Mercurial > gnulib
annotate lib/progreloc.c @ 9309:bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 07 Oct 2007 19:14:58 +0200 |
| parents | fd48e35f4e5e |
| children | c3d038b0b4d3 |
| 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 3 of the License, or |
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8 (at your option) any later version. |
| 4603 | 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, see <http://www.gnu.org/licenses/>. */ |
| 4603 | 17 |
| 18 | |
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19 #include <config.h> |
| 4603 | 20 |
| 21 /* Specification. */ | |
| 22 #include "progname.h" | |
| 23 | |
| 24 #include <stdbool.h> | |
| 25 #include <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <string.h> | |
| 28 #include <fcntl.h> | |
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29 #include <unistd.h> |
| 4603 | 30 #include <sys/stat.h> |
| 31 | |
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32 /* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer. */ |
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33 #if HAVE_MACH_O_DYLD_H |
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34 # include <mach-o/dyld.h> |
| 4603 | 35 #endif |
| 36 | |
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37 #if defined _WIN32 || defined __WIN32__ |
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38 # define WIN32_NATIVE |
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39 #endif |
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40 |
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41 #if defined WIN32_NATIVE || defined __CYGWIN__ |
| 4603 | 42 # define WIN32_LEAN_AND_MEAN |
| 43 # include <windows.h> | |
| 44 #endif | |
| 45 | |
| 46 #include "xreadlink.h" | |
| 47 #include "canonicalize.h" | |
| 48 #include "relocatable.h" | |
| 49 | |
| 50 #ifdef NO_XMALLOC | |
| 51 # define xmalloc malloc | |
| 5583 | 52 # define xstrdup strdup |
| 4603 | 53 #else |
| 5583 | 54 # include "xalloc.h" |
| 4603 | 55 #endif |
| 56 | |
| 57 /* Pathname support. | |
| 58 ISSLASH(C) tests whether C is a directory separator character. | |
| 59 IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. | |
| 60 */ | |
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61 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
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62 /* Win32, Cygwin, OS/2, DOS */ |
| 4603 | 63 # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| 64 # define HAS_DEVICE(P) \ | |
| 65 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ | |
| 66 && (P)[1] == ':') | |
| 67 # define IS_PATH_WITH_DIR(P) \ | |
| 68 (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P)) | |
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69 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) |
| 4603 | 70 #else |
| 71 /* Unix */ | |
| 72 # define ISSLASH(C) ((C) == '/') | |
| 73 # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL) | |
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74 # define FILE_SYSTEM_PREFIX_LEN(P) 0 |
| 4603 | 75 #endif |
| 76 | |
| 7863 | 77 /* The results of open() in this file are not used with fchdir, |
| 78 therefore save some unnecessary work in fchdir.c. */ | |
| 79 #undef open | |
| 80 #undef close | |
| 81 | |
| 4603 | 82 #undef set_program_name |
| 83 | |
| 84 | |
| 85 #if ENABLE_RELOCATABLE | |
| 86 | |
| 87 #ifdef __linux__ | |
| 88 /* File descriptor of the executable. | |
| 89 (Only used to verify that we find the correct executable.) */ | |
| 90 static int executable_fd = -1; | |
| 91 #endif | |
| 92 | |
| 93 /* Tests whether a given pathname may belong to the executable. */ | |
| 94 static bool | |
| 95 maybe_executable (const char *filename) | |
| 96 { | |
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97 /* Woe32 lacks the access() function, but Cygwin doesn't. */ |
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98 #if !(defined WIN32_NATIVE && !defined __CYGWIN__) |
| 4603 | 99 if (access (filename, X_OK) < 0) |
| 100 return false; | |
| 101 | |
| 102 #ifdef __linux__ | |
| 103 if (executable_fd >= 0) | |
| 104 { | |
| 105 /* If we already have an executable_fd, check that filename points to | |
| 106 the same inode. */ | |
| 107 struct stat statexe; | |
| 108 struct stat statfile; | |
| 109 | |
| 110 if (fstat (executable_fd, &statexe) >= 0) | |
| 111 { | |
| 112 if (stat (filename, &statfile) < 0) | |
| 113 return false; | |
| 114 if (!(statfile.st_dev | |
| 115 && statfile.st_dev == statexe.st_dev | |
| 116 && statfile.st_ino == statexe.st_ino)) | |
| 117 return false; | |
| 118 } | |
| 119 } | |
| 120 #endif | |
| 121 #endif | |
| 122 | |
| 123 return true; | |
| 124 } | |
| 125 | |
| 126 /* Determine the full pathname of the current executable, freshly allocated. | |
| 127 Return NULL if unknown. | |
| 128 Guaranteed to work on Linux and Woe32. Likely to work on the other | |
| 129 Unixes (maybe except BeOS), under most conditions. */ | |
| 130 static char * | |
| 131 find_executable (const char *argv0) | |
| 132 { | |
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133 #if defined WIN32_NATIVE || defined __CYGWIN__ |
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134 char location[MAX_PATH]; |
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135 int length = GetModuleFileName (NULL, location, sizeof (location)); |
| 4603 | 136 if (length < 0) |
| 137 return NULL; | |
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138 if (!IS_PATH_WITH_DIR (location)) |
| 4603 | 139 /* Shouldn't happen. */ |
| 140 return NULL; | |
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141 { |
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142 #if defined __CYGWIN__ |
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143 /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like |
