1 /* Copyright (C) 1995-2022 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, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_SEM_H 19 #define _SYS_SEM_H 1 20 21 #include <features.h> 22 23 #define __need_size_t 24 #include <stddef.h> 25 26 /* Get common definition of System V style IPC. */ 27 #include <sys/ipc.h> 28 29 /* Get system dependent definition of `struct semid_ds' and more. */ 30 #include <bits/sem.h> 31 32 #ifdef __USE_GNU 33 # include <bits/types/struct_timespec.h> 34 #endif 35 36 /* The following System V style IPC functions implement a semaphore 37 handling. The definition is found in XPG2. */ 38 39 /* Structure used for argument to `semop' to describe operations. */ 40 struct sembuf 41 { 42 unsigned short int sem_num; /* semaphore number */ 43 short int sem_op; /* semaphore operation */ 44 short int sem_flg; /* operation flag */ 45 }; 46 47 48 __BEGIN_DECLS 49 50 /* Semaphore control operation. */ 51 #ifndef __USE_TIME_BITS64 52 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW; 53 #else 54 # ifdef __REDIRECT_NTH 55 extern int __REDIRECT_NTH (semctl, 56 (int __semid, int __semnum, int __cmd, ...), 57 __semctl64); 58 # else 59 # define semctl __semctl64 60 # endif 61 #endif 62 63 /* Get semaphore. */ 64 extern int semget (key_t __key, int __nsems, int __semflg) __THROW; 65 66 /* Operate on semaphore. */ 67 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW; 68 69 #ifdef __USE_GNU 70 /* Operate on semaphore with timeout. */ 71 # ifndef __USE_TIME_BITS64 72 extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops, 73 const struct timespec *__timeout) __THROW; 74 # else 75 # ifdef __REDIRECT_NTH 76 extern int __REDIRECT_NTH (semtimedop, (int __semid, struct sembuf *__sops, 77 size_t __nsops, 78 const struct timespec *__timeout), 79 __semtimedop64); 80 # else 81 # define semtimedop __semtimedop64 82 # endif 83 # endif 84 #endif 85 86 __END_DECLS 87 88 #endif /* sys/sem.h */ 89