sysdeps/posix/shm_unlink.c

   1 /* shm_unlink -- remove a POSIX shared memory object.  Generic POSIX version.
   2    Copyright (C) 2001-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <unistd.h>
  20
  21 #if ! _POSIX_MAPPED_FILES
  22 #include <rt/shm_unlink.c>
  23
  24 #else
  25
  26 #include <errno.h>
  27 #include <sys/mman.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <paths.h>
  31
  32 #define SHMDIR  (_PATH_DEV "shm/")
  33
  34 /* Remove shared memory object.  */
  35 int
  36 shm_unlink (const char *name)
  37 {
  38   size_t namelen;
  39   char *fname;
  40
  41   /* Construct the filename.  */
  42   while (name[0] == '/')
  43     ++name;
  44
  45   if (name[0] == '\0')
  46     {
  47       /* The name "/" is not supported.  */
  48       __set_errno (EINVAL);
  49       return -1;
  50     }
  51
  52   namelen = strlen (name);
  53   fname = (char *) __alloca (sizeof SHMDIR - 1 + namelen + 1);
  54   __mempcpy (__mempcpy (fname, SHMDIR, sizeof SHMDIR - 1),
  55              name, namelen + 1);
  56
  57   return unlink (name);
  58 }
  59
  60 #endif