1 /* Provide relocatable programs.
2 Copyright (C) 2003-2006 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2003.
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)
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.
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. */
35 /* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer. */
36 #if HAVE_MACH_O_DYLD_H
37 # include <mach-o/dyld.h>
40 #if defined _WIN32 || defined __WIN32__
44 #if defined WIN32_NATIVE || defined __CYGWIN__
45 # define WIN32_LEAN_AND_MEAN
49 #include "xreadlink.h"
50 #include "canonicalize.h"
51 #include "relocatable.h"
54 # define xmalloc malloc
55 # define xstrdup strdup
61 ISSLASH(C) tests whether C is a directory separator character.
62 IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
64 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
65 /* Win32, Cygwin, OS/2, DOS */
66 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
67 # define HAS_DEVICE(P) \
68 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
70 # define IS_PATH_WITH_DIR(P) \
71 (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
72 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
75 # define ISSLASH(C) ((C) == '/')
76 # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
77 # define FILE_SYSTEM_PREFIX_LEN(P) 0
80 #undef set_program_name
83 #if ENABLE_RELOCATABLE
86 /* File descriptor of the executable.
87 (Only used to verify that we find the correct executable.) */
88 static int executable_fd = -1;
91 /* Tests whether a given pathname may belong to the executable. */
93 maybe_executable (const char *filename)
95 /* Woe32 lacks the access() function, but Cygwin doesn't. */
96 #if !(defined WIN32_NATIVE && !defined __CYGWIN__)
97 if (access (filename, X_OK) < 0)
101 if (executable_fd >= 0)
103 /* If we already have an executable_fd, check that filename points to
106 struct stat statfile;
108 if (fstat (executable_fd, &statexe) >= 0)
110 if (stat (filename, &statfile) < 0)
112 if (!(statfile.st_dev
113 && statfile.st_dev == statexe.st_dev
114 && statfile.st_ino == statexe.st_ino))
124 /* Determine the full pathname of the current executable, freshly allocated.
125 Return NULL if unknown.
126 Guaranteed to work on Linux and Woe32. Likely to work on the other
127 Unixes (maybe except BeOS), under most conditions. */
129 find_executable (const char *argv0)
131 #if defined WIN32_NATIVE || defined __CYGWIN__
132 char location[MAX_PATH];
133 int length = GetModuleFileName (NULL, location, sizeof (location));
136 if (!IS_PATH_WITH_DIR (location))
137 /* Shouldn't happen. */
140 #if defined __CYGWIN__
141 /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like
142 implementation: readlink of "/proc/self/exe". But using the
143 result of the Win32 system call is simpler and is consistent with the
144 code in relocatable.c. */
145 /* On Cygwin, we need to convert paths coming from Win32 system calls
146 to the Unix-like slashified notation. */
147 static char location_as_posix_path[2 * MAX_PATH];
148 /* There's no error return defined for cygwin_conv_to_posix_path.
149 See cygwin-api/func-cygwin-conv-to-posix-path.html.
150 Does it overflow the buffer of expected size MAX_PATH or does it
151 truncate the path? I don't know. Let's catch both. */
152 cygwin_conv_to_posix_path (location, location_as_posix_path);
153 location_as_posix_path[MAX_PATH - 1] = '\0';
154 if (strlen (location_as_posix_path) >= MAX_PATH - 1)
155 /* A sign of buffer overflow or path truncation. */
157 /* Call canonicalize_file_name, because Cygwin supports symbolic links. */
158 return canonicalize_file_name (location_as_posix_path);
160 return xstrdup (location);
163 #else /* Unix && !Cygwin */
165 /* The executable is accessible as /proc/<pid>/exe. In newer Linux
166 versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink
167 to the true pathname; older Linux versions give only device and ino,
168 enclosed in brackets, which we cannot use here. */
172 link = xreadlink ("/proc/self/exe");
173 if (link != NULL && link[0] != '[')
175 if (executable_fd < 0)
176 executable_fd = open ("/proc/self/exe", O_RDONLY, 0);
180 sprintf (buf, "/proc/%d/exe", getpid ());
181 link = xreadlink (buf);
182 if (link != NULL && link[0] != '[')
184 if (executable_fd < 0)
185 executable_fd = open (buf, O_RDONLY, 0);
189 #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
190 /* On MacOS X 10.2 or newer, the function
191 int _NSGetExecutablePath (char *buf, unsigned long *bufsize);
192 can be used to retrieve the executable's full path. */
194 unsigned long length = sizeof (location);
195 if (_NSGetExecutablePath (location, &length) == 0
196 && location[0] == '/')
197 return canonicalize_file_name (location);
199 /* Guess the executable's full path. We assume the executable has been
200 called via execlp() or execvp() with properly set up argv[0]. The
201 login(1) convention to add a '-' prefix to argv[0] is not supported. */
203 bool has_slash = false;
206 for (p = argv0; *p; p++)
215 /* exec searches paths without slashes in the directory list given
217 const char *path = getenv ("PATH");
224 for (p = path; *p; p = p_next)
234 p_next = (*q == '\0' ? q : q + 1);
236 /* We have a path item at p, of length p_len.
