 | 431 /* Allocate/initialize root(s). */ |
| 432 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
| 5907 | 433 /* Don't allow zero-length file names. */ |
| 5858 | 434 if ((len = strlen(*argv)) == 0) { |
| 435 __set_errno (ENOENT); | |
| 436 goto mem3; | |
| 437 } | |
| 438 | |
| 439 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
| 440 goto mem3; | |
| 441 p->fts_level = FTS_ROOTLEVEL; | |
| 442 p->fts_parent = parent; | |
| 443 p->fts_accpath = p->fts_name; | |
|
7499
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
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7483
diff
changeset
|
444 /* Even when defer_stat is true, be sure to stat the first |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
parents:
7483
diff
changeset
|
445 command line argument, since fts_read (at least with |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
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7483
diff
changeset
|
446 FTS_XDEV) requires that. */ |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
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7483
diff
changeset
|
447 if (defer_stat && root != NULL) { |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
448 p->fts_info = FTS_NSOK; |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
449 fts_set_stat_required(p, true); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
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7408
diff
changeset
|
450 } else { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
451 p->fts_info = fts_stat(sp, p, false); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
452 } |
| 5858 | 453 |
| 454 /* | |
| 455 * If comparison routine supplied, traverse in sorted | |
| 456 * order; otherwise traverse in the order specified. | |
| 457 */ | |
| 458 if (compar) { | |
| 459 p->fts_link = root; | |
| 460 root = p; | |
| 461 } else { | |
| 462 p->fts_link = NULL; | |
| 463 if (root == NULL) | |
| 464 tmp = root = p; | |
| 465 else { | |
| 466 tmp->fts_link = p; | |
| 467 tmp = p; | |
| 468 } | |
| 469 } | |
| 470 } | |
| 471 if (compar && nitems > 1) | |
| 472 root = fts_sort(sp, root, nitems); | |
| 473 | |
| 474 /* | |
| 475 * Allocate a dummy pointer and make fts_read think that we've just | |
| 476 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
| 477 * so that everything about the "current" node is ignored. | |
| 478 */ | |
| 479 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
| 480 goto mem3; | |
| 481 sp->fts_cur->fts_link = root; | |
| 482 sp->fts_cur->fts_info = FTS_INIT; | |
| 5872 | 483 if (! setup_dir (sp)) |
|
7483
2433e5f6bfd0
* lib/fts.c (fts_open): Use consistent indentation.
Jim Meyering <jim@meyering.net>
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7482
diff
changeset
|
484 goto mem3; |
| 5858 | 485 |
| 486 /* | |
| 487 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
| 5907 | 488 * that we can get back here; this could be avoided for some file names, |
| 5858 | 489 * but almost certainly not worth the effort. Slashes, symbolic links, |
| 490 * and ".." are all fairly nasty problems. Note, if we can't get the | |
| 491 * descriptor we run anyway, just more slowly. | |
| 492 */ | |
| 7151 | 493 if (!ISSET(FTS_NOCHDIR) && !ISSET(FTS_CWDFD) |
| 494 && (sp->fts_rfd = diropen (sp, ".")) < 0) | |
| 5858 | 495 SET(FTS_NOCHDIR); |
| 496 | |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
497 i_ring_init (&sp->fts_fd_ring, -1); |
| 5858 | 498 return (sp); |
| 499 | |
| 500 mem3: fts_lfree(root); | |
| 501 free(parent); | |
| 502 mem2: free(sp->fts_path); | |
| 503 mem1: free(sp); | |
| 504 return (NULL); | |
| 505 } | |
| 506 | |
| 507 static void | |
| 508 internal_function | |
| 509 fts_load (FTS *sp, register FTSENT *p) | |
| 510 { | |
| 511 register size_t len; | |
| 512 register char *cp; | |
| 513 | |
| 514 /* | |
| 515 * Load the stream structure for the next traversal. Since we don't | |
| 516 * actually enter the directory until after the preorder visit, set | |
| 517 * the fts_accpath field specially so the chdir gets done to the right | |
| 518 * place and the user can access the first node. From fts_open it's | |
| 5907 | 519 * known that the file name will fit. |
| 5858 | 520 */ |
| 521 len = p->fts_pathlen = p->fts_namelen; | |
| 522 memmove(sp->fts_path, p->fts_name, len + 1); | |
| 523 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
| 524 len = strlen(++cp); | |
| 525 memmove(p->fts_name, cp, len + 1); | |
| 526 p->fts_namelen = len; | |
| 527 } | |
| 528 p->fts_accpath = p->fts_path = sp->fts_path; | |
| 529 } | |
| 530 | |
| 531 int | |
| 532 fts_close (FTS *sp) | |
| 533 { | |
| 534 register FTSENT *freep, *p; | |
| 535 int saved_errno = 0; | |
| 536 | |
| 537 /* | |
| 538 * This still works if we haven't read anything -- the dummy structure | |
| 539 * points to the root list, so we step through to the end of the root | |
| 540 * list which has a valid parent pointer. | |
| 541 */ | |
| 542 if (sp->fts_cur) { | |
| 543 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 544 freep = p; | |
| 545 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
| 546 free(freep); | |
| 547 } | |
| 548 free(p); | |
| 549 } | |
| 550 | |
| 5907 | 551 /* Free up child linked list, sort array, file name buffer. */ |
| 5858 | 552 if (sp->fts_child) |
| 553 fts_lfree(sp->fts_child); | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
554 free(sp->fts_array); |
| 5858 | 555 free(sp->fts_path); |
| 556 | |
| 7151 | 557 if (ISSET(FTS_CWDFD)) |
| 558 { | |
| 559 if (0 <= sp->fts_cwd_fd) | |
| 560 close (sp->fts_cwd_fd); | |
| 561 } | |
| 562 else if (!ISSET(FTS_NOCHDIR)) | |
| 563 { | |
| 564 /* Return to original directory, save errno if necessary. */ | |
| 565 if (fchdir(sp->fts_rfd)) | |
| 566 saved_errno = errno; | |
| 567 close(sp->fts_rfd); | |
| 568 } | |
| 5858 | 569 |
|
7639
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
570 fd_ring_clear (&sp->fts_fd_ring); |
| 5872 | 571 free_dir (sp); |
| 5858 | 572 |
| 573 /* Free up the stream pointer. */ | |
| 574 free(sp); | |
| 575 | |
| 576 /* Set errno and return. */ | |
| 577 if (saved_errno) { | |
| 578 __set_errno (saved_errno); | |
| 579 return (-1); | |
| 580 } | |
| 581 | |
| 582 return (0); | |
| 583 } | |
| 584 | |
| 585 /* | |
| 5907 | 586 * Special case of "/" at the end of the file name so that slashes aren't |
| 587 * appended which would cause file names to be written as "....//foo". | |
| 5858 | 588 */ |
| 589 #define NAPPEND(p) \ | |
| 590 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
| 591 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
| 592 | |
| 593 FTSENT * | |
| 594 fts_read (register FTS *sp) | |
| 595 { | |
| 596 register FTSENT *p, *tmp; | |
