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/* Find path of executable.
Copyright (C) 1998, 1999, 2000, 2002, 2004 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>
const char *_self_program_name_from_auxv attribute_hidden;
static int
_dl_self_name(char *buf, int buflen)
{
int len, wdlen;
/* try /proc/self/exe symlink. */
len = __readlink("/proc/self/exe", buf, buflen);
if (len > 0 && buf[0] == '/')
return len;
if (!_self_program_name_from_auxv)
return -1;
len = strlen(_self_program_name_from_auxv);
if (len > 0 && _self_program_name_from_auxv[0] == '/')
{
/* absolute file name */
if (len < buflen)
{
strcpy(buf, _self_program_name_from_auxv);
return len;
}
memcpy(buf, _self_program_name_from_auxv, buflen);
buf[buflen - 1] = 0;
return buflen - 1;
};
/* relative file name, do our best */
if (NULL == __getcwd(buf, buflen))
return -1;
wdlen = strlen(buf);
buf[wdlen] = '/';
if ((wdlen + len + 1) < buflen)
{
strcpy(buf + wdlen + 1, _self_program_name_from_auxv);
return wdlen + len + 1;
}
memcpy(buf + wdlen + 1, _self_program_name_from_auxv, buflen - wdlen - 1);
buf[buflen - 1] = 0;
return buflen - 1;
}
const char *
_dl_get_origin (void)
{
char linkval[2*PATH_MAX];
char *result;
int len;
len = _dl_self_name(linkval, sizeof(linkval));
if (len > 0)
{
/* We can use this value. */
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;
}
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