mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 10:50:07 +00:00
42fa1f67d4
use the AT_EXECFN value if it is no absolute path. * sysdeps/unix/sysv/linux/kernel-features.h: Never define __ASSUME_AT_EXECFN.
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* Find path of executable.
|
|
Copyright (C) 1998-2000, 2002, 2004, 2008 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#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];
|
|
const char *str;
|
|
char *result = (char *) -1l;
|
|
int len;
|
|
|
|
str = GLRO(dl_execfn);
|
|
if (str == NULL || str[0] != '/')
|
|
{
|
|
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] != '[')
|
|
str = linkval;
|
|
else
|
|
str = NULL;
|
|
}
|
|
else
|
|
len = strlen (str);
|
|
|
|
if (str == NULL)
|
|
{
|
|
/* 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';
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* We can use this value. */
|
|
assert (str[0] == '/');
|
|
while (len > 1 && str[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, str, len - 1)) = '\0';
|
|
}
|
|
|
|
return result;
|
|
}
|