| 597 register unsigned short int instr; | |
| 598 register char *t; | |
| 599 | |
| 600 /* If finished or unrecoverable error, return NULL. */ | |
| 601 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
| 602 return (NULL); | |
| 603 | |
| 604 /* Set current node pointer. */ | |
| 605 p = sp->fts_cur; | |
| 606 | |
| 607 /* Save and zero out user instructions. */ | |
| 608 instr = p->fts_instr; | |
| 609 p->fts_instr = FTS_NOINSTR; | |
| 610 | |
| 611 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
| 612 if (instr == FTS_AGAIN) { | |
| 613 p->fts_info = fts_stat(sp, p, false); | |
| 614 return (p); | |
| 615 } | |
| 616 Dprintf (("fts_read: p=%s\n", | |
| 617 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
| 618 | |
| 619 /* | |
| 620 * Following a symlink -- SLNONE test allows application to see | |
| 621 * SLNONE and recover. If indirecting through a symlink, have | |
| 622 * keep a pointer to current location. If unable to get that | |
| 623 * pointer, follow fails. | |
| 624 */ | |
| 625 if (instr == FTS_FOLLOW && | |
| 626 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
| 627 p->fts_info = fts_stat(sp, p, true); | |
| 628 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 629 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 630 p->fts_errno = errno; |
| 631 p->fts_info = FTS_ERR; | |
| 632 } else | |
| 633 p->fts_flags |= FTS_SYMFOLLOW; | |
| 634 } | |
| 5872 | 635 goto check_for_dir; |
| 5858 | 636 } |
| 637 | |
| 638 /* Directory in pre-order. */ | |
| 639 if (p->fts_info == FTS_D) { | |
| 640 /* If skipped or crossed mount point, do post-order visit. */ | |
| 641 if (instr == FTS_SKIP || | |
| 642 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
| 643 if (p->fts_flags & FTS_SYMFOLLOW) | |
| 644 (void)close(p->fts_symfd); | |
| 645 if (sp->fts_child) { | |
| 646 fts_lfree(sp->fts_child); | |
| 647 sp->fts_child = NULL; | |
| 648 } | |
| 649 p->fts_info = FTS_DP; | |
| 650 LEAVE_DIR (sp, p, "1"); | |
| 651 return (p); | |
| 652 } | |
| 653 | |
| 654 /* Rebuild if only read the names and now traversing. */ | |
| 655 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
| 656 CLR(FTS_NAMEONLY); | |
| 657 fts_lfree(sp->fts_child); | |
| 658 sp->fts_child = NULL; | |
| 659 } | |
| 660 | |
| 661 /* | |
| 662 * Cd to the subdirectory. | |
| 663 * | |
| 664 * If have already read and now fail to chdir, whack the list | |
| 665 * to make the names come out right, and set the parent errno | |
| 666 * so the application will eventually get an error condition. | |
| 667 * Set the FTS_DONTCHDIR flag so that when we logically change | |
| 668 * directories back to the parent we don't do a chdir. | |
| 669 * | |
| 670 * If haven't read do so. If the read fails, fts_build sets | |
| 671 * FTS_STOP or the fts_info field of the node. | |
| 672 */ | |
| 673 if (sp->fts_child != NULL) { | |
| 674 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
| 675 p->fts_errno = errno; | |
| 676 p->fts_flags |= FTS_DONTCHDIR; | |
| 677 for (p = sp->fts_child; p != NULL; | |
| 678 p = p->fts_link) | |
| 679 p->fts_accpath = | |
| 680 p->fts_parent->fts_accpath; | |
| 681 } | |
| 682 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
| 683 if (ISSET(FTS_STOP)) | |
| 684 return (NULL); | |
| 685 /* If fts_build's call to fts_safe_changedir failed | |
| 686 because it was not able to fchdir into a | |
| 687 subdirectory, tell the caller. */ | |
|
9129
79b0e6e0f7ba
* lib/fts.c (fts_read): Upon failure to chdir into a subdirectory,
Jim Meyering <jim@meyering.net>
parents:
7853
diff
changeset
|
688 if (p->fts_errno && p->fts_info != FTS_DNR) |
| 5858 | 689 p->fts_info = FTS_ERR; |
| 690 LEAVE_DIR (sp, p, "2"); | |
| 691 return (p); | |
| 692 } | |
| 693 p = sp->fts_child; | |
| 694 sp->fts_child = NULL; | |
| 695 goto name; | |
| 696 } | |
| 697 | |
| 698 /* Move to the next node on this level. */ | |
| 699 next: tmp = p; | |
| 700 if ((p = p->fts_link) != NULL) { | |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
701 sp->fts_cur = p; |
| 5858 | 702 free(tmp); |
| 703 | |
| 704 /* | |
| 705 * If reached the top, return to the original directory (or | |
| 5907 | 706 * the root of the tree), and load the file names for the next |
| 707 * root. | |
| 5858 | 708 */ |
| 709 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 710 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 711 SET(FTS_STOP); |
| 712 return (NULL); | |
| 713 } | |
| 714 fts_load(sp, p); | |
| 5872 | 715 goto check_for_dir; |
| 5858 | 716 } |
| 717 | |
| 718 /* | |
| 719 * User may have called fts_set on the node. If skipped, | |
| 720 * ignore. If followed, get a file descriptor so we can | |
| 721 * get back if necessary. | |
| 722 */ | |
| 723 if (p->fts_instr == FTS_SKIP) | |
| 724 goto next; | |
| 725 if (p->fts_instr == FTS_FOLLOW) { | |
| 726 p->fts_info = fts_stat(sp, p, true); | |
| 727 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 728 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 729 p->fts_errno = errno; |
| 730 p->fts_info = FTS_ERR; | |
| 731 } else | |
| 732 p->fts_flags |= FTS_SYMFOLLOW; | |
| 733 } | |
| 734 p->fts_instr = FTS_NOINSTR; | |
| 735 } | |
| 736 | |
| 737 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
| 738 *t++ = '/'; | |
| 739 memmove(t, p->fts_name, p->fts_namelen + 1); | |
| 5872 | 740 check_for_dir: |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
741 sp->fts_cur = p; |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
742 if (p->fts_info == FTS_NSOK) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
743 { |
|
7786
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
744 if (p->fts_statp->st_size == FTS_STAT_REQUIRED) |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
745 p->fts_info = fts_stat(sp, p, false); |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
746 else |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
747 fts_assert (p->fts_statp->st_size == FTS_NO_STAT_REQUIRED); |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
748 } |
|
7707
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
749 |
| 5858 | 750 if (p->fts_info == FTS_D) |
| 5872 | 751 { |
|
7707
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
752 /* Now that P->fts_statp is guaranteed to be valid, |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
753 if this is a command-line directory, record its |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
754 device number, to be used for FTS_XDEV. */ |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
755 if (p->fts_level == FTS_ROOTLEVEL) |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
756 sp->fts_dev = p->fts_statp->st_dev; |
|
7635
7f65b3a0e7a4
* lib/fts.c [FTS_DEBUG]: Don't try to print a pointer via %s.
