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
