Mercurial > gnulib
annotate lib/progreloc.c @ 7863:cb2590895141
New module 'fchdir'.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 14 Jan 2007 11:32:10 +0000 |
| parents | 1c4ed7637c24 |
| children | fd48e35f4e5e |
| rev | line source |
|---|---|
| 4603 | 1 /* Provide relocatable programs. |
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2 Copyright (C) 2003-2006 Free Software Foundation, Inc. |
| 4603 | 3 Written by Bruno Haible <bruno@clisp.org>, 2003. |
| 4 | |
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5 This program is free software; you can redistribute it and/or modify |
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6 it under the terms of the GNU General Public License as published by |
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7 the Free Software Foundation; either version 2, or (at your option) |
| 4603 | 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 | |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 GNU General Public License for more details. |
| 4603 | 14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with this program; if not, write to the Free Software Foundation, |
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 4603 | 18 |
| 19 | |
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20 #include <config.h> |
| 4603 | 21 |
| 22 /* Specification. */ | |
| 23 #include "progname.h" | |
| 24 | |
| 25 #include <stdbool.h> | |
| 26 #include <stdio.h> | |
| 27 #include <stdlib.h> | |
| 28 #include <string.h> | |
| 29 #include <fcntl.h> | |
| 30 #if HAVE_UNISTD_H | |
| 31 # include <unistd.h> | |
| 32 #endif | |
| 33 #include <sys/stat.h> | |
| 34 | |
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35 /* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer. */ |
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36 #if HAVE_MACH_O_DYLD_H |
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37 # include <mach-o/dyld.h> |
| 4603 | 38 #endif |
| 39 | |
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40 #if defined _WIN32 || defined __WIN32__ |
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41 # define WIN32_NATIVE |
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42 #endif |
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43 |
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44 #if defined WIN32_NATIVE || defined __CYGWIN__ |
| 4603 | 45 # define WIN32_LEAN_AND_MEAN |
| 46 # include <windows.h> | |
| 47 #endif | |
| 48 | |
| 49 #include "xreadlink.h" | |
| 50 #include "canonicalize.h" | |
| 51 #include "relocatable.h" | |
| 52 | |
| 53 #ifdef NO_XMALLOC | |
| 54 # define xmalloc malloc | |
| 5583 | 55 # define xstrdup strdup |
| 4603 | 56 #else |
| 5583 | 57 # include "xalloc.h" |
| 4603 | 58 #endif |
| 59 | |
| 60 /* Pathname support. | |
| 61 ISSLASH(C) tests whether C is a directory separator character. | |
| 62 IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. | |
| 63 */ | |
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64 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
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65 /* Win32, Cygwin, OS/2, DOS */ |
| 4603 | 66 # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| 67 # define HAS_DEVICE(P) \ | |
| 68 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ | |
| 69 && (P)[1] == ':') | |
| 70 # define IS_PATH_WITH_DIR(P) \ | |
| 71 (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P)) | |
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72 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) |
| 4603 | 73 #else |
| 74 /* Unix */ | |
| 75 # define ISSLASH(C) ((C) == '/') | |
| 76 # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL) | |
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77 # define FILE_SYSTEM_PREFIX_LEN(P) 0 |
| 4603 | 78 #endif |
| 79 | |
| 7863 | 80 /* The results of open() in this file are not used with fchdir, |
| 81 therefore save some unnecessary work in fchdir.c. */ | |
| 82 #undef open | |
| 83 #undef close | |
| 84 | |
| 4603 | 85 #undef set_program_name |
| 86 | |
| 87 | |
| 88 #if ENABLE_RELOCATABLE | |
| 89 | |
| 90 #ifdef __linux__ | |
| 91 /* File descriptor of the executable. | |
| 92 (Only used to verify that we find the correct executable.) */ | |
| 93 static int executable_fd = -1; | |
| 94 #endif | |
| 95 | |
| 96 /* Tests whether a given pathname may belong to the executable. */ | |
| 97 static bool | |
| 98 maybe_executable (const char *filename) | |
| 99 { | |
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100 /* Woe32 lacks the access() function, but Cygwin doesn't. */ |
