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67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* Copyright (C) 2002-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <semaphore.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "semaphoreP.h"
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int
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sem_unlink (name)
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const char *name;
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{
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char *fname;
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size_t namelen;
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/* Determine where the shmfs is mounted. */
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__pthread_once (&__namedsem_once, __where_is_shmfs);
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/* If we don't know the mount points there is nothing we can do. Ever. */
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if (mountpoint.dir == NULL)
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{
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__set_errno (ENOSYS);
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return -1;
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}
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/* Construct the filename. */
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while (name[0] == '/')
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++name;
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if (name[0] == '\0')
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{
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/* The name "/" is not supported. */
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__set_errno (ENOENT);
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return -1;
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}
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namelen = strlen (name);
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/* Create the name of the file. */
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fname = (char *) alloca (mountpoint.dirlen + namelen + 1);
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__mempcpy (__mempcpy (fname, mountpoint.dir, mountpoint.dirlen),
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name, namelen + 1);
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/* Now try removing it. */
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int ret = unlink (fname);
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if (ret < 0 && errno == EPERM)
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__set_errno (EACCES);
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return ret;
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}
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