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144 implementation: readlink of "/proc/self/exe". But using the |
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145 result of the Win32 system call is simpler and is consistent with the |
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146 code in relocatable.c. */ |
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147 /* On Cygwin, we need to convert paths coming from Win32 system calls |
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148 to the Unix-like slashified notation. */ |
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149 static char location_as_posix_path[2 * MAX_PATH]; |
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150 /* There's no error return defined for cygwin_conv_to_posix_path. |
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151 See cygwin-api/func-cygwin-conv-to-posix-path.html. |
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152 Does it overflow the buffer of expected size MAX_PATH or does it |
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153 truncate the path? I don't know. Let's catch both. */ |
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154 cygwin_conv_to_posix_path (location, location_as_posix_path); |
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155 location_as_posix_path[MAX_PATH - 1] = '\0'; |
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156 if (strlen (location_as_posix_path) >= MAX_PATH - 1) |
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157 /* A sign of buffer overflow or path truncation. */ |
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158 return NULL; |
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159 /* Call canonicalize_file_name, because Cygwin supports symbolic links. */ |
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160 return canonicalize_file_name (location_as_posix_path); |
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161 #else |
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162 return xstrdup (location); |
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163 #endif |
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164 } |
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165 #else /* Unix && !Cygwin */ |
| 4603 | 166 #ifdef __linux__ |
| 167 /* The executable is accessible as /proc/<pid>/exe. In newer Linux | |
| 168 versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink | |
| 169 to the true pathname; older Linux versions give only device and ino, | |
| 170 enclosed in brackets, which we cannot use here. */ | |
| 171 { | |
| 172 char *link; | |
| 173 | |
| 174 link = xreadlink ("/proc/self/exe"); | |
| 175 if (link != NULL && link[0] != '[') | |
| 176 return link; | |
| 177 if (executable_fd < 0) | |
| 178 executable_fd = open ("/proc/self/exe", O_RDONLY, 0); | |
| 179 | |
| 180 { | |
| 181 char buf[6+10+5]; | |
| 182 sprintf (buf, "/proc/%d/exe", getpid ()); | |
| 183 link = xreadlink (buf); | |
| 184 if (link != NULL && link[0] != '[') | |
| 185 return link; | |
| 186 if (executable_fd < 0) | |
| 187 executable_fd = open (buf, O_RDONLY, 0); | |
| 188 } | |
| 189 } | |
| 190 #endif | |
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191 #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH |
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192 /* On MacOS X 10.2 or newer, the function |
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193 int _NSGetExecutablePath (char *buf, unsigned long *bufsize); |
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194 can be used to retrieve the executable's full path. */ |
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195 char location[4096]; |
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196 unsigned long length = sizeof (location); |
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197 if (_NSGetExecutablePath (location, &length) == 0 |
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198 && location[0] == '/') |
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199 return canonicalize_file_name (location); |
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200 #endif |
| 4603 | 201 /* Guess the executable's full path. We assume the executable has been |
| 202 called via execlp() or execvp() with properly set up argv[0]. The | |
| 203 login(1) convention to add a '-' prefix to argv[0] is not supported. */ | |
| 204 { | |
| 205 bool has_slash = false; | |
| 206 { | |
| 207 const char *p; | |
| 208 for (p = argv0; *p; p++) | |
| 209 if (*p == '/') | |
| 210 { | |
| 211 has_slash = true; | |
| 212 break; | |
| 213 } | |
| 214 } | |
| 215 if (!has_slash) | |
| 216 { | |
| 217 /* exec searches paths without slashes in the directory list given | |
| 218 by $PATH. */ | |
| 219 const char *path = getenv ("PATH"); | |
| 220 | |
| 221 if (path != NULL) | |
| 222 { | |
| 223 const char *p; | |
| 224 const char *p_next; | |
| 225 | |
| 226 for (p = path; *p; p = p_next) | |
| 227 { | |
| 228 const char *q; | |
| 229 size_t p_len; | |
| 230 char *concat_name; | |
| 231 | |
| 232 for (q = p; *q; q++) | |
| 233 if (*q == ':') | |
| 234 break; | |
| 235 p_len = q - p; | |
| 236 p_next = (*q == '\0' ? q : q + 1); | |
| 237 | |
| 238 /* We have a path item at p, of length p_len. | |
| 239 Now concatenate the path item and argv0. */ | |
| 240 concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2); | |
| 241 #ifdef NO_XMALLOC | |
| 242 if (concat_name == NULL) | |
| 243 return NULL; | |
| 244 #endif | |
| 245 if (p_len == 0) | |
| 246 /* An empty PATH element designates the current directory. */ | |
| 247 strcpy (concat_name, argv0); | |
| 248 else | |
| 249 { | |
| 250 memcpy (concat_name, p, p_len); | |
| 251 concat_name[p_len] = '/'; | |
| 252 strcpy (concat_name + p_len + 1, argv0); | |
| 253 } | |
| 254 if (maybe_executable (concat_name)) | |
| 255 return canonicalize_file_name (concat_name); | |
