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
27const char *
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 (size: 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

source code of glibc/elf/dl-origin.c