73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/* unlink-if-ordinary.c - remove link to a file unless it is special
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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This file is part of the libiberty library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/*
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@deftypefn Supplemental int unlink_if_ordinary (const char*)
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Unlinks the named file, unless it is special (e.g. a device file).
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Returns 0 when the file was unlinked, a negative value (and errno set) when
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there was an error deleting the file, and a positive value if no attempt
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was made to unlink the file because it is special.
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@end deftypefn
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include "libiberty.h"
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#ifndef S_ISLNK
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#ifdef S_IFLNK
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#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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#else
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#define S_ISLNK(m) 0
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#define lstat stat
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#endif
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#endif
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int
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unlink_if_ordinary (const char *name)
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{
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struct stat st;
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if (lstat (name, &st) == 0
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&& (S_ISREG (st.st_mode) || S_ISLNK (st.st_mode)))
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return unlink (name);
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return 1;
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}
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