1 /* Copyright (C) 1995-1999, 2000, 2003 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 #ifndef _SYS_SEM_H 20 #define _SYS_SEM_H 1 21 22 #include <features.h> 23 24 #define __need_size_t 25 #include <stddef.h> 26 27 /* Get common definition of System V style IPC. */ 28 #include <sys/ipc.h> 29 30 /* Get system dependent definition of `struct semid_ds' and more. */ 31 #include <bits/sem.h> 32 33 #ifdef __USE_GNU 34 # define __need_timespec 35 # include <time.h> 36 #endif 37 38 /* The following System V style IPC functions implement a semaphore 39 handling. The definition is found in XPG2. */ 40 41 /* Structure used for argument to `semop' to describe operations. */ 42 struct sembuf 43 { 44 unsigned short int sem_num; /* semaphore number */ 45 short int sem_op; /* semaphore operation */ 46 short int sem_flg; /* operation flag */ 47 }; 48 49 50 __BEGIN_DECLS 51 52 /* Semaphore control operation. */ 53 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW; 54 55 /* Get semaphore. */ 56 extern int semget (key_t __key, int __nsems, int __semflg) __THROW; 57 58 /* Operate on semaphore. */ 59 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW; 60 61 #ifdef __USE_GNU 62 /* Operate on semaphore with timeout. */ 63 extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops, 64 __const struct timespec *__timeout) __THROW; 65 #endif 66 67 __END_DECLS 68 69 #endif /* sys/sem.h */ 70