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