| /* Copyright (C) 1995-2014 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 |