Jim Meyering <jim@meyering.net>
parents:
7623
diff
changeset
|
757 Dprintf ((" entering: %s\n", p->fts_path)); |
| 5872 | 758 if (! enter_dir (sp, p)) |
| 759 { | |
| 760 __set_errno (ENOMEM); | |
| 761 return NULL; | |
| 762 } | |
| 763 } | |
| 764 return p; | |
| 5858 | 765 } |
| 766 | |
| 767 /* Move up to the parent node. */ | |
| 768 p = tmp->fts_parent; | |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
769 sp->fts_cur = p; |
| 5858 | 770 free(tmp); |
| 771 | |
| 772 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
| 773 /* | |
| 774 * Done; free everything up and set errno to 0 so the user | |
| 775 * can distinguish between error and EOF. | |
| 776 */ | |
| 777 free(p); | |
| 778 __set_errno (0); | |
| 779 return (sp->fts_cur = NULL); | |
| 780 } | |
| 781 | |
|
7785
3246679850d5
Slight readability improvement: use an assert-like macro
Jim Meyering <jim@meyering.net>
parents:
7707
diff
changeset
|
782 fts_assert (p->fts_info != FTS_NSOK); |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
783 |
| 5907 | 784 /* NUL terminate the file name. */ |
| 5858 | 785 sp->fts_path[p->fts_pathlen] = '\0'; |
| 786 | |
| 787 /* | |
| 7151 | 788 * Return to the parent directory. If at a root node, restore |
| 789 * the initial working directory. If we came through a symlink, | |
| 790 * go back through the file descriptor. Otherwise, move up | |
| 791 * one level, via "..". | |
| 5858 | 792 */ |
| 793 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 794 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 795 p->fts_errno = errno; |
| 796 SET(FTS_STOP); | |
| 797 } | |
| 798 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
| 799 if (FCHDIR(sp, p->fts_symfd)) { | |
| 7151 | 800 int saved_errno = errno; |
| 5858 | 801 (void)close(p->fts_symfd); |
| 802 __set_errno (saved_errno); | |
| 803 p->fts_errno = errno; | |
| 804 SET(FTS_STOP); | |
| 805 } | |
| 806 (void)close(p->fts_symfd); | |
| 807 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
| 808 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
| 809 p->fts_errno = errno; | |
| 810 SET(FTS_STOP); | |
| 811 } | |
| 812 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
| 813 if (p->fts_errno == 0) | |
| 814 LEAVE_DIR (sp, p, "3"); | |
| 815 return ISSET(FTS_STOP) ? NULL : p; | |
| 816 } | |
| 817 | |
| 818 /* | |
| 819 * Fts_set takes the stream as an argument although it's not used in this | |
| 820 * implementation; it would be necessary if anyone wanted to add global | |
| 821 * semantics to fts using fts_set. An error return is allowed for similar | |
| 822 * reasons. | |
| 823 */ | |
| 824 /* ARGSUSED */ | |
| 825 int | |
| 826 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
| 827 { | |
| 828 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
| 829 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
| 830 __set_errno (EINVAL); | |
| 831 return (1); | |
| 832 } | |
| 833 p->fts_instr = instr; | |
| 834 return (0); | |
| 835 } | |
| 836 | |
| 837 FTSENT * | |
| 838 fts_children (register FTS *sp, int instr) | |
| 839 { | |
| 840 register FTSENT *p; | |
| 841 int fd; | |
| 842 | |
| 843 if (instr != 0 && instr != FTS_NAMEONLY) { | |
| 844 __set_errno (EINVAL); | |
| 845 return (NULL); | |
| 846 } | |
| 847 | |
| 848 /* Set current node pointer. */ | |
| 849 p = sp->fts_cur; | |
| 850 | |
| 851 /* | |
| 852 * Errno set to 0 so user can distinguish empty directory from | |
| 853 * an error. | |
| 854 */ | |
| 855 __set_errno (0); | |
| 856 | |
| 857 /* Fatal errors stop here. */ | |
| 858 if (ISSET(FTS_STOP)) | |
| 859 return (NULL); | |
| 860 | |
| 861 /* Return logical hierarchy of user's arguments. */ | |
| 862 if (p->fts_info == FTS_INIT) | |
| 863 return (p->fts_link); | |
| 864 | |
| 865 /* | |
| 866 * If not a directory being visited in pre-order, stop here. Could | |
| 867 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
| 868 * same effect is available with FTS_AGAIN. | |
| 869 */ | |
| 870 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
| 871 return (NULL); | |
| 872 | |
| 873 /* Free up any previous child list. */ | |
| 874 if (sp->fts_child != NULL) | |
| 875 fts_lfree(sp->fts_child); | |
| 876 | |
| 877 if (instr == FTS_NAMEONLY) { | |
| 878 SET(FTS_NAMEONLY); | |
| 879 instr = BNAMES; | |
| 880 } else | |
| 881 instr = BCHILD; | |
| 882 | |
| 883 /* | |
| 5907 | 884 * If using chdir on a relative file name and called BEFORE fts_read |
| 885 * does its chdir to the root of a traversal, we can lose -- we need to | |
| 5858 | 886 * chdir into the subdirectory, and we don't know where the current |
| 887 * directory is, so we can't get back so that the upcoming chdir by | |
| 888 * fts_read will work. | |
| 889 */ | |
| 890 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
| 891 ISSET(FTS_NOCHDIR)) | |
| 892 return (sp->fts_child = fts_build(sp, instr)); | |
| 893 | |
| 7151 | 894 if ((fd = diropen (sp, ".")) < 0) |
| 5858 | 895 return (sp->fts_child = NULL); |
| 896 sp->fts_child = fts_build(sp, instr); | |
| 7151 | 897 if (ISSET(FTS_CWDFD)) |
| 898 { | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
899 cwd_advance_fd (sp, fd, true); |
| 7151 | 900 } |
| 901 else | |
| 902 { | |
| 903 if (fchdir(fd)) | |
| 904 { | |
|
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
905 int saved_errno = errno; |
| 7151 | 906 close (fd); |
|
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
907 __set_errno (saved_errno); |
| 7151 | 908 return NULL; |
| 909 } | |
| 910 close (fd); | |
| 911 } | |
| 5858 | 912 return (sp->fts_child); |
| 913 } | |
| 914 | |
| 915 /* | |
| 916 * This is the tricky part -- do not casually change *anything* in here. The | |
| 917 * idea is to build the linked list of entries that are used by fts_children | |
| 918 * and fts_read. There are lots of special cases. | |
| 919 * | |
| 920 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
| 921 * set and it's a physical walk (so that symbolic links can't be directories), | |
| 922 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