237 Now concatenate the path item and argv0. */
238 concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2);
240 if (concat_name == NULL)
244 /* An empty PATH element designates the current directory. */
245 strcpy (concat_name, argv0);
248 memcpy (concat_name, p, p_len);
249 concat_name[p_len] = '/';
250 strcpy (concat_name + p_len + 1, argv0);
252 if (maybe_executable (concat_name))
253 return canonicalize_file_name (concat_name);
257 /* Not found in the PATH, assume the current directory. */
259 /* exec treats paths containing slashes as relative to the current
261 if (maybe_executable (argv0))
262 return canonicalize_file_name (argv0);
264 /* No way to find the executable. */
269 /* Full pathname of executable, or NULL. */
270 static char *executable_fullname;
273 prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
276 const char *curr_prefix;
278 /* Determine the full pathname of the current executable. */
279 executable_fullname = find_executable (argv0);
281 /* Determine the current installation prefix from it. */
282 curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir,
283 executable_fullname);
284 if (curr_prefix != NULL)
285 /* Now pass this prefix to all copies of the relocate.c source file. */
286 set_relocation_prefix (orig_installprefix, curr_prefix);
289 /* Set program_name, based on argv[0], and original installation prefix and
290 directory, for relocatability. */
292 set_program_name_and_installdir (const char *argv0,
293 const char *orig_installprefix,
294 const char *orig_installdir)
296 const char *argv0_stripped = argv0;
298 /* Relocatable programs are renamed to .bin by install-reloc. Or, more
299 generally, their suffix is changed from $exeext to .bin$exeext.
300 Remove the ".bin" here. */
302 size_t argv0_len = strlen (argv0);
303 const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
304 if (argv0_len > 4 + exeext_len)
305 if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0)
307 if (sizeof (EXEEXT) > sizeof (""))
309 /* Compare using an inlined copy of c_strncasecmp(), because
310 the filenames may have undergone a case conversion since
311 they were packaged. In other words, EXEEXT may be ".exe"
312 on one system and ".EXE" on another. */
313 static const char exeext[] = EXEEXT;
314 const char *s1 = argv0 + argv0_len - exeext_len;
315 const char *s2 = exeext;
316 for (; *s1 != '\0'; s1++, s2++)
318 unsigned char c1 = *s1;
319 unsigned char c2 = *s2;
320 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
321 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
325 /* Remove ".bin" before EXEEXT or its equivalent. */
327 char *shorter = (char *) xmalloc (argv0_len - 4 + 1);
332 memcpy (shorter, argv0, argv0_len - exeext_len - 4);
333 if (sizeof (EXEEXT) > sizeof (""))
334 memcpy (shorter + argv0_len - exeext_len - 4,
335 argv0 + argv0_len - exeext_len - 4,
337 shorter[argv0_len - 4] = '\0';
338 argv0_stripped = shorter;
345 set_program_name (argv0_stripped);
347 prepare_relocate (orig_installprefix, orig_installdir, argv0);
350 /* Return the full pathname of the current executable, based on the earlier
351 call to set_program_name_and_installdir. Return NULL if unknown. */
353 get_full_program_name (void)
355 return executable_fullname;