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101 #if !(defined WIN32_NATIVE && !defined __CYGWIN__) |
| 4603 | 102 if (access (filename, X_OK) < 0) |
| 103 return false; | |
| 104 | |
| 105 #ifdef __linux__ | |
| 106 if (executable_fd >= 0) | |
| 107 { | |
| 108 /* If we already have an executable_fd, check that filename points to | |
| 109 the same inode. */ | |
| 110 struct stat statexe; | |
| 111 struct stat statfile; | |
| 112 | |
| 113 if (fstat (executable_fd, &statexe) >= 0) | |
| 114 { | |
| 115 if (stat (filename, &statfile) < 0) | |
| 116 return false; | |
| 117 if (!(statfile.st_dev | |
| 118 && statfile.st_dev == statexe.st_dev | |
| 119 && statfile.st_ino == statexe.st_ino)) | |
| 120 return false; | |
| 121 } | |
| 122 } | |
| 123 #endif | |
| 124 #endif | |
| 125 | |
| 126 return true; | |
| 127 } | |
| 128 | |
| 129 /* Determine the full pathname of the current executable, freshly allocated. | |
| 130 Return NULL if unknown. | |
| 131 Guaranteed to work on Linux and Woe32. Likely to work on the other | |
| 132 Unixes (maybe except BeOS), under most conditions. */ | |
| 133 static char * | |
| 134 find_executable (const char *argv0) | |
| 135 { | |
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136 #if defined WIN32_NATIVE || defined __CYGWIN__ |
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137 char location[MAX_PATH]; |
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138 int length = GetModuleFileName (NULL, location, sizeof (location)); |
| 4603 | 139 if (length < 0) |
| 140 return NULL; | |
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141 if (!IS_PATH_WITH_DIR (location)) |
| 4603 | 142 /* Shouldn't happen. */ |
| 143 return NULL; | |
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144 { |
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145 #if defined __CYGWIN__ |
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146 /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like |
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147 implementation: readlink of "/proc/self/exe". But using the |
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148 result of the Win32 system call is simpler and is consistent with the |
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149 code in relocatable.c. */ |
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150 /* On Cygwin, we need to convert paths coming from Win32 system calls |
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151 to the Unix-like slashified notation. */ |
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152 static char location_as_posix_path[2 * MAX_PATH]; |
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153 /* There's no error return defined for cygwin_conv_to_posix_path. |
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154 See cygwin-api/func-cygwin-conv-to-posix-path.html. |
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155 Does it overflow the buffer of expected size MAX_PATH or does it |
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156 truncate the path? I don't know. Let's catch both. */ |
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157 cygwin_conv_to_posix_path (location, location_as_posix_path); |
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158 location_as_posix_path[MAX_PATH - 1] = '\0'; |
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159 if (strlen (location_as_posix_path) >= MAX_PATH - 1) |
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160 /* A sign of buffer overflow or path truncation. */ |
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161 return NULL; |
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162 /* Call canonicalize_file_name, because Cygwin supports symbolic links. */ |
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163 return canonicalize_file_name (location_as_posix_path); |
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164 #else |
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165 return xstrdup (location); |
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166 #endif |
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167 } |
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168 #else /* Unix && !Cygwin */ |
| 4603 | 169 #ifdef __linux__ |
| 170 /* The executable is accessible as /proc/<pid>/exe. In newer Linux | |
| 171 versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink | |
| 172 to the true pathname; older Linux versions give only device and ino, | |
| 173 enclosed in brackets, which we cannot use here. */ | |
