1/* Copyright (C) 1995-2020 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_SEM_H
19#define _SYS_SEM_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 semid_ds' and more. */
30#include <bits/sem.h>
31
32#ifdef __USE_GNU
33# include <bits/types/struct_timespec.h>
34#endif
35
36/* The following System V style IPC functions implement a semaphore
37 handling. The definition is found in XPG2. */
38
39/* Structure used for argument to `semop' to describe operations. */
40struct sembuf
41{
42 unsigned short int sem_num; /* semaphore number */
43 short int sem_op; /* semaphore operation */
44 short int sem_flg; /* operation flag */
45};
46
47
48__BEGIN_DECLS
49
50/* Semaphore control operation. */
51extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
52
53/* Get semaphore. */
54extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
55
56/* Operate on semaphore. */
57extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
58
59#ifdef __USE_GNU
60/* Operate on semaphore with timeout. */
61extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
62 const struct timespec *__timeout) __THROW;
63#endif
64
65__END_DECLS
66
67#endif /* sys/sem.h */
68