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_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.  */
51#ifndef __USE_TIME64_REDIRECTS
52extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
53#else
54# ifdef __REDIRECT_NTH
55extern int __REDIRECT_NTH (semctl,
56                           (int __semid, int __semnum, int __cmd, ...),
57                           __semctl64);
58# else
59#  define semctl __semctl64
60# endif
61#endif
62
63/* Get semaphore.  */
64extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
65
66/* Operate on semaphore.  */
67extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
68
69#ifdef __USE_GNU
70/* Operate on semaphore with timeout.  */
71# ifndef __USE_TIME64_REDIRECTS
72extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
73		       const struct timespec *__timeout) __THROW;
74# else
75#  ifdef __REDIRECT_NTH
76extern int __REDIRECT_NTH (semtimedop, (int __semid, struct sembuf *__sops,
77                                        size_t __nsops,
78                                        const struct timespec *__timeout),
79                           __semtimedop64);
80#  else
81#   define semtimedop __semtimedop64
82#  endif
83# endif
84#endif
85
86__END_DECLS
87
88#endif /* sys/sem.h */