1 /* Copyright (C) 1995 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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
17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef _SYS_SEM_BUF_H
21 #define _SYS_SEM_BUF_H
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 */
41 /* Data structure describing a set of semaphores. */
44 struct ipc_perm sem_perm; /* operation permisson struct */
45 __time_t sem_otime; /* last semop() time */
46 __time_t sem_ctime; /* last time changed by semctl() */
47 struct sem *__sembase; /* ptr to first semaphore in array */
48 struct sem_queue *__sem_pending; /* pending operations */
49 struct sem_queue *__sem_pending_last; /* last pending operation */
50 struct sem_undo *__undo; /* ondo requests on this array */
51 unsigned short int sem_nsems; /* number of semaphores in set */
54 /* Union used for argument for `semctl'. */
57 int val; /* value for SETVAL */
58 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
59 unsigned short int *array; /* array for GETALL & SETALL */
60 struct seminfo *__buf; /* buffer for IPC_INFO */
65 #endif /* sys/sem_buf.h */