1 /* Find path of executable.
2 Copyright (C) 1998 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* On Linux >= 2.1 systems which have the dcache implementation we can get
22 the path of the application from the /proc/self/exe symlink. Try this
23 first and fall back on the generic method if necessary. */
24 extern const char *_dl_origin_path
;
26 static inline const char *
29 char linkval
[PATH_MAX
];
32 if (readlink ("/proc/self/exe", linkval
, PATH_MAX
) != -1
35 /* We can use this value. */
36 char *last_slash
= strrchr (linkval
, '/');
37 result
= (char *) malloc (last_slash
- linkval
+ 1);
41 *((char *) __mempcpy (result
, linkval
, last_slash
- linkval
)) = '\0';
46 /* We use te environment variable LD_ORIGIN_PATH. If it is set make
47 a copy and strip out trailing slashes. */
48 if (_dl_origin_path
!= NULL
)
50 size_t len
= strlen (_dl_origin_path
);
51 result
= malloc (len
+ 1);
56 char *cp
= __mempcpy (result
, _dl_origin_path
, len
);
57 while (cp
> result
&& cp
[-1] == '/')