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- /* Copyright (C) 1995-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #ifndef _SYS_SEM_H
- # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
- #endif
- #include <sys/types.h>
- /* Flags for `semop'. */
- #define SEM_UNDO 0x1000 /* undo the operation on exit */
- /* Commands for `semctl'. */
- #define GETPID 11 /* get sempid */
- #define GETVAL 12 /* get semval */
- #define GETALL 13 /* get all semval's */
- #define GETNCNT 14 /* get semncnt */
- #define GETZCNT 15 /* get semzcnt */
- #define SETVAL 16 /* set semval */
- #define SETALL 17 /* set all semval's */
- /* Data structure describing a set of semaphores. */
- struct semid_ds
- {
- struct ipc_perm sem_perm; /* operation permission struct */
- __time_t sem_otime; /* last semop() time */
- __time_t sem_ctime; /* last time changed by semctl() */
- unsigned short int sem_nsems; /* number of semaphores in set */
- };
- /* The user should define a union like the following to use it for arguments
- for `semctl'.
- union semun
- {
- int val; <= value for SETVAL
- struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
- unsigned short int *array; <= array for GETALL & SETALL
- struct seminfo *__buf; <= buffer for IPC_INFO
- };
- Previous versions of this file used to define this union but this is
- incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
- one must define the union or not. */
- #define _SEM_SEMUN_UNDEFINED 1
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