1 /* unlink-if-ordinary.c - remove link to a file unless it is special
2 Copyright (C) 2004 Free Software Foundation, Inc.
3
4 This file is part of the libiberty library. This library is free
5 software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This 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
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNU CC; see the file COPYING. If not, write to
17 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19 As a special exception, if you link this library with files
20 compiled with a GNU compiler to produce an executable, this does not cause
21 the resulting executable to be covered by the GNU General Public License.
22 This exception does not however invalidate any other reasons why
23 the executable file might be covered by the GNU General Public License. */
24
25 /*
26
27 @deftypefn Supplemental int unlink_if_ordinary (const char*)
28
29 Unlinks the named file, unless it is special (e.g. a device file).
30 Returns 0 when the file was unlinked, a negative value (and errno set) when
31 there was an error deleting the file, and a positive value if no attempt
32 was made to unlink the file because it is special.
33
34 @end deftypefn
35
36 */
37
38 #ifdef HAVE_CONFIG_H
39 #include "config.h"
40 #endif
41
42 #ifdef HAVE_UNISTD_H
43 #include <unistd.h>
44 #endif
45 #if HAVE_SYS_STAT_H
46 #include <sys/stat.h>
47 #endif
48
49 #include "libiberty.h"
50
51 #ifndef S_ISLNK
52 #ifdef S_IFLNK
53 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
54 #else
55 #define S_ISLNK(m) 0
56 #define lstat stat
57 #endif
58 #endif
59
60 int
unlink_if_ordinary(name)61 unlink_if_ordinary (name)
62 const char *name;
63 {
64 struct stat st;
65
66 if (lstat (name, &st) == 0
67 && (S_ISREG (st.st_mode) || S_ISLNK (st.st_mode)))
68 return unlink (name);
69
70 return 1;
71 }
72