1/* Copyright (C) 1995-2025 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 Lesser General Public
 6   License as published by the Free Software Foundation; either
 7   version 2.1 of the 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   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#ifndef _SYS_SHM_H
19#define _SYS_SHM_H	1
20
21#include <features.h>
22
23#define __need_size_t
24#include <stddef.h>
25
26/* Get common definition of System V style IPC.  */
27#include <sys/ipc.h>
28
29/* Get system dependent definition of `struct shmid_ds' and more.  */
30#include <bits/shm.h>
31
32/* Define types required by the standard.  */
33#include <bits/types/time_t.h>
34
35#ifdef __USE_XOPEN
36# ifndef __pid_t_defined
37typedef __pid_t pid_t;
38#  define __pid_t_defined
39# endif
40#endif	/* X/Open */
41
42
43__BEGIN_DECLS
44
45/* The following System V style IPC functions implement a shared memory
46   facility.  The definition is found in XPG4.2.  */
47
48/* Shared memory control operation.  */
49#ifndef __USE_TIME64_REDIRECTS
50extern int shmctl (int __shmid, int __cmd, struct shmid_ds *__buf) __THROW;
51#else
52# ifdef __REDIRECT_NTH
53extern int __REDIRECT_NTH (shmctl,
54                           (int __shmid, int __cmd, struct shmid_ds *__buf),
55                           __shmctl64);
56# else
57#  define shmctl __shmctl64
58# endif
59#endif
60
61/* Get shared memory segment.  */
62extern int shmget (key_t __key, size_t __size, int __shmflg) __THROW;
63
64/* Attach shared memory segment.  */
65extern void *shmat (int __shmid, const void *__shmaddr, int __shmflg)
66     __THROW;
67
68/* Detach shared memory segment.  */
69extern int shmdt (const void *__shmaddr) __THROW;
70
71__END_DECLS
72
73#endif /* sys/shm.h */