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      1 /* unlink-if-ordinary.c - remove link to a file unless it is special
      2    Copyright (C) 2004, 2005 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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 #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 
     62 int
     63 unlink_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