sysdeps/posix/shm_unlink.c

   1 /* shm_unlink -- remove a POSIX shared memory object.  Generic POSIX version.
   2    Copyright (C) 2001,2002,2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <unistd.h>
  21
  22 #if ! _POSIX_MAPPED_FILES
  23 #include <rt/shm_unlink.c>
  24
  25 #else
  26
  27 #include <errno.h>
  28 #include <sys/mman.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <paths.h>
  32
  33 #define SHMDIR  (_PATH_DEV "shm/")
  34
  35 /* Remove shared memory object.  */
  36 int
  37 shm_unlink (const char *name)
  38 {
  39   size_t namelen;
  40   char *fname;
  41
  42   /* Construct the filename.  */
  43   while (name[0] == '/')
  44     ++name;
  45
  46   if (name[0] == '\0')
  47     {
  48       /* The name "/" is not supported.  */
  49       __set_errno (EINVAL);
  50       return -1;
  51     }
  52
  53   namelen = strlen (name);
  54   fname = (char *) __alloca (sizeof SHMDIR - 1 + namelen + 1);
  55   __mempcpy (__mempcpy (fname, SHMDIR, sizeof SHMDIR - 1),
  56              name, namelen + 1);
  57
  58   return unlink (name);
  59 }
  60
  61 #endif