1 /* Find path of executable.
2    Copyright (C) 1998-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/param.h>
22 #include <ldsodefs.h>
23 
24 #include <dl-dst.h>
25 
26 
27 const char *
_dl_get_origin(void)28 _dl_get_origin (void)
29 {
30   char *result = (char *) -1;
31   /* We use the environment variable LD_ORIGIN_PATH.  If it is set make
32      a copy and strip out trailing slashes.  */
33   if (GLRO(dl_origin_path) != NULL)
34     {
35       size_t len = strlen (GLRO(dl_origin_path));
36       result = (char *) malloc (len + 1);
37       if (result == NULL)
38 	result = (char *) -1;
39       else
40 	{
41 	  char *cp = __mempcpy (result, GLRO(dl_origin_path), len);
42 	  while (cp > result + 1 && cp[-1] == '/')
43 	    --cp;
44 	  *cp = '\0';
45 	}
46     }
47 
48   return result;
49 }
50