| 174 { | |
| 175 char *link; | |
| 176 | |
| 177 link = xreadlink ("/proc/self/exe"); | |
| 178 if (link != NULL && link[0] != '[') | |
| 179 return link; | |
| 180 if (executable_fd < 0) | |
| 181 executable_fd = open ("/proc/self/exe", O_RDONLY, 0); | |
| 182 | |
| 183 { | |
| 184 char buf[6+10+5]; | |
| 185 sprintf (buf, "/proc/%d/exe", getpid ()); | |
| 186 link = xreadlink (buf); | |
| 187 if (link != NULL && link[0] != '[') | |
| 188 return link; | |
| 189 if (executable_fd < 0) | |
| 190 executable_fd = open (buf, O_RDONLY, 0); | |
| 191 } | |
| 192 } | |
| 193 #endif | |
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194 #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH |
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195 /* On MacOS X 10.2 or newer, the function |
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196 int _NSGetExecutablePath (char *buf, unsigned long *bufsize); |
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197 can be used to retrieve the executable's full path. */ |
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198 char location[4096]; |
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199 unsigned long length = sizeof (location); |
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200 if (_NSGetExecutablePath (location, &length) == 0 |
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201 && location[0] == '/') |
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202 return canonicalize_file_name (location); |
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203 #endif |
| 4603 | 204 /* Guess the executable's full path. We assume the executable has been |
| 205 called via execlp() or execvp() with properly set up argv[0]. The | |
| 206 login(1) convention to add a '-' prefix to argv[0] is not supported. */ | |
| 207 { | |
| 208 bool has_slash = false; | |
| 209 { | |
| 210 const char *p; | |
| 211 for (p = argv0; *p; p++) | |
| 212 if (*p == '/') | |
| 213 { | |
| 214 has_slash = true; | |
| 215 break; | |
| 216 } | |
| 217 } | |
| 218 if (!has_slash) | |
| 219 { | |
| 220 /* exec searches paths without slashes in the directory list given | |
| 221 by $PATH. */ | |
| 222 const char *path = getenv ("PATH"); | |
| 223 | |
| 224 if (path != NULL) | |
| 225 { | |
| 226 const char *p; | |
| 227 const char *p_next; | |
| 228 | |
| 229 for (p = path; *p; p = p_next) | |
| 230 { | |
| 231 const char *q; | |
| 232 size_t p_len; | |
| 233 char *concat_name; | |
| 234 | |
| 235 for (q = p; *q; q++) | |
| 236 if (*q == ':') | |
| 237 break; | |
| 238 p_len = q - p; | |
| 239 p_next = (*q == '\0' ? q : q + 1); | |
| 240 | |
| 241 /* We have a path item at p, of length p_len. | |
| 242 Now concatenate the path item and argv0. */ | |
| 243 concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2); | |
| 244 #ifdef NO_XMALLOC | |
| 245 if (concat_name == NULL) | |
| 246 return NULL; | |
| 247 #endif | |
| 248 if (p_len == 0) | |
| 249 /* An empty PATH element designates the current directory. */ | |
| 250 strcpy (concat_name, argv0); | |
| 251 else | |
| 252 { | |
| 253 memcpy (concat_name, p, p_len); | |
| 254 concat_name[p_len] = '/'; | |
| 255 strcpy (concat_name + p_len + 1, argv0); | |
| 256 } | |
| 257 if (maybe_executable (concat_name)) | |
| 258 return canonicalize_file_name (concat_name); | |
| 259 free (concat_name); | |
| 260 } | |
| 261 } | |
| 262 /* Not found in the PATH, assume the current directory. */ | |
| 263 } | |
| 264 /* exec treats paths containing slashes as relative to the current | |
| 265 directory. */ | |
| 266 if (maybe_executable (argv0)) | |
| 267 return canonicalize_file_name (argv0); | |
| 268 } | |
| 269 /* No way to find the executable. */ | |
| 270 return NULL; | |
| 271 #endif | |
| 272 } | |
| 273 | |
| 274 /* Full pathname of executable, or NULL. */ | |
| 275 static char *executable_fullname; | |
| 276 | |
| 277 static void | |
| 278 prepare_relocate (const char *orig_installprefix, const char *orig_installdir, | |
| 279 const char *argv0) | |
| 280 { | |
| 281 const char *curr_prefix; | |
| 282 | |
| 283 /* Determine the full pathname of the current executable. */ | |
| 284 executable_fullname = find_executable (argv0); | |
| 285 | |
| 286 /* Determine the current installation prefix from it. */ | |
| 287 curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir, | |
| 288 executable_fullname); | |
| 289 if (curr_prefix != NULL) | |
| 290 /* Now pass this prefix to all copies of the relocate.c source file. */ | |
| 291 set_relocation_prefix (orig_installprefix, curr_prefix); | |
| 292 } | |
