1155086Spjd/* unlink-if-ordinary.c - remove link to a file unless it is special
2155086Spjd   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
3155086Spjd
4155086SpjdThis file is part of the libiberty library.  This library is free
5155086Spjdsoftware; you can redistribute it and/or modify it under the
6155086Spjdterms of the GNU General Public License as published by the
7155086SpjdFree Software Foundation; either version 2, or (at your option)
8155086Spjdany later version.
9155086Spjd
10155086SpjdThis library is distributed in the hope that it will be useful,
11155086Spjdbut WITHOUT ANY WARRANTY; without even the implied warranty of
12155086SpjdMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13155086SpjdGNU General Public License for more details.
14155086Spjd
15155086SpjdYou should have received a copy of the GNU General Public License
16155086Spjdalong with GNU CC; see the file COPYING.  If not, write to
17155086Spjdthe Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
18155086Spjd
19155086SpjdAs a special exception, if you link this library with files
20155086Spjdcompiled with a GNU compiler to produce an executable, this does not cause
21155086Spjdthe resulting executable to be covered by the GNU General Public License.
22155086SpjdThis exception does not however invalidate any other reasons why
23155086Spjdthe executable file might be covered by the GNU General Public License. */
24155086Spjd
25155086Spjd/*
26155086Spjd
27155086Spjd@deftypefn Supplemental int unlink_if_ordinary (const char*)
28155086Spjd
29155086SpjdUnlinks the named file, unless it is special (e.g. a device file).
30155086SpjdReturns 0 when the file was unlinked, a negative value (and errno set) when
31155086Spjdthere was an error deleting the file, and a positive value if no attempt
32155086Spjdwas made to unlink the file because it is special.
33155086Spjd
34155086Spjd@end deftypefn
35155086Spjd
36155086Spjd*/
37155086Spjd
38155086Spjd#ifdef HAVE_CONFIG_H
39#include "config.h"
40#endif
41
42#include <sys/types.h>
43
44#ifdef HAVE_UNISTD_H
45#include <unistd.h>
46#endif
47#if HAVE_SYS_STAT_H
48#include <sys/stat.h>
49#endif
50
51#include "libiberty.h"
52
53#ifndef S_ISLNK
54#ifdef S_IFLNK
55#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
56#else
57#define S_ISLNK(m) 0
58#define lstat stat
59#endif
60#endif
61
62int
63unlink_if_ordinary (const char *name)
64{
65  struct stat st;
66
67  if (lstat (name, &st) == 0
68      && (S_ISREG (st.st_mode) || S_ISLNK (st.st_mode)))
69    return unlink (name);
70
71  return 1;
72}
73