| 923 * of the file is in the directory entry. Otherwise, we assume that the number | |
| 924 * of subdirectories in a node is equal to the number of links to the parent. | |
| 925 * The former skips all stat calls. The latter skips stat calls in any leaf | |
| 926 * directories and for any files after the subdirectories in the directory have | |
| 927 * been found, cutting the stat calls by about 2/3. | |
| 928 */ | |
| 929 static FTSENT * | |
| 930 internal_function | |
| 931 fts_build (register FTS *sp, int type) | |
| 932 { | |
| 933 register struct dirent *dp; | |
| 934 register FTSENT *p, *head; | |
| 935 register size_t nitems; | |
| 936 FTSENT *cur, *tail; | |
| 937 DIR *dirp; | |
| 938 void *oldaddr; | |
| 939 int saved_errno; | |
| 940 bool descend; | |
| 941 bool doadjust; | |
| 942 ptrdiff_t level; | |
| 943 nlink_t nlinks; | |
| 944 bool nostat; | |
| 945 size_t len, maxlen, new_len; | |
| 946 char *cp; | |
| 947 | |
| 948 /* Set current node pointer. */ | |
| 949 cur = sp->fts_cur; | |
| 950 | |
| 951 /* | |
| 952 * Open the directory for reading. If this fails, we're done. | |
| 953 * If being called from fts_read, set the fts_info field. | |
| 954 */ | |
| 955 #if defined FTS_WHITEOUT && 0 | |
| 956 if (ISSET(FTS_WHITEOUT)) | |
| 957 oflag = DTF_NODUP|DTF_REWIND; | |
| 958 else | |
| 959 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
| 960 #else | |
| 7151 | 961 # define __opendir2(file, flag) \ |
| 962 ( ! ISSET(FTS_NOCHDIR) && ISSET(FTS_CWDFD) \ | |
| 963 ? opendirat(sp->fts_cwd_fd, file) \ | |
| 964 : opendir(file)) | |
| 5858 | 965 #endif |
| 966 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
| 967 if (type == BREAD) { | |
| 968 cur->fts_info = FTS_DNR; | |
| 969 cur->fts_errno = errno; | |
| 970 } | |
| 971 return (NULL); | |
| 972 } | |
|
7482
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Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
973 /* Rather than calling fts_stat for each and every entry encountered |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
974 in the readdir loop (below), stat each directory only right after |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
975 opening it. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
976 if (cur->fts_info == FTS_NSOK) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
977 cur->fts_info = fts_stat(sp, cur, false); |
| 5858 | 978 |
| 979 /* | |
| 980 * Nlinks is the number of possible entries of type directory in the | |
| 981 * directory if we're cheating on stat calls, 0 if we're not doing | |
| 982 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
| 983 */ | |
| 984 if (type == BNAMES) { | |
| 985 nlinks = 0; | |
| 986 /* Be quiet about nostat, GCC. */ | |
| 987 nostat = false; | |
| 988 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
| 989 nlinks = (cur->fts_statp->st_nlink | |
| 990 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
| 991 nostat = true; | |
| 992 } else { | |
| 993 nlinks = -1; | |
| 994 nostat = false; | |
| 995 } | |
| 996 | |
| 997 /* | |
| 998 * If we're going to need to stat anything or we want to descend | |
| 999 * and stay in the directory, chdir. If this fails we keep going, | |
| 1000 * but set a flag so we don't chdir after the post-order visit. | |
| 1001 * We won't be able to stat anything, but we can still return the | |
| 1002 * names themselves. Note, that since fts_read won't be able to | |
| 5907 | 1003 * chdir into the directory, it will have to return different file |
| 5858 | 1004 * names than before, i.e. "a/b" instead of "b". Since the node |
| 1005 * has already been visited in pre-order, have to wait until the | |
| 1006 * post-order visit to return the error. There is a special case | |
| 1007 * here, if there was nothing to stat then it's not an error to | |
| 1008 * not be able to stat. This is all fairly nasty. If a program | |
| 1009 * needed sorted entries or stat information, they had better be | |
| 1010 * checking FTS_NS on the returned nodes. | |
| 1011 */ | |
| 1012 if (nlinks || type == BREAD) { | |
| 7151 | 1013 int dir_fd = dirfd(dirp); |
| 1014 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) | |
| 1015 dir_fd = dup (dir_fd); | |
| 1016 if (dir_fd < 0 || fts_safe_changedir(sp, cur, dir_fd, NULL)) { | |
| 5858 | 1017 if (nlinks && type == BREAD) |
| 1018 cur->fts_errno = errno; | |
| 1019 cur->fts_flags |= FTS_DONTCHDIR; | |
| 1020 descend = false; | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1021 closedir(dirp); |
| 7151 | 1022 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) |
| 1023 close (dir_fd); | |
| 5858 | 1024 dirp = NULL; |
| 1025 } else | |
| 1026 descend = true; | |
| 1027 } else | |
| 1028 descend = false; | |
| 1029 | |
| 1030 /* | |
| 1031 * Figure out the max file name length that can be stored in the | |
| 5907 | 1032 * current buffer -- the inner loop allocates more space as necessary. |
| 5858 | 1033 * We really wouldn't have to do the maxlen calculations here, we |
| 5907 | 1034 * could do them in fts_read before returning the name, but it's a |
| 5858 | 1035 * lot easier here since the length is part of the dirent structure. |
| 1036 * | |
| 1037 * If not changing directories set a pointer so that can just append | |
| 5907 | 1038 * each new component into the file name. |
| 5858 | 1039 */ |
| 1040 len = NAPPEND(cur); | |
| 1041 if (ISSET(FTS_NOCHDIR)) { | |
| 1042 cp = sp->fts_path + len; | |
| 1043 *cp++ = '/'; | |
| 1044 } else { | |
| 1045 /* GCC, you're too verbose. */ | |
| 1046 cp = NULL; | |
| 1047 } | |
| 1048 len++; | |
| 1049 maxlen = sp->fts_pathlen - len; | |
| 1050 | |
| 1051 level = cur->fts_level + 1; | |
| 1052 | |
| 1053 /* Read the directory, attaching each entry to the `link' pointer. */ | |
| 1054 doadjust = false; | |
| 1055 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
|
7555
0da62e3fa6c7
(fts_build): Move variable declaration, for C89 compliance.
Bruno Haible <bruno@clisp.org>
parents:
7499
diff
changeset
|
1056 bool is_dir; |
|
0da62e3fa6c7
(fts_build): Move variable declaration, for C89 compliance.
