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sourceware.org Git - glibc.git/blob - sysdeps/unix/sysv/linux/dl-origin.c
f7512340a13b19eef9e7fb875e5caa97ad5bbc7f
1 /* Find path of executable.
2 Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <sys/param.h>
30 /* On Linux >= 2.1 systems which have the dcache implementation we can get
31 the path of the application from the /proc/self/exe symlink. Try this
32 first and fall back on the generic method if necessary. */
37 char linkval
[PATH_MAX
];
41 if ((len
= __readlink ("/proc/self/exe", linkval
, sizeof (linkval
))) > 0
44 /* We can use this value. */
45 assert (linkval
[0] == '/');
46 while (len
> 1 && linkval
[len
- 1] != '/')
48 result
= (char *) malloc (len
+ 1);
52 memcpy (result
, "/", 2);
54 *((char *) __mempcpy (result
, linkval
, len
- 1)) = '\0';
59 /* We use the environment variable LD_ORIGIN_PATH. If it is set make
60 a copy and strip out trailing slashes. */
61 if (GLRO(dl_origin_path
) != NULL
)
63 size_t len
= strlen (GLRO(dl_origin_path
));
64 result
= (char *) malloc (len
+ 1);
69 char *cp
= __mempcpy (result
, GLRO(dl_origin_path
), len
);
70 while (cp
> result
+ 1 && cp
[-1] == '/')
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