Mercurial > gnulib
annotate lib/progreloc.c @ 14384:588ed4cdea87
Fix misindentation of preprocessor directives.
* lib/argp-namefrob.h: Reindent preprocessor directives.
* lib/getopt_int.h (struct _getopt_data): Likewise.
* lib/progreloc.c (maybe_executable, find_executable): Likewise.
* lib/vasnprintf.c (decode_long_double): Likewise.
* tests/test-argmatch.c: Insert blank lines, for clarity.
* tests/test-exclude.c: Likewise.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Wed, 23 Feb 2011 10:58:06 +0100 |
| parents | 97fc9a21a8fb |
| children | 5e10178f1466 |
| rev | line source |
|---|---|
| 4603 | 1 /* Provide relocatable programs. |
|
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2 Copyright (C) 2003-2011 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 "relocatable.h" | |
| 47 | |
| 48 #ifdef NO_XMALLOC | |
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49 # include "areadlink.h" |
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50 # define xreadlink areadlink |
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51 #else |
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52 # include "xreadlink.h" |
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53 #endif |
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54 |
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55 #ifdef NO_XMALLOC |
| 4603 | 56 # define xmalloc malloc |
| 5583 | 57 # define xstrdup strdup |
| 4603 | 58 #else |
| 5583 | 59 # include "xalloc.h" |
| 4603 | 60 #endif |
| 61 | |
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62 #ifndef O_EXEC |
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63 # define O_EXEC O_RDONLY /* This is often close enough in older systems. */ |
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64 #endif |
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65 |
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66 /* Declare canonicalize_file_name. |
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67 The <stdlib.h> included above may be the system's one, not the gnulib |
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68 one. */ |
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69 extern char * canonicalize_file_name (const char *name); |
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70 |
| 4603 | 71 /* Pathname support. |
| 72 ISSLASH(C) tests whether C is a directory separator character. | |
| 73 IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. | |
| 74 */ | |
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75 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
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76 /* Win32, Cygwin, OS/2, DOS */ |
| 4603 | 77 # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| 78 # define HAS_DEVICE(P) \ | |
| 79 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ | |
| 80 && (P)[1] == ':') | |
| 81 # define IS_PATH_WITH_DIR(P) \ | |
| 82 (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P)) | |
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83 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) |
| 4603 | 84 #else |
| 85 /* Unix */ | |
| 86 # define ISSLASH(C) ((C) == '/') | |
| 87 # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL) | |
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88 # define FILE_SYSTEM_PREFIX_LEN(P) 0 |
| 4603 | 89 #endif |
| 90 | |
| 7863 | 91 /* The results of open() in this file are not used with fchdir, |
| 92 therefore save some unnecessary work in fchdir.c. */ | |
| 93 #undef open | |
| 94 #undef close | |
| 95 | |
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96 /* Use the system functions, not the gnulib overrides in this file. */ |
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97 #undef malloc |
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98 #undef sprintf |
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99 |
| 4603 | 100 #undef set_program_name |
| 101 | |
| 102 | |
| 103 #if ENABLE_RELOCATABLE | |
| 104 | |
| 105 #ifdef __linux__ | |
| 106 /* File descriptor of the executable. | |
| 107 (Only used to verify that we find the correct executable.) */ | |
| 108 static int executable_fd = -1; | |
| 109 #endif | |
| 110 | |
| 111 /* Tests whether a given pathname may belong to the executable. */ | |
| 112 static bool | |
| 113 maybe_executable (const char *filename) | |
| 114 { | |
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115 /* Woe32 lacks the access() function, but Cygwin doesn't. */ |
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116 #if !(defined WIN32_NATIVE && !defined __CYGWIN__) |
| 4603 | 117 if (access (filename, X_OK) < 0) |
| 118 return false; | |
| 119 | |
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120 # ifdef __linux__ |
| 4603 | 121 if (executable_fd >= 0) |
| 122 { | |
| 123 /* If we already have an executable_fd, check that filename points to | |
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124 the same inode. */ |
| 4603 | 125 struct stat statexe; |
| 126 struct stat statfile; | |
| 127 | |
| 128 if (fstat (executable_fd, &statexe) >= 0) | |
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129 { |
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130 if (stat (filename, &statfile) < 0) |
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131 return false; |
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132 if (!(statfile.st_dev |
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133 && statfile.st_dev == statexe.st_dev |
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134 && statfile.st_ino == statexe.st_ino)) |
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135 return false; |
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136 } |
| 4603 | 137 } |
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138 # endif |
| 4603 | 139 #endif |
| 140 | |
| 141 return true; | |
| 142 } | |
| 143 | |
| 144 /* Determine the full pathname of the current executable, freshly allocated. | |
| 145 Return NULL if unknown. | |
| 146 Guaranteed to work on Linux and Woe32. Likely to work on the other | |
| 147 Unixes (maybe except BeOS), under most conditions. */ | |
| 148 static char * | |
| 149 find_executable (const char *argv0) | |
| 150 { | |
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151 #if defined WIN32_NATIVE || defined __CYGWIN__ |
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152 char location[MAX_PATH]; |
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153 int length = GetModuleFileName (NULL, location, sizeof (location)); |
| 4603 | 154 if (length < 0) |
| 155 return NULL; | |
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156 if (!IS_PATH_WITH_DIR (location)) |
| 4603 | 157 /* Shouldn't happen. */ |
| 158 return NULL; | |
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159 { |
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160 # if defined __CYGWIN__ |
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161 /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like |
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162 implementation: readlink of "/proc/self/exe". But using the |
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163 result of the Win32 system call is simpler and is consistent with the |
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164 code in relocatable.c. */ |
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165 /* On Cygwin, we need to convert paths coming from Win32 system calls |