Bruno Haible <bruno@clisp.org>
parents:
7499
diff
changeset
|
1057 |
| 5858 | 1058 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) |
| 1059 continue; | |
| 1060 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1061 if ((p = fts_alloc (sp, dp->d_name, |
|
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1062 _D_EXACT_NAMLEN (dp))) == NULL) |
| 5858 | 1063 goto mem1; |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1064 if (_D_EXACT_NAMLEN (dp) >= maxlen) { |
|
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1065 /* include space for NUL */ |
| 5858 | 1066 oldaddr = sp->fts_path; |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1067 if (! fts_palloc(sp, _D_EXACT_NAMLEN (dp) + len + 1)) { |
| 5858 | 1068 /* |
| 5907 | 1069 * No more memory. Save |
| 5858 | 1070 * errno, free up the current structure and the |
| 1071 * structures already allocated. | |
| 1072 */ | |
| 1073 mem1: saved_errno = errno; | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
1074 free(p); |
| 5858 | 1075 fts_lfree(head); |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1076 closedir(dirp); |
| 5858 | 1077 cur->fts_info = FTS_ERR; |
| 1078 SET(FTS_STOP); | |
| 1079 __set_errno (saved_errno); | |
| 1080 return (NULL); | |
| 1081 } | |
| 1082 /* Did realloc() change the pointer? */ | |
| 1083 if (oldaddr != sp->fts_path) { | |
| 1084 doadjust = true; | |
| 1085 if (ISSET(FTS_NOCHDIR)) | |
| 1086 cp = sp->fts_path + len; | |
| 1087 } | |
| 1088 maxlen = sp->fts_pathlen - len; | |
| 1089 } | |
| 1090 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1091 new_len = len + _D_EXACT_NAMLEN (dp); |
| 5858 | 1092 if (new_len < len) { |
| 1093 /* | |
| 1094 * In the unlikely even that we would end up | |
| 5907 | 1095 * with a file name longer than SIZE_MAX, free up |
| 5858 | 1096 * the current structure and the structures already |
| 1097 * allocated, then error out with ENAMETOOLONG. | |
| 1098 */ | |
| 1099 free(p); | |
| 1100 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1101 closedir(dirp); |
| 5858 | 1102 cur->fts_info = FTS_ERR; |
| 1103 SET(FTS_STOP); | |
| 1104 __set_errno (ENAMETOOLONG); | |
| 1105 return (NULL); | |
| 1106 } | |
| 1107 p->fts_level = level; | |
| 1108 p->fts_parent = sp->fts_cur; | |
| 1109 p->fts_pathlen = new_len; | |
| 1110 | |
| 1111 #if defined FTS_WHITEOUT && 0 | |
| 1112 if (dp->d_type == DT_WHT) | |
| 1113 p->fts_flags |= FTS_ISW; | |
| 1114 #endif | |
| 1115 | |
| 7151 | 1116 /* Build a file name for fts_stat to stat. */ |
| 1117 if (ISSET(FTS_NOCHDIR)) { | |
| 1118 p->fts_accpath = p->fts_path; | |
| 1119 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
| 1120 } else | |
| 1121 p->fts_accpath = p->fts_name; | |
|
7482
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Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1122 |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1123 if (sp->fts_compar == NULL || ISSET(FTS_DEFER_STAT)) { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1124 /* Record what fts_read will have to do with this |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1125 entry. In many cases, it will simply fts_stat it, |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1126 but we can take advantage of any d_type information |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1127 to optimize away the unnecessary stat calls. I.e., |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1128 if FTS_NOSTAT is in effect and we're not following |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1129 symlinks (FTS_PHYSICAL) and d_type indicates this |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1130 is *not* a directory, then we won't have to stat it |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1131 at all. If it *is* a directory, then (currently) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1132 we stat it regardless, in order to get device and |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1133 inode numbers. Some day we might optimize that |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1134 away, too, for directories where d_ino is known to |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1135 be valid. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1136 bool skip_stat = (ISSET(FTS_PHYSICAL) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1137 && ISSET(FTS_NOSTAT) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1138 && DT_IS_KNOWN(dp) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1139 && ! DT_MUST_BE(dp, DT_DIR)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1140 p->fts_info = FTS_NSOK; |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1141 fts_set_stat_required(p, !skip_stat); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1142 is_dir = (ISSET(FTS_PHYSICAL) && ISSET(FTS_NOSTAT) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1143 && DT_MUST_BE(dp, DT_DIR)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1144 } else { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1145 p->fts_info = fts_stat(sp, p, false); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1146 is_dir = (p->fts_info == FTS_D |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1147 || p->fts_info == FTS_DC |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1148 || p->fts_info == FTS_DOT); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1149 } |
| 5858 | 1150 |
| 7151 | 1151 /* Decrement link count if applicable. */ |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1152 if (nlinks > 0 && is_dir) |
| 7151 | 1153 nlinks -= nostat; |
| 5858 | 1154 |
| 1155 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
| 1156 p->fts_link = NULL; | |
| 1157 if (head == NULL) | |
| 1158 head = tail = p; | |
| 1159 else { | |
| 1160 tail->fts_link = p; | |
| 1161 tail = p; | |
| 1162 } | |
| 1163 ++nitems; | |
| 1164 } | |
| 1165 if (dirp) | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1166 closedir(dirp); |
| 5858 | 1167 |
| 1168 /* | |
| 5907 | 1169 * If realloc() changed the address of the file name, adjust the |
| 5858 | 1170 * addresses for the rest of the tree and the dir list. |
| 1171 */ | |
| 1172 if (doadjust) | |
| 1173 fts_padjust(sp, head); | |
| 1174 | |
| 1175 /* | |
| 5907 | 1176 * If not changing directories, reset the file name back to original |
| 5858 | 1177 * state. |
| 1178 */ | |
| 1179 if (ISSET(FTS_NOCHDIR)) { | |
| 1180 if (len == sp->fts_pathlen || nitems == 0) | |
| 1181 --cp; | |
| 1182 *cp = '\0'; | |
| 1183 } | |
| 1184 | |
| 1185 /* | |
| 1186 * If descended after called from fts_children or after called from | |
| 1187 * fts_read and nothing found, get back. At the root level we use | |
| 5907 | 1188 * the saved fd; if one of fts_open()'s arguments is a relative name |
| 5858 | 1189 * to an empty directory, we wind up here with no other way back. If |
| 1190 * can't get back, we're done. | |
| 1191 */ | |
| 1192 if (descend && (type == BCHILD || !nitems) && | |
| 7151 | 1193 (cur->fts_level == FTS_ROOTLEVEL |
| 1194 ? RESTORE_INITIAL_CWD(sp) | |
| 1195 : fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
| 5858 | 1196 cur->fts_info = FTS_ERR; |
| 1197 SET(FTS_STOP); | |
| 7151 | 1198 fts_lfree(head); |
| 5858 | 1199 return (NULL); |
| 1200 } | |
| 1201 | |
| 1202 /* If didn't find anything, return NULL. */ | |
| 1203 if (!nitems) { | |
| 1204 if (type == BREAD) | |
| 1205 cur->fts_info = FTS_DP; | |
| 7151 | 1206 fts_lfree(head); |
| 5858 | 1207 return (NULL); |
| 1208 } | |
| 1209 | |
| 1210 /* Sort the entries. */ | |
| 1211 if (sp->fts_compar && nitems > 1) | |
| 1212 head = fts_sort(sp, head, nitems); | |
| 1213 return (head); | |
| 1214 } | |
| 1215 | |
| 1216 #if FTS_DEBUG | |
| 1217 | |
| 1218 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
| 1219 current hierarchy. There should be a directory with dev/inode | |
| 1220 matching those of AD. If not, print a lot of diagnostics. */ | |
| 1221 static void | |
| 1222 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
| 1223 { | |
| 1224 FTSENT const *ent; | |
| 1225 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1226 { | |
| 1227 if (ad->ino == ent->fts_statp->st_ino | |
| 1228 && ad->dev == ent->fts_statp->st_dev) | |
| 1229 return; | |
| 1230 } | |
| 1231 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
| 1232 printf ("active dirs:\n"); | |
| 1233 for (ent = e_curr; | |
| 1234 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1235 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
| 1236 ad->fts_ent->fts_accpath, | |
| 1237 (uintmax_t) ad->dev, | |
| 1238 (uintmax_t) ad->ino, | |
| 1239 ent->fts_accpath, | |
| 1240 (uintmax_t) ent->fts_statp->st_dev, | |
