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1 /* unlink-if-ordinary.c - remove link to a file unless it is special
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2 Copyright (C) 2004-2020 Free Software Foundation, Inc.
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3
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4 This file is part of the libiberty library. This library is free
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5 software; you can redistribute it and/or modify it under the
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6 terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with GNU CC; see the file COPYING. If not, write to
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17 the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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18
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19 As a special exception, if you link this library with files
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20 compiled with a GNU compiler to produce an executable, this does not cause
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21 the resulting executable to be covered by the GNU General Public License.
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22 This exception does not however invalidate any other reasons why
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23 the executable file might be covered by the GNU General Public License. */
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24
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25 /*
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26
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27 @deftypefn Supplemental int unlink_if_ordinary (const char*)
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28
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29 Unlinks the named file, unless it is special (e.g. a device file).
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30 Returns 0 when the file was unlinked, a negative value (and errno set) when
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31 there was an error deleting the file, and a positive value if no attempt
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32 was made to unlink the file because it is special.
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33
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34 @end deftypefn
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35
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36 */
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37
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38 #ifdef HAVE_CONFIG_H
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39 #include "config.h"
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40 #endif
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41
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42 #include <sys/types.h>
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43
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44 #ifdef HAVE_UNISTD_H
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45 #include <unistd.h>
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46 #endif
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47 #if HAVE_SYS_STAT_H
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48 #include <sys/stat.h>
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49 #endif
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50
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51 #include "libiberty.h"
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52
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53 #ifndef S_ISLNK
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54 #ifdef S_IFLNK
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55 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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56 #else
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57 #define S_ISLNK(m) 0
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58 #define lstat stat
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59 #endif
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60 #endif
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61
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62 int
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63 unlink_if_ordinary (const char *name)
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64 {
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65 struct stat st;
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66
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67 if (lstat (name, &st) == 0
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68 && (S_ISREG (st.st_mode) || S_ISLNK (st.st_mode)))
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69 return unlink (name);
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70
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71 return 1;
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72 }
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