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glibc  2.9
shm_unlink.c
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00001 /* shm_unlink -- remove a POSIX shared memory object.  Generic POSIX version.
00002    Copyright (C) 2001,2002,2005 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <unistd.h>
00021 
00022 #if ! _POSIX_MAPPED_FILES
00023 #include <rt/shm_unlink.c>
00024 
00025 #else
00026 
00027 #include <errno.h>
00028 #include <sys/mman.h>
00029 #include <string.h>
00030 #include <stdlib.h>
00031 #include <paths.h>
00032 
00033 #define SHMDIR       (_PATH_DEV "shm/")
00034 
00035 /* Remove shared memory object.  */
00036 int
00037 shm_unlink (const char *name)
00038 {
00039   size_t namelen;
00040   char *fname;
00041 
00042   /* Construct the filename.  */
00043   while (name[0] == '/')
00044     ++name;
00045 
00046   if (name[0] == '\0')
00047     {
00048       /* The name "/" is not supported.  */
00049       __set_errno (EINVAL);
00050       return -1;
00051     }
00052 
00053   namelen = strlen (name);
00054   fname = (char *) __alloca (sizeof SHMDIR - 1 + namelen + 1);
00055   __mempcpy (__mempcpy (fname, SHMDIR, sizeof SHMDIR - 1),
00056             name, namelen + 1);
00057 
00058   return unlink (name);
00059 }
00060 
00061 #endif