| 1241 (uintmax_t) ent->fts_statp->st_ino); | |
| 1242 } | |
| 1243 | |
| 1244 void | |
| 1245 fts_cross_check (FTS const *sp) | |
| 1246 { | |
| 1247 FTSENT const *ent = sp->fts_cur; | |
| 1248 FTSENT const *t; | |
| 1249 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
| 1250 return; | |
| 1251 | |
| 1252 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
| 1253 /* Make sure every parent dir is in the tree. */ | |
| 1254 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1255 { | |
| 1256 struct Active_dir ad; | |
| 1257 ad.ino = t->fts_statp->st_ino; | |
| 1258 ad.dev = t->fts_statp->st_dev; | |
|
6034
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1259 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
| 5858 | 1260 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
| 1261 } | |
| 1262 | |
| 1263 /* Make sure every dir in the tree is an active dir. | |
| 1264 But ENT is not necessarily a directory. If so, just skip this part. */ | |
| 1265 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
| 1266 && (ent->fts_info == FTS_DP | |
| 1267 || ent->fts_info == FTS_D)) | |
| 1268 { | |
| 1269 struct Active_dir *ad; | |
|
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1270 for (ad = hash_get_first (sp->fts_cycle.ht); ad != NULL; |
|
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|
1271 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
| 5858 | 1272 { |
| 1273 find_matching_ancestor (ent, ad); | |
| 1274 } | |
| 1275 } | |
| 1276 } | |
|
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1277 |
|
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1278 static bool |
|
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1279 same_fd (int fd1, int fd2) |
|
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1280 { |
|
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1281 struct stat sb1, sb2; |
|
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1282 return (fstat (fd1, &sb1) == 0 |
|
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1283 && fstat (fd2, &sb2) == 0 |
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1284 && SAME_INODE (sb1, sb2)); |
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1285 } |
|
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1286 |
|
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1287 static void |
|
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1288 fd_ring_print (FTS const *sp, FILE *stream, char const *msg) |
|
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1289 { |
|
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1290 I_ring const *fd_ring = &sp->fts_fd_ring; |
|
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1291 unsigned int i = fd_ring->fts_front; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1292 char *cwd = getcwdat (sp->fts_cwd_fd, NULL, 0); |
|
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1293 fprintf (stream, "=== %s ========== %s\n", msg, cwd); |
|
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1294 free (cwd); |
|
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1295 if (i_ring_empty (fd_ring)) |
|
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1296 return; |
|
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1297 |
|
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1298 while (true) |
|
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1299 { |
|
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1300 int fd = fd_ring->fts_fd_ring[i]; |
|
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1301 if (fd < 0) |
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1302 fprintf (stream, "%d: %d:\n", i, fd); |
|
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1303 else |
|
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1304 { |
|
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1305 char *wd = getcwdat (fd, NULL, 0); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1306 fprintf (stream, "%d: %d: %s\n", i, fd, wd); |
|
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1307 free (wd); |
|
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|
1308 } |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1309 if (i == fd_ring->fts_back) |
|
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1310 break; |
|
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1311 i = (i + I_RING_SIZE - 1) % I_RING_SIZE; |
|
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1312 } |
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1313 } |
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1314 |
|
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1315 /* Ensure that each file descriptor on the fd_ring matches a |
|
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1316 parent, grandparent, etc. of the current working directory. */ |
|
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1317 static void |
|
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1318 fd_ring_check (FTS const *sp) |
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1319 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1320 if (!fts_debug) |
|
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1321 return; |
|
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1322 |
|
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1323 /* Make a writable copy. */ |
|
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1324 I_ring fd_w = sp->fts_fd_ring; |
|
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1325 |
|
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1326 int cwd_fd = sp->fts_cwd_fd; |
|
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1327 cwd_fd = dup (cwd_fd); |
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1328 char *dot = getcwdat (cwd_fd, NULL, 0); |
|
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1329 error (0, 0, "===== check ===== cwd: %s", dot); |
|
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1330 free (dot); |
|
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1331 while ( ! i_ring_empty (&fd_w)) |
|
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1332 { |
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1333 int fd = i_ring_pop (&fd_w); |
|
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1334 if (0 <= fd) |
|
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1335 { |
|
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1336 int parent_fd = openat (cwd_fd, "..", O_RDONLY); |
|
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1337 if (parent_fd < 0) |
|
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1338 { |
|
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1339 // Warn? |
|
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1340 break; |
|
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1341 } |
|
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1342 if (!same_fd (fd, parent_fd)) |
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1343 { |
|
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1344 char *cwd = getcwdat (fd, NULL, 0); |
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1345 error (0, errno, "ring : %s", cwd); |
|
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1346 char *c2 = getcwdat (parent_fd, NULL, 0); |
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1347 error (0, errno, "parent: %s", c2); |
|
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1348 free (cwd); |
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1349 free (c2); |
|
7785
3246679850d5
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1350 fts_assert (0); |
|
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1351 } |
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1352 close (cwd_fd); |
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1353 cwd_fd = parent_fd; |
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1354 } |
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1355 } |
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1356 close (cwd_fd); |
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1357 } |
| 5858 | 1358 #endif |
| 1359 | |
| 1360 static unsigned short int | |
| 1361 internal_function | |
| 1362 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
| 1363 { | |
| 1364 struct stat *sbp = p->fts_statp; | |
| 1365 int saved_errno; | |
| 1366 | |
|
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1367 if (p->fts_level == FTS_ROOTLEVEL && ISSET(FTS_COMFOLLOW)) |
|
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1368 follow = true; |
|
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Big performance improvement for fts-based tools that use FTS_NOSTAT.
