Mercurial > hg > octave-shane > gnulib-hg
annotate lib/progreloc.c @ 13664:241057e2e60f
fcntl-h: define O_CLOEXEC and O_EXEC if not defined; use new defines
* doc/posix-headers/fcntl.texi (fcntl.h): Document that
O_CLOEXEC is now defined to 0 if it is not defined, like other flags.
Also, O_EXEC is now defined to be O_RDONLY if O_EXEC is not defined.
Similarly for O_SEARCH; this last was already true, but not documented.
* lib/fcntl.in.h (O_CLOEXEC): Define to 0 if not defined.
* lib/dup-safer-flag.c (O_CLOEXEC): Remove now-useless #define.
* lib/dup3.c, lib/pipe2.c, tests/test-dup-safer.c, tests/test-fcntl.c:
Likewise.
* lib/popen-safer.c (open_noinherit): Check whether O_CLOEXEC
is zero, not whether it is defined.
* tests/test-dup3.c, tests/test-pipe2.c (main): Likewise.
* lib/progreloc.c (find_executable): Use O_EXEC rather than O_RDONLY.
* lib/open.c (open): Check for O_SEARCH as well as for O_RDONLY.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 10 Sep 2010 11:55:27 -0700 |
| parents | 758ef73803db |
| children | 3211d36b9926 |
| rev | line source |
|---|---|
| 4603 | 1 /* Provide relocatable programs. |
|
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2 Copyright (C) 2003-2010 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 /* Declare canonicalize_file_name. |
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63 The <stdlib.h> included above may be the system's one, not the gnulib |
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64 one. */ |
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65 extern char * canonicalize_file_name (const char *name); |
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66 |
| 4603 | 67 /* Pathname support. |
| 68 ISSLASH(C) tests whether C is a directory separator character. | |
| 69 IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. | |
| 70 */ | |
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71 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
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72 /* Win32, Cygwin, OS/2, DOS */ |
| 4603 | 73 # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| 74 # define HAS_DEVICE(P) \ | |
| 75 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ | |
| 76 && (P)[1] == ':') | |
| 77 # define IS_PATH_WITH_DIR(P) \ | |
| 78 (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P)) | |
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79 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) |
| 4603 | 80 #else |
| 81 /* Unix */ | |
| 82 # define ISSLASH(C) ((C) == '/') | |
| 83 # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL) | |
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84 # define FILE_SYSTEM_PREFIX_LEN(P) 0 |
| 4603 | 85 #endif |
| 86 | |
| 7863 | 87 /* The results of open() in this file are not used with fchdir, |
| 88 therefore save some unnecessary work in fchdir.c. */ | |
| 89 #undef open | |
| 90 #undef close | |
| 91 | |
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92 /* Use the system functions, not the gnulib overrides in this file. */ |
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93 #undef malloc |
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94 #undef sprintf |
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95 |
| 4603 | 96 #undef set_program_name |
| 97 | |
| 98 | |
| 99 #if ENABLE_RELOCATABLE | |
| 100 | |
| 101 #ifdef __linux__ | |
| 102 /* File descriptor of the executable. | |
| 103 (Only used to verify that we find the correct executable.) */ | |
| 104 static int executable_fd = -1; | |
| 105 #endif | |
| 106 | |
| 107 /* Tests whether a given pathname may belong to the executable. */ | |
| 108 static bool | |
| 109 maybe_executable (const char *filename) | |
| 110 { | |
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111 /* Woe32 lacks the access() function, but Cygwin doesn't. */ |
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112 #if !(defined WIN32_NATIVE && !defined __CYGWIN__) |
| 4603 | 113 if (access (filename, X_OK) < 0) |
| 114 return false; | |
| 115 | |
| 116 #ifdef __linux__ | |
| 117 if (executable_fd >= 0) | |
| 118 { | |
| 119 /* If we already have an executable_fd, check that filename points to | |
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120 the same inode. */ |
| 4603 | 121 struct stat statexe; |
| 122 struct stat statfile; | |
| 123 | |
| 124 if (fstat (executable_fd, &statexe) >= 0) | |
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125 { |
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126 if (stat (filename, &statfile) < 0) |
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127 return false; |
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128 if (!(statfile.st_dev |
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129 && statfile.st_dev == statexe.st_dev |
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130 && statfile.st_ino == statexe.st_ino)) |
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131 return false; |
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132 } |
| 4603 | 133 } |
| 134 #endif | |
| 135 #endif | |
| 136 | |
| 137 return true; | |
| 138 } | |
| 139 | |
| 140 /* Determine the full pathname of the current executable, freshly allocated. | |
| 141 Return NULL if unknown. | |
| 142 Guaranteed to work on Linux and Woe32. Likely to work on the other | |
| 143 Unixes (maybe except BeOS), under most conditions. */ | |
| 144 static char * | |
| 145 find_executable (const char *argv0) | |
| 146 { | |
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147 #if defined WIN32_NATIVE || defined __CYGWIN__ |
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148 char location[MAX_PATH]; |
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149 int length = GetModuleFileName (NULL, location, sizeof (location)); |
| 4603 | 150 if (length < 0) |
| 151 return NULL; | |
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152 if (!IS_PATH_WITH_DIR (location)) |
| 4603 | 153 /* Shouldn't happen. */ |
| 154 return NULL; | |
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155 { |
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156 #if defined __CYGWIN__ |
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157 /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like |
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158 implementation: readlink of "/proc/self/exe". But using the |
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159 result of the Win32 system call is simpler and is consistent with the |
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160 code in relocatable.c. */ |
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161 /* On Cygwin, we need to convert paths coming from Win32 system calls |
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162 to the Unix-like slashified notation. */ |
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163 static char location_as_posix_path[2 * MAX_PATH]; |
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164 /* There's no error return defined for cygwin_conv_to_posix_path. |