| 256 free (concat_name); | |
| 257 } | |
| 258 } | |
| 259 /* Not found in the PATH, assume the current directory. */ | |
| 260 } | |
| 261 /* exec treats paths containing slashes as relative to the current | |
| 262 directory. */ | |
| 263 if (maybe_executable (argv0)) | |
| 264 return canonicalize_file_name (argv0); | |
| 265 } | |
| 266 /* No way to find the executable. */ | |
| 267 return NULL; | |
| 268 #endif | |
| 269 } | |
| 270 | |
| 271 /* Full pathname of executable, or NULL. */ | |
| 272 static char *executable_fullname; | |
| 273 | |
| 274 static void | |
| 275 prepare_relocate (const char *orig_installprefix, const char *orig_installdir, | |
| 276 const char *argv0) | |
| 277 { | |
| 278 const char *curr_prefix; | |
| 279 | |
| 280 /* Determine the full pathname of the current executable. */ | |
| 281 executable_fullname = find_executable (argv0); | |
| 282 | |
| 283 /* Determine the current installation prefix from it. */ | |
| 284 curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir, | |
| 285 executable_fullname); | |
| 286 if (curr_prefix != NULL) | |
| 287 /* Now pass this prefix to all copies of the relocate.c source file. */ | |
| 288 set_relocation_prefix (orig_installprefix, curr_prefix); | |
| 289 } | |
| 290 | |
| 291 /* Set program_name, based on argv[0], and original installation prefix and | |
| 292 directory, for relocatability. */ | |
| 293 void | |
| 294 set_program_name_and_installdir (const char *argv0, | |
| 295 const char *orig_installprefix, | |
| 296 const char *orig_installdir) | |
| 297 { | |
| 298 const char *argv0_stripped = argv0; | |
| 299 | |
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300 /* Relocatable programs are renamed to .bin by install-reloc. Or, more |
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301 generally, their suffix is changed from $exeext to .bin$exeext. |
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302 Remove the ".bin" here. */ |
| 4603 | 303 { |
| 304 size_t argv0_len = strlen (argv0); | |
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305 const size_t exeext_len = sizeof (EXEEXT) - sizeof (""); |
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306 if (argv0_len > 4 + exeext_len) |
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307 if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0) |
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308 { |
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309 if (sizeof (EXEEXT) > sizeof ("")) |
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310 { |
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311 /* Compare using an inlined copy of c_strncasecmp(), because |
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312 the filenames may have undergone a case conversion since |
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313 they were packaged. In other words, EXEEXT may be ".exe" |
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314 on one system and ".EXE" on another. */ |
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315 static const char exeext[] = EXEEXT; |
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316 const char *s1 = argv0 + argv0_len - exeext_len; |
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317 const char *s2 = exeext; |
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318 for (; *s1 != '\0'; s1++, s2++) |
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319 { |
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320 unsigned char c1 = *s1; |
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321 unsigned char c2 = *s2; |
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322 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1) |
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323 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2)) |
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324 goto done_stripping; |
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325 } |
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326 } |
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327 /* Remove ".bin" before EXEEXT or its equivalent. */ |
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328 { |
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329 char *shorter = (char *) xmalloc (argv0_len - 4 + 1); |
| 4603 | 330 #ifdef NO_XMALLOC |
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331 if (shorter != NULL) |
| 4603 | 332 #endif |
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333 { |
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334 memcpy (shorter, argv0, argv0_len - exeext_len - 4); |
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335 if (sizeof (EXEEXT) > sizeof ("")) |
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336 memcpy (shorter + argv0_len - exeext_len - 4, |
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337 argv0 + argv0_len - exeext_len - 4, |
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338 exeext_len); |
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339 shorter[argv0_len - 4] = '\0'; |
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340 argv0_stripped = shorter; |
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341 } |
| 4603 | 342 } |
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343 done_stripping: ; |
| 4603 | 344 } |
| 345 } | |
| 346 | |
| 347 set_program_name (argv0_stripped); | |
| 348 | |
| 349 prepare_relocate (orig_installprefix, orig_installdir, argv0); | |
| 350 } | |
| 351 | |
| 352 /* Return the full pathname of the current executable, based on the earlier | |
| 353 call to set_program_name_and_installdir. Return NULL if unknown. */ | |
| 354 char * | |
| 4691 | 355 get_full_program_name (void) |
| 4603 | 356 { |
| 357 return executable_fullname; | |
| 358 } | |
| 359 | |
| 360 #endif |