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1/* Find path of executable.
2 Copyright (C) 1998-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <assert.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
24#include <fcntl.h>
25#include <sys/param.h>
26#include <ldsodefs.h>
27#include <sysdep.h>
28
29#include <dl-dst.h>
30
31/* On Linux >= 2.1 systems which have the dcache implementation we can get
32 the path of the application from the /proc/self/exe symlink. Try this
33 first and fall back on the generic method if necessary. */
34
35const char *
36_dl_get_origin (void)
37{
38 char linkval[PATH_MAX];
39 char *result;
40 int len;
41 INTERNAL_SYSCALL_DECL (err);
42
43 len = INTERNAL_SYSCALL (readlinkat, err, 4, AT_FDCWD, "/proc/self/exe",
44 linkval, sizeof (linkval));
45 if (! INTERNAL_SYSCALL_ERROR_P (len, err) && len > 0 && linkval[0] != '[')
46 {
47 /* We can use this value. */
48 assert (linkval[0] == '/');
49 while (len > 1 && linkval[len - 1] != '/')
50 --len;
51 result = (char *) malloc (len + 1);
52 if (result == NULL)
53 result = (char *) -1;
54 else if (len == 1)
55 memcpy (result, "/", 2);
56 else
57 *((char *) __mempcpy (result, linkval, len - 1)) = '\0';
58 }
59 else
60 {
61 result = (char *) -1;
62 /* We use the environment variable LD_ORIGIN_PATH. If it is set make
63 a copy and strip out trailing slashes. */
64 if (GLRO(dl_origin_path) != NULL)
65 {
66 size_t len = strlen (GLRO(dl_origin_path));
67 result = (char *) malloc (len + 1);
68 if (result == NULL)
69 result = (char *) -1;
70 else
71 {
72 char *cp = __mempcpy (result, GLRO(dl_origin_path), len);
73 while (cp > result + 1 && cp[-1] == '/')
74 --cp;
75 *cp = '\0';
76 }
77 }
78 }
79
80 return result;
81}
82

Warning: That file was not part of the compilation database. It may have many parsing errors.