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glibc/sysdeps/unix/sysv/linux/dl-origin.c
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/* Find path of executable. | |
Copyright (C) 1998-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <assert.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/param.h> | |
#include <ldsodefs.h> | |
#include <sysdep.h> | |
#include <dl-dst.h> | |
/* On Linux >= 2.1 systems which have the dcache implementation we can get | |
the path of the application from the /proc/self/exe symlink. Try this | |
first and fall back on the generic method if necessary. */ | |
const char * | |
_dl_get_origin (void) | |
{ | |
char linkval[PATH_MAX]; | |
char *result; | |
int len; | |
INTERNAL_SYSCALL_DECL (err); | |
len = INTERNAL_SYSCALL (readlink, err, 3, "/proc/self/exe", linkval, | |
sizeof (linkval)); | |
if (! INTERNAL_SYSCALL_ERROR_P (len, err) && len > 0 && linkval[0] != '[') | |
{ | |
/* We can use this value. */ | |
assert (linkval[0] == '/'); | |
while (len > 1 && linkval[len - 1] != '/') | |
--len; | |
result = (char *) malloc (len + 1); | |
if (result == NULL) | |
result = (char *) -1; | |
else if (len == 1) | |
memcpy (result, "/", 2); | |
else | |
*((char *) __mempcpy (result, linkval, len - 1)) = '\0'; | |
} | |
else | |
{ | |
result = (char *) -1; | |
/* We use the environment variable LD_ORIGIN_PATH. If it is set make | |
a copy and strip out trailing slashes. */ | |
if (GLRO(dl_origin_path) != NULL) | |
{ | |
size_t len = strlen (GLRO(dl_origin_path)); | |
result = (char *) malloc (len + 1); | |
if (result == NULL) | |
result = (char *) -1; | |
else | |
{ | |
char *cp = __mempcpy (result, GLRO(dl_origin_path), len); | |
while (cp > result + 1 && cp[-1] == '/') | |
--cp; | |
*cp = '\0'; | |
} | |
} | |
} | |
return result; | |
} |