1 /* Copyright (C) 1995, 1996, 1997, 1998
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
21 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
24 #include <sys/types.h>
26 /* Flags for `semop'. */
27 #define SEM_UNDO 0x1000 /* undo the operation on exit */
29 /* Commands for `semctl'. */
30 #define GETPID 11 /* get sempid */
31 #define GETVAL 12 /* get semval */
32 #define GETALL 13 /* get all semval's */
33 #define GETNCNT 14 /* get semncnt */
34 #define GETZCNT 15 /* get semzcnt */
35 #define SETVAL 16 /* set semval */
36 #define SETALL 17 /* set all semval's */
39 /* Data structure describing a set of semaphores. */
42 struct ipc_perm sem_perm; /* operation permission struct */
43 __time_t sem_otime; /* last semop() time */
44 __time_t sem_ctime; /* last time changed by semctl() */
45 unsigned short int sem_nsems; /* number of semaphores in set */
48 /* The user should define a union like the following to use it for arguments
53 int val; <= value for SETVAL
54 struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
55 unsigned short int *array; <= array for GETALL & SETALL
56 struct seminfo *__buf; <= buffer for IPC_INFO
59 Previous versions of this file used to define this union but this is
60 incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
61 one must define the union or not. */
62 #define _SEM_SEMUN_UNDEFINED 1