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glibc  2.9
dl-origin.c
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00001 /* Find path of executable.
00002    Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <stdlib.h>
00022 #include <string.h>
00023 #include <sys/param.h>
00024 #include <ldsodefs.h>
00025 
00026 #include <dl-dst.h>
00027 
00028 
00029 const char *
00030 _dl_get_origin (void)
00031 {
00032   char *result = (char *) -1;
00033   /* We use the environment variable LD_ORIGIN_PATH.  If it is set make
00034      a copy and strip out trailing slashes.  */
00035   if (GLRO(dl_origin_path) != NULL)
00036     {
00037       size_t len = strlen (GLRO(dl_origin_path));
00038       result = (char *) malloc (len + 1);
00039       if (result == NULL)
00040        result = (char *) -1;
00041       else
00042        {
00043          char *cp = __mempcpy (result, GLRO(dl_origin_path), len);
00044          while (cp > result + 1 && cp[-1] == '/')
00045            --cp;
00046          *cp = '\0';
00047        }
00048     }
00049 
00050   return result;
00051 }