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166 to the Unix-like slashified notation. */ |
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167 static char location_as_posix_path[2 * MAX_PATH]; |
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168 /* There's no error return defined for cygwin_conv_to_posix_path. |
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169 See cygwin-api/func-cygwin-conv-to-posix-path.html. |
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170 Does it overflow the buffer of expected size MAX_PATH or does it |
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171 truncate the path? I don't know. Let's catch both. */ |
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172 cygwin_conv_to_posix_path (location, location_as_posix_path); |
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173 location_as_posix_path[MAX_PATH - 1] = '\0'; |
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174 if (strlen (location_as_posix_path) >= MAX_PATH - 1) |
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175 /* A sign of buffer overflow or path truncation. */ |
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176 return NULL; |
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177 /* Call canonicalize_file_name, because Cygwin supports symbolic links. */ |
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178 return canonicalize_file_name (location_as_posix_path); |
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179 # else |
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180 return xstrdup (location); |
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181 # endif |
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182 } |
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183 #else /* Unix && !Cygwin */ |
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184 # ifdef __linux__ |
| 4603 | 185 /* The executable is accessible as /proc/<pid>/exe. In newer Linux |
| 186 versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink | |
| 187 to the true pathname; older Linux versions give only device and ino, | |
| 188 enclosed in brackets, which we cannot use here. */ | |
| 189 { | |
| 190 char *link; | |
| 191 | |
| 192 link = xreadlink ("/proc/self/exe"); | |
| 193 if (link != NULL && link[0] != '[') | |
| 194 return link; | |
| 195 if (executable_fd < 0) | |
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196 executable_fd = open ("/proc/self/exe", O_EXEC, 0); |
| 4603 | 197 |
| 198 { | |
| 199 char buf[6+10+5]; | |
| 200 sprintf (buf, "/proc/%d/exe", getpid ()); | |
| 201 link = xreadlink (buf); | |
| 202 if (link != NULL && link[0] != '[') | |
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203 return link; |
| 4603 | 204 if (executable_fd < 0) |
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205 executable_fd = open (buf, O_EXEC, 0); |
| 4603 | 206 } |
| 207 } | |
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208 # endif |
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209 # if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH |
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210 /* On MacOS X 10.2 or newer, the function |
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211 int _NSGetExecutablePath (char *buf, uint32_t *bufsize); |
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212 can be used to retrieve the executable's full path. */ |
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213 char location[4096]; |
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214 unsigned int length = sizeof (location); |
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215 if (_NSGetExecutablePath (location, &length) == 0 |
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216 && location[0] == '/') |
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217 return canonicalize_file_name (location); |
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218 # endif |
| 4603 | 219 /* Guess the executable's full path. We assume the executable has been |
| 220 called via execlp() or execvp() with properly set up argv[0]. The | |
| 221 login(1) convention to add a '-' prefix to argv[0] is not supported. */ | |
| 222 { | |
| 223 bool has_slash = false; | |
| 224 { | |
| 225 const char *p; | |
| 226 for (p = argv0; *p; p++) | |
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227 if (*p == '/') |
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228 { |
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229 has_slash = true; |
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230 break; |
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231 } |
| 4603 | 232 } |
| 233 if (!has_slash) | |
| 234 { | |
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235 /* exec searches paths without slashes in the directory list given |
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236 by $PATH. */ |
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237 const char *path = getenv ("PATH"); |
| 4603 | 238 |
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239 if (path != NULL) |
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240 { |
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241 const char *p; |
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242 const char *p_next; |
| 4603 | 243 |
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244 for (p = path; *p; p = p_next) |
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245 { |
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246 const char *q; |
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247 size_t p_len; |
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248 char *concat_name; |
| 4603 | 249 |
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250 for (q = p; *q; q++) |
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251 if (*q == ':') |
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252 break; |
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253 p_len = q - p; |
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254 p_next = (*q == '\0' ? q : q + 1); |
| 4603 | 255 |
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256 /* We have a path item at p, of length p_len. |
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257 Now concatenate the path item and argv0. */ |
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258 concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2); |
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259 # ifdef NO_XMALLOC |
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260 if (concat_name == NULL) |
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261 return NULL; |
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262 # endif |
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263 if (p_len == 0) |
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264 /* An empty PATH element designates the current directory. */ |
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265 strcpy (concat_name, argv0); |
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266 else |
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267 { |
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268 memcpy (concat_name, p, p_len); |
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269 concat_name[p_len] = '/'; |
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270 strcpy (concat_name + p_len + 1, argv0); |