| 293 | |
| 294 /* Set program_name, based on argv[0], and original installation prefix and | |
| 295 directory, for relocatability. */ | |
| 296 void | |
| 297 set_program_name_and_installdir (const char *argv0, | |
| 298 const char *orig_installprefix, | |
| 299 const char *orig_installdir) | |
| 300 { | |
| 301 const char *argv0_stripped = argv0; | |
| 302 | |
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303 /* Relocatable programs are renamed to .bin by install-reloc. Or, more |
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304 generally, their suffix is changed from $exeext to .bin$exeext. |
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305 Remove the ".bin" here. */ |
| 4603 | 306 { |
| 307 size_t argv0_len = strlen (argv0); | |
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308 const size_t exeext_len = sizeof (EXEEXT) - sizeof (""); |
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309 if (argv0_len > 4 + exeext_len) |
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310 if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0) |
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311 { |
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312 if (sizeof (EXEEXT) > sizeof ("")) |
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313 { |
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314 /* Compare using an inlined copy of c_strncasecmp(), because |
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315 the filenames may have undergone a case conversion since |
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316 they were packaged. In other words, EXEEXT may be ".exe" |
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317 on one system and ".EXE" on another. */ |
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318 static const char exeext[] = EXEEXT; |
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319 const char *s1 = argv0 + argv0_len - exeext_len; |
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320 const char *s2 = exeext; |
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321 for (; *s1 != '\0'; s1++, s2++) |
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322 { |
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323 unsigned char c1 = *s1; |
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324 unsigned char c2 = *s2; |
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325 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1) |
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326 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2)) |
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327 goto done_stripping; |
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328 } |
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329 } |
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330 /* Remove ".bin" before EXEEXT or its equivalent. */ |
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331 { |
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332 char *shorter = (char *) xmalloc (argv0_len - 4 + 1); |
| 4603 | 333 #ifdef NO_XMALLOC |
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334 if (shorter != NULL) |
| 4603 | 335 #endif |
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336 { |
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337 memcpy (shorter, argv0, argv0_len - exeext_len - 4); |
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338 if (sizeof (EXEEXT) > sizeof ("")) |
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339 memcpy (shorter + argv0_len - exeext_len - 4, |
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340 argv0 + argv0_len - exeext_len - 4, |
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341 exeext_len); |
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342 shorter[argv0_len - 4] = '\0'; |
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343 argv0_stripped = shorter; |
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344 } |
| 4603 | 345 } |
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346 done_stripping: ; |
| 4603 | 347 } |
| 348 } | |
| 349 | |
| 350 set_program_name (argv0_stripped); | |
| 351 | |
| 352 prepare_relocate (orig_installprefix, orig_installdir, argv0); | |
| 353 } | |
| 354 | |
| 355 /* Return the full pathname of the current executable, based on the earlier | |
| 356 call to set_program_name_and_installdir. Return NULL if unknown. */ | |
| 357 char * | |
| 4691 | 358 get_full_program_name (void) |
| 4603 | 359 { |
| 360 return executable_fullname; | |
| 361 } | |
| 362 | |
| 363 #endif |