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|
1369 |
| 5858 | 1370 #if defined FTS_WHITEOUT && 0 |
| 1371 /* check for whiteout */ | |
| 1372 if (p->fts_flags & FTS_ISW) { | |
| 1373 memset(sbp, '\0', sizeof (*sbp)); | |
| 1374 sbp->st_mode = S_IFWHT; | |
| 1375 return (FTS_W); | |
| 1376 } | |
| 1377 #endif | |
| 1378 | |
| 1379 /* | |
| 1380 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
| 1381 * a stat(2). If that fails, check for a non-existent symlink. If | |
| 1382 * fail, set the errno from the stat call. | |
| 1383 */ | |
| 1384 if (ISSET(FTS_LOGICAL) || follow) { | |
| 1385 if (stat(p->fts_accpath, sbp)) { | |
| 1386 saved_errno = errno; | |
|
6611
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|
1387 if (errno == ENOENT |
|
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1388 && lstat(p->fts_accpath, sbp) == 0) { |
| 5858 | 1389 __set_errno (0); |
| 1390 return (FTS_SLNONE); | |
| 1391 } | |
| 1392 p->fts_errno = saved_errno; | |
| 1393 goto err; | |
| 1394 } | |
| 7151 | 1395 } else if (fstatat(sp->fts_cwd_fd, p->fts_accpath, sbp, |
| 1396 AT_SYMLINK_NOFOLLOW)) { | |
| 5858 | 1397 p->fts_errno = errno; |
| 1398 err: memset(sbp, 0, sizeof(struct stat)); | |
| 1399 return (FTS_NS); | |
| 1400 } | |
| 1401 | |
| 1402 if (S_ISDIR(sbp->st_mode)) { | |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1403 if (ISDOT(p->fts_name)) { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1404 /* Command-line "." and ".." are real directories. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1405 return (p->fts_level == FTS_ROOTLEVEL ? FTS_D : FTS_DOT); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1406 } |
| 5872 | 1407 |
|
7797
10432bdf90d3
2007-01-08 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
parents:
7786
diff
changeset
|
1408 #if !GNULIB_FTS |
| 5872 | 1409 { |
| 1410 /* | |
| 1411 * Cycle detection is done by brute force when the directory | |
| 1412 * is first encountered. If the tree gets deep enough or the | |
| 1413 * number of symbolic links to directories is high enough, | |
| 1414 * something faster might be worthwhile. | |
| 1415 */ | |
| 1416 FTSENT *t; | |
| 1417 | |
| 1418 for (t = p->fts_parent; | |
| 1419 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1420 if (sbp->st_ino == t->fts_statp->st_ino | |
| 1421 && sbp->st_dev == t->fts_statp->st_dev) | |
| 1422 { | |
| 1423 p->fts_cycle = t; | |
| 1424 return (FTS_DC); | |
| 1425 } | |
| 1426 } | |
| 1427 #endif | |
| 1428 | |
| 5858 | 1429 return (FTS_D); |
| 1430 } | |
| 1431 if (S_ISLNK(sbp->st_mode)) | |
| 1432 return (FTS_SL); | |
| 1433 if (S_ISREG(sbp->st_mode)) | |
| 1434 return (FTS_F); | |
| 1435 return (FTS_DEFAULT); | |
| 1436 } | |
| 1437 | |
| 1438 static int | |
| 1439 fts_compar (void const *a, void const *b) | |
| 1440 { | |
| 1441 /* Convert A and B to the correct types, to pacify the compiler, and | |
| 1442 for portability to bizarre hosts where "void const *" and "FTSENT | |
| 1443 const **" differ in runtime representation. The comparison | |
| 1444 function cannot modify *a and *b, but there is no compile-time | |
| 1445 check for this. */ | |
| 1446 FTSENT const **pa = (FTSENT const **) a; | |
| 1447 FTSENT const **pb = (FTSENT const **) b; | |
| 1448 return pa[0]->fts_fts->fts_compar (pa, pb); | |
| 1449 } | |
| 1450 | |
| 1451 static FTSENT * | |
| 1452 internal_function | |
| 1453 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
| 1454 { | |
| 1455 register FTSENT **ap, *p; | |
| 1456 | |
| 1457 /* On most modern hosts, void * and FTSENT ** have the same | |
| 1458 run-time representation, and one can convert sp->fts_compar to | |
| 1459 the type qsort expects without problem. Use the heuristic that | |
| 1460 this is OK if the two pointer types are the same size, and if | |
| 1461 converting FTSENT ** to long int is the same as converting | |
| 1462 FTSENT ** to void * and then to long int. This heuristic isn't | |
| 1463 valid in general but we don't know of any counterexamples. */ | |
| 1464 FTSENT *dummy; | |
| 1465 int (*compare) (void const *, void const *) = | |
| 1466 ((sizeof &dummy == sizeof (void *) | |
| 1467 && (long int) &dummy == (long int) (void *) &dummy) | |
| 1468 ? (int (*) (void const *, void const *)) sp->fts_compar | |
| 1469 : fts_compar); | |
| 1470 | |
| 1471 /* | |
| 1472 * Construct an array of pointers to the structures and call qsort(3). | |
| 1473 * Reassemble the array in the order returned by qsort. If unable to | |
| 1474 * sort for memory reasons, return the directory entries in their | |
| 1475 * current order. Allocate enough space for the current needs plus | |
| 1476 * 40 so don't realloc one entry at a time. | |
| 1477 */ | |
| 1478 if (nitems > sp->fts_nitems) { | |
| 1479 struct _ftsent **a; | |
| 1480 | |
| 1481 sp->fts_nitems = nitems + 40; | |
| 1482 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
| 1483 || ! (a = realloc (sp->fts_array, | |
| 1484 sp->fts_nitems * sizeof *a))) { | |
| 1485 free(sp->fts_array); | |
| 1486 sp->fts_array = NULL; | |
| 1487 sp->fts_nitems = 0; | |
| 1488 return (head); | |
| 1489 } | |
| 1490 sp->fts_array = a; | |
| 1491 } | |
| 1492 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
| 1493 *ap++ = p; | |
| 1494 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
| 1495 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
| 1496 ap[0]->fts_link = ap[1]; | |
| 1497 ap[0]->fts_link = NULL; | |
| 1498 return (head); | |
| 1499 } | |
| 1500 | |
| 1501 static FTSENT * | |
| 1502 internal_function | |
| 1503 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
| 1504 { | |
| 1505 register FTSENT *p; | |
| 1506 size_t len; | |
| 1507 | |
| 1508 /* | |
| 1509 * The file name is a variable length array. Allocate the FTSENT | |
| 1510 * structure and the file name in one chunk. | |
| 1511 */ | |
| 1512 len = sizeof(FTSENT) + namelen; | |
| 1513 if ((p = malloc(len)) == NULL) | |
| 1514 return (NULL); | |
| 1515 | |
| 1516 /* Copy the name and guarantee NUL termination. */ | |
| 1517 memmove(p->fts_name, name, namelen); | |
| 1518 p->fts_name[namelen] = '\0'; | |
| 1519 | |
| 1520 p->fts_namelen = namelen; | |
| 1521 p->fts_fts = sp; | |
| 1522 p->fts_path = sp->fts_path; | |
| 1523 p->fts_errno = 0; | |
| 1524 p->fts_flags = 0; | |
| 1525 p->fts_instr = FTS_NOINSTR; | |
| 1526 p->fts_number = 0; | |
| 1527 p->fts_pointer = NULL; | |
| 1528 return (p); | |
| 1529 } | |
| 1530 | |
| 1531 static void | |
| 1532 internal_function | |
| 1533 fts_lfree (register FTSENT *head) | |
| 1534 { | |
| 1535 register FTSENT *p; | |
| 1536 | |
| 1537 /* Free a linked list of structures. */ | |
| 1538 while ((p = head)) { | |
| 1539 head = head->fts_link; | |
| 1540 free(p); | |
| 1541 } | |
| 1542 } | |
| 1543 | |
| 1544 /* | |
| 5907 | 1545 * Allow essentially unlimited file name lengths; find, rm, ls should |
| 1546 * all work on any tree. Most systems will allow creation of file | |
| 1547 * names much longer than MAXPATHLEN, even though the kernel won't | |
| 1548 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
| 1549 * so don't realloc the file name 2 bytes at a time. | |
| 5858 | 1550 */ |
| 1551 static bool | |
| 1552 internal_function | |
| 1553 fts_palloc (FTS *sp, size_t more) | |
| 1554 { | |
| 1555 char *p; | |
| 1556 size_t new_len = sp->fts_pathlen + more + 256; | |
| 1557 | |
| 1558 /* | |
| 1559 * See if fts_pathlen would overflow. | |
| 1560 */ | |
| 1561 if (new_len < sp->fts_pathlen) { | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
1562 free(sp->fts_path); |
| 5858 | 1563 sp->fts_path = NULL; |
| 1564 __set_errno (ENAMETOOLONG); | |