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271 } |
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272 if (maybe_executable (concat_name)) |
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273 return canonicalize_file_name (concat_name); |
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274 free (concat_name); |
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275 } |
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276 } |
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277 /* Not found in the PATH, assume the current directory. */ |
| 4603 | 278 } |
| 279 /* exec treats paths containing slashes as relative to the current | |
| 280 directory. */ | |
| 281 if (maybe_executable (argv0)) | |
| 282 return canonicalize_file_name (argv0); | |
| 283 } | |
| 284 /* No way to find the executable. */ | |
| 285 return NULL; | |
| 286 #endif | |
| 287 } | |
| 288 | |
| 289 /* Full pathname of executable, or NULL. */ | |
| 290 static char *executable_fullname; | |
| 291 | |
| 292 static void | |
| 293 prepare_relocate (const char *orig_installprefix, const char *orig_installdir, | |
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294 const char *argv0) |
| 4603 | 295 { |
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296 char *curr_prefix; |
| 4603 | 297 |
| 298 /* Determine the full pathname of the current executable. */ | |
| 299 executable_fullname = find_executable (argv0); | |
| 300 | |
| 301 /* Determine the current installation prefix from it. */ | |
| 302 curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir, | |
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303 executable_fullname); |
| 4603 | 304 if (curr_prefix != NULL) |
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305 { |
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306 /* Now pass this prefix to all copies of the relocate.c source file. */ |
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307 set_relocation_prefix (orig_installprefix, curr_prefix); |
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308 |
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309 free (curr_prefix); |
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310 } |
| 4603 | 311 } |
| 312 | |
| 313 /* Set program_name, based on argv[0], and original installation prefix and | |
| 314 directory, for relocatability. */ | |
| 315 void | |
| 316 set_program_name_and_installdir (const char *argv0, | |
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317 const char *orig_installprefix, |
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318 const char *orig_installdir) |
| 4603 | 319 { |
| 320 const char *argv0_stripped = argv0; | |
| 321 | |
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322 /* Relocatable programs are renamed to .bin by install-reloc. Or, more |
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323 generally, their suffix is changed from $exeext to .bin$exeext. |
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324 Remove the ".bin" here. */ |
| 4603 | 325 { |
| 326 size_t argv0_len = strlen (argv0); | |
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327 const size_t exeext_len = sizeof (EXEEXT) - sizeof (""); |
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328 if (argv0_len > 4 + exeext_len) |
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329 if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0) |
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330 { |
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331 if (sizeof (EXEEXT) > sizeof ("")) |
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332 { |
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333 /* Compare using an inlined copy of c_strncasecmp(), because |
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334 the filenames may have undergone a case conversion since |
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335 they were packaged. In other words, EXEEXT may be ".exe" |
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336 on one system and ".EXE" on another. */ |
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337 static const char exeext[] = EXEEXT; |
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338 const char *s1 = argv0 + argv0_len - exeext_len; |
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339 const char *s2 = exeext; |
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340 for (; *s1 != '\0'; s1++, s2++) |
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341 { |
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342 unsigned char c1 = *s1; |
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343 unsigned char c2 = *s2; |
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344 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1) |
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345 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2)) |
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346 goto done_stripping; |
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347 } |
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348 } |
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349 /* Remove ".bin" before EXEEXT or its equivalent. */ |
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350 { |
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351 char *shorter = (char *) xmalloc (argv0_len - 4 + 1); |
| 4603 | 352 #ifdef NO_XMALLOC |
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Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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353 if (shorter != NULL) |
| 4603 | 354 #endif |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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355 { |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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356 memcpy (shorter, argv0, argv0_len - exeext_len - 4); |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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357 if (sizeof (EXEEXT) > sizeof ("")) |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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358 memcpy (shorter + argv0_len - exeext_len - 4, |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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359 argv0 + argv0_len - exeext_len - 4, |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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360 exeext_len); |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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361 shorter[argv0_len - 4] = '\0'; |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
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362 argv0_stripped = shorter; |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
|
363 } |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
|
364 } |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
|
365 done_stripping: ; |
| 4603 | 366 } |
| 367 } | |
| 368 | |
| 369 set_program_name (argv0_stripped); | |
| 370 | |
| 371 prepare_relocate (orig_installprefix, orig_installdir, argv0); | |
| 372 } | |
| 373 | |
| 374 /* Return the full pathname of the current executable, based on the earlier | |
| 375 call to set_program_name_and_installdir. Return NULL if unknown. */ | |
| 376 char * | |
| 4691 | 377 get_full_program_name (void) |
| 4603 | 378 { |
| 379 return executable_fullname; | |
| 380 } | |
| 381 | |
| 382 #endif |