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165 See cygwin-api/func-cygwin-conv-to-posix-path.html. |
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166 Does it overflow the buffer of expected size MAX_PATH or does it |
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167 truncate the path? I don't know. Let's catch both. */ |
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168 cygwin_conv_to_posix_path (location, location_as_posix_path); |
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169 location_as_posix_path[MAX_PATH - 1] = '\0'; |
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170 if (strlen (location_as_posix_path) >= MAX_PATH - 1) |
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171 /* A sign of buffer overflow or path truncation. */ |
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172 return NULL; |
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173 /* Call canonicalize_file_name, because Cygwin supports symbolic links. */ |
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174 return canonicalize_file_name (location_as_posix_path); |
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175 #else |
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176 return xstrdup (location); |
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177 #endif |
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178 } |
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179 #else /* Unix && !Cygwin */ |
| 4603 | 180 #ifdef __linux__ |
| 181 /* The executable is accessible as /proc/<pid>/exe. In newer Linux | |
| 182 versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink | |
| 183 to the true pathname; older Linux versions give only device and ino, | |
| 184 enclosed in brackets, which we cannot use here. */ | |
| 185 { | |
| 186 char *link; | |
| 187 | |
| 188 link = xreadlink ("/proc/self/exe"); | |
| 189 if (link != NULL && link[0] != '[') | |
| 190 return link; | |
| 191 if (executable_fd < 0) | |
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192 executable_fd = open ("/proc/self/exe", O_EXEC, 0); |
| 4603 | 193 |
| 194 { | |
| 195 char buf[6+10+5]; | |
| 196 sprintf (buf, "/proc/%d/exe", getpid ()); | |
| 197 link = xreadlink (buf); | |
| 198 if (link != NULL && link[0] != '[') | |
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199 return link; |
| 4603 | 200 if (executable_fd < 0) |
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201 executable_fd = open (buf, O_EXEC, 0); |
| 4603 | 202 } |
| 203 } | |
| 204 #endif | |
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205 #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH |
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206 /* On MacOS X 10.2 or newer, the function |
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207 int _NSGetExecutablePath (char *buf, uint32_t *bufsize); |
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208 can be used to retrieve the executable's full path. */ |
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209 char location[4096]; |
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210 unsigned int length = sizeof (location); |
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211 if (_NSGetExecutablePath (location, &length) == 0 |
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212 && location[0] == '/') |
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213 return canonicalize_file_name (location); |
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214 #endif |
| 4603 | 215 /* Guess the executable's full path. We assume the executable has been |
| 216 called via execlp() or execvp() with properly set up argv[0]. The | |
| 217 login(1) convention to add a '-' prefix to argv[0] is not supported. */ | |
| 218 { | |
| 219 bool has_slash = false; | |
| 220 { | |
| 221 const char *p; | |
| 222 for (p = argv0; *p; p++) | |
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223 if (*p == '/') |
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224 { |
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225 has_slash = true; |
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226 break; |
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227 } |
| 4603 | 228 } |
| 229 if (!has_slash) | |
| 230 { | |
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231 /* exec searches paths without slashes in the directory list given |
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232 by $PATH. */ |
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233 const char *path = getenv ("PATH"); |
| 4603 | 234 |
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235 if (path != NULL) |
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236 { |
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237 const char *p; |
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238 const char *p_next; |
| 4603 | 239 |
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240 for (p = path; *p; p = p_next) |
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241 { |
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242 const char *q; |
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243 size_t p_len; |
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244 char *concat_name; |
| 4603 | 245 |
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246 for (q = p; *q; q++) |
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247 if (*q == ':') |
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248 break; |
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249 p_len = q - p; |
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250 p_next = (*q == '\0' ? q : q + 1); |
| 4603 | 251 |
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252 /* We have a path item at p, of length p_len. |
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253 Now concatenate the path item and argv0. */ |
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254 concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2); |
| 4603 | 255 #ifdef NO_XMALLOC |
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256 if (concat_name == NULL) |
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257 return NULL; |
| 4603 | 258 #endif |
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259 if (p_len == 0) |
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260 /* An empty PATH element designates the current directory. */ |
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261 strcpy (concat_name, argv0); |
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262 else |
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263 { |
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264 memcpy (concat_name, p, p_len); |
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265 concat_name[p_len] = '/'; |
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266 strcpy (concat_name + p_len + 1, argv0); |
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267 } |
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268 if (maybe_executable (concat_name)) |