| 1565 return false; | |
| 1566 } | |
| 1567 sp->fts_pathlen = new_len; | |
| 1568 p = realloc(sp->fts_path, sp->fts_pathlen); | |
| 1569 if (p == NULL) { | |
| 1570 free(sp->fts_path); | |
| 1571 sp->fts_path = NULL; | |
| 1572 return false; | |
| 1573 } | |
| 1574 sp->fts_path = p; | |
| 1575 return true; | |
| 1576 } | |
| 1577 | |
| 1578 /* | |
| 5907 | 1579 * When the file name is realloc'd, have to fix all of the pointers in |
| 1580 * structures already returned. | |
| 5858 | 1581 */ |
| 1582 static void | |
| 1583 internal_function | |
| 1584 fts_padjust (FTS *sp, FTSENT *head) | |
| 1585 { | |
| 1586 FTSENT *p; | |
| 1587 char *addr = sp->fts_path; | |
| 1588 | |
| 1589 #define ADJUST(p) do { \ | |
| 1590 if ((p)->fts_accpath != (p)->fts_name) { \ | |
| 1591 (p)->fts_accpath = \ | |
| 1592 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
| 1593 } \ | |
| 1594 (p)->fts_path = addr; \ | |
| 1595 } while (0) | |
| 1596 /* Adjust the current set of children. */ | |
| 1597 for (p = sp->fts_child; p; p = p->fts_link) | |
| 1598 ADJUST(p); | |
| 1599 | |
| 1600 /* Adjust the rest of the tree, including the current level. */ | |
| 1601 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 1602 ADJUST(p); | |
| 1603 p = p->fts_link ? p->fts_link : p->fts_parent; | |
| 1604 } | |
| 1605 } | |
| 1606 | |
| 1607 static size_t | |
| 1608 internal_function | |
| 1609 fts_maxarglen (char * const *argv) | |
| 1610 { | |
| 1611 size_t len, max; | |
| 1612 | |
| 1613 for (max = 0; *argv; ++argv) | |
| 1614 if ((len = strlen(*argv)) > max) | |
| 1615 max = len; | |
| 1616 return (max + 1); | |
| 1617 } | |
| 1618 | |
| 1619 /* | |
| 5907 | 1620 * Change to dir specified by fd or file name without getting |
| 5858 | 1621 * tricked by someone changing the world out from underneath us. |
| 1622 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
| 7151 | 1623 * If FD is non-negative, expect it to be used after this function returns, |
| 1624 * and to be closed eventually. So don't pass e.g., `dirfd(dirp)' and then | |
| 1625 * do closedir(dirp), because that would invalidate the saved FD. | |
| 1626 * Upon failure, close FD immediately and return nonzero. | |
| 5858 | 1627 */ |
| 1628 static int | |
| 1629 internal_function | |
| 5907 | 1630 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
| 5858 | 1631 { |
| 7151 | 1632 int ret; |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1633 bool is_dotdot = dir && STREQ (dir, ".."); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1634 int newfd; |
|
7623
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1635 |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1636 /* This clause handles the unusual case in which FTS_NOCHDIR |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1637 is specified, along with FTS_CWDFD. In that case, there is |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1638 no need to change even the virtual cwd file descriptor. |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1639 However, if FD is non-negative, we do close it here. */ |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1640 if (ISSET (FTS_NOCHDIR)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1641 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1642 if (ISSET (FTS_CWDFD) && 0 <= fd) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1643 close (fd); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1644 return 0; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1645 } |
| 5858 | 1646 |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1647 if (fd < 0 && is_dotdot && ISSET (FTS_CWDFD)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1648 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1649 /* When possible, skip the diropen and subsequent fstat+dev/ino |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1650 comparison. I.e., when changing to parent directory |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1651 (chdir ("..")), use a file descriptor from the ring and |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1652 save the overhead of diropen+fstat, as well as avoiding |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1653 failure when we lack "x" access to the virtual cwd. */ |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1654 if ( ! i_ring_empty (&sp->fts_fd_ring)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1655 { |
|
7681
a6b7b31e9ddf
* lib/fts.c (fts_safe_changedir): Move a declaration "up",
Jim Meyering <jim@meyering.net>
parents:
7639
diff
changeset
|
1656 int parent_fd; |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1657 fd_ring_print (sp, stderr, "pre-pop"); |
|
7681
a6b7b31e9ddf
* lib/fts.c (fts_safe_changedir): Move a declaration "up",
Jim Meyering <jim@meyering.net>
parents:
7639
diff
changeset
|
1658 parent_fd = i_ring_pop (&sp->fts_fd_ring); |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1659 is_dotdot = true; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1660 if (0 <= parent_fd) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1661 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1662 fd = parent_fd; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1663 dir = NULL; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1664 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1665 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1666 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1667 |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1668 newfd = fd; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1669 if (fd < 0 && (newfd = diropen (sp, dir)) < 0) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1670 return -1; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1671 |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1672 /* The following dev/inode check is necessary if we're doing a |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1673 `logical' traversal (through symlinks, a la chown -L), if the |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1674 system lacks O_NOFOLLOW support, or if we're changing to ".." |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1675 (but not via a popped file descriptor). When changing to the |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1676 name "..", O_NOFOLLOW can't help. In general, when the target is |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1677 not "..", diropen's use of O_NOFOLLOW ensures we don't mistakenly |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1678 follow a symlink, so we can avoid the expense of this fstat. */ |
| 7408 | 1679 if (ISSET(FTS_LOGICAL) || ! HAVE_WORKING_O_NOFOLLOW |
| 7151 | 1680 || (dir && STREQ (dir, ".."))) |
| 1681 { | |
| 1682 struct stat sb; | |
| 1683 if (fstat(newfd, &sb)) | |
| 1684 { | |
| 5858 | 1685 ret = -1; |
| 1686 goto bail; | |
| 7151 | 1687 } |
| 1688 if (p->fts_statp->st_dev != sb.st_dev | |
| 1689 || p->fts_statp->st_ino != sb.st_ino) | |
| 1690 { | |
| 5858 | 1691 __set_errno (ENOENT); /* disinformation */ |
| 1692 ret = -1; | |
| 1693 goto bail; | |
| 7151 | 1694 } |
| 1695 } | |
| 1696 | |
| 1697 if (ISSET(FTS_CWDFD)) | |
| 1698 { | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1699 cwd_advance_fd (sp, newfd, ! is_dotdot); |
| 7151 | 1700 return 0; |
| 1701 } | |
| 1702 | |
| 5858 | 1703 ret = fchdir(newfd); |
| 1704 bail: | |
| 1705 if (fd < 0) | |
| 7151 | 1706 { |
| 1707 int oerrno = errno; | |
| 1708 (void)close(newfd); | |
| 1709 __set_errno (oerrno); | |
| 1710 } | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1711 return ret; |
| 5858 | 1712 } |