1  /* unlink-if-ordinary.c - remove link to a file unless it is special
       2     Copyright (C) 2004-2023 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  }