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1/* Copyright (C) 1995-2019 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 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_SEM_H
19# error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
20#endif
21
22#include <sys/types.h>
23
24/* Flags for `semop'. */
25#define SEM_UNDO 0x1000 /* undo the operation on exit */
26
27/* Commands for `semctl'. */
28#define GETPID 11 /* get sempid */
29#define GETVAL 12 /* get semval */
30#define GETALL 13 /* get all semval's */
31#define GETNCNT 14 /* get semncnt */
32#define GETZCNT 15 /* get semzcnt */
33#define SETVAL 16 /* set semval */
34#define SETALL 17 /* set all semval's */
35
36
37/* Data structure describing a set of semaphores. */
38struct semid_ds
39{
40 struct ipc_perm sem_perm; /* operation permission struct */
41 __time_t sem_otime; /* last semop() time */
42 __time_t sem_ctime; /* last time changed by semctl() */
43 unsigned short int sem_nsems; /* number of semaphores in set */
44};
45
46/* The user should define a union like the following to use it for arguments
47 for `semctl'.
48
49 union semun
50 {
51 int val; <= value for SETVAL
52 struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
53 unsigned short int *array; <= array for GETALL & SETALL
54 struct seminfo *__buf; <= buffer for IPC_INFO
55 };
56
57 Previous versions of this file used to define this union but this is
58 incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
59 one must define the union or not. */
60#define _SEM_SEMUN_UNDEFINED 1
61

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