sysvipc/sys/shm.h

   1 /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_SHM_H
  20 #define _SYS_SHM_H      1
  21
  22 #include <features.h>
  23
  24 #include <unistd.h>             /* for `getpagesize' declaration */
  25 #include <sys/types.h>
  26
  27 /* Get common definition of System V style IPC.  */
  28 #include <sys/ipc.h>
  29
  30 /* Get system dependent definition of `struct shmid_ds' and more.  */
  31 #include <bits/shm.h>
  32
  33
  34 /* Segment low boundary address multiple.  */
  35 #define SHMLBA          (__getpagesize ())
  36
  37 /* The following System V style IPC functions implement a shared memory
  38    facility.  The definition is found in XPG4.2.  */
  39
  40 __BEGIN_DECLS
  41
  42 /* Shared memory control operation.  */
  43 extern int shmctl __P ((int __shmid, int __cmd, struct shmid_ds *__buf));
  44
  45 /* Get shared memory segment.  */
  46 extern int shmget __P ((key_t __key, int __size, int __shmflg));
  47
  48 /* Attach shared memory segment.  */
  49 extern void *shmat __P ((int __shmid, __const void *__shmaddr, int __shmflg));
  50
  51 /* Detach shared memory segment.  */
  52 extern int shmdt __P ((__const void *__shmaddr));
  53
  54 __END_DECLS
  55
  56 #endif /* sys/shm.h */