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269 return canonicalize_file_name (concat_name); |
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270 free (concat_name); |
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271 } |
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272 } |
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273 /* Not found in the PATH, assume the current directory. */ |
| 4603 | 274 } |
| 275 /* exec treats paths containing slashes as relative to the current | |
| 276 directory. */ | |
| 277 if (maybe_executable (argv0)) | |
| 278 return canonicalize_file_name (argv0); | |
| 279 } | |
| 280 /* No way to find the executable. */ | |
| 281 return NULL; | |
| 282 #endif | |
| 283 } | |
| 284 | |
| 285 /* Full pathname of executable, or NULL. */ | |
| 286 static char *executable_fullname; | |
| 287 | |
| 288 static void | |
| 289 prepare_relocate (const char *orig_installprefix, const char *orig_installdir, | |
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290 const char *argv0) |
| 4603 | 291 { |
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292 char *curr_prefix; |
| 4603 | 293 |
| 294 /* Determine the full pathname of the current executable. */ | |
| 295 executable_fullname = find_executable (argv0); | |
| 296 | |
| 297 /* Determine the current installation prefix from it. */ | |
| 298 curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir, | |
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299 executable_fullname); |
| 4603 | 300 if (curr_prefix != NULL) |
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301 { |
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302 /* Now pass this prefix to all copies of the relocate.c source file. */ |
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303 set_relocation_prefix (orig_installprefix, curr_prefix); |
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304 |
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305 free (curr_prefix); |
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306 } |
| 4603 | 307 } |
| 308 | |
| 309 /* Set program_name, based on argv[0], and original installation prefix and | |
| 310 directory, for relocatability. */ | |
| 311 void | |
| 312 set_program_name_and_installdir (const char *argv0, | |
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313 const char *orig_installprefix, |
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314 const char *orig_installdir) |
| 4603 | 315 { |
| 316 const char *argv0_stripped = argv0; | |
| 317 | |
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318 /* Relocatable programs are renamed to .bin by install-reloc. Or, more |
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319 generally, their suffix is changed from $exeext to .bin$exeext. |
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320 Remove the ".bin" here. */ |
| 4603 | 321 { |
| 322 size_t argv0_len = strlen (argv0); | |
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323 const size_t exeext_len = sizeof (EXEEXT) - sizeof (""); |
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324 if (argv0_len > 4 + exeext_len) |
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325 if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0) |
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326 { |
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327 if (sizeof (EXEEXT) > sizeof ("")) |
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328 { |
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329 /* Compare using an inlined copy of c_strncasecmp(), because |
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330 the filenames may have undergone a case conversion since |
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331 they were packaged. In other words, EXEEXT may be ".exe" |
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332 on one system and ".EXE" on another. */ |
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333 static const char exeext[] = EXEEXT; |
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334 const char *s1 = argv0 + argv0_len - exeext_len; |
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335 const char *s2 = exeext; |
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336 for (; *s1 != '\0'; s1++, s2++) |
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337 { |
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338 unsigned char c1 = *s1; |
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339 unsigned char c2 = *s2; |
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340 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1) |
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341 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2)) |
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342 goto done_stripping; |
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343 } |
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344 } |
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345 /* Remove ".bin" before EXEEXT or its equivalent. */ |
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346 { |
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347 char *shorter = (char *) xmalloc (argv0_len - 4 + 1); |
| 4603 | 348 #ifdef NO_XMALLOC |
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349 if (shorter != NULL) |
| 4603 | 350 #endif |
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351 { |
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352 memcpy (shorter, argv0, argv0_len - exeext_len - 4); |
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353 if (sizeof (EXEEXT) > sizeof ("")) |
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354 memcpy (shorter + argv0_len - exeext_len - 4, |
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355 argv0 + argv0_len - exeext_len - 4, |
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changeset
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356 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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357 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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358 argv0_stripped = shorter; |
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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 } |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
|
360 } |
|
e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
12049
diff
changeset
|
361 done_stripping: ; |
| 4603 | 362 } |
| 363 } | |
| 364 | |
| 365 set_program_name (argv0_stripped); | |
| 366 | |
| 367 prepare_relocate (orig_installprefix, orig_installdir, argv0); | |
| 368 } | |
| 369 | |
| 370 /* Return the full pathname of the current executable, based on the earlier | |
| 371 call to set_program_name_and_installdir. Return NULL if unknown. */ | |
| 372 char * | |
| 4691 | 373 get_full_program_name (void) |
| 4603 | 374 { |
| 375 return executable_fullname; | |
| 376 } | |
| 377 | |
| 378 #endif |