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sem.h
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/* Copyright (C) 2002-2012 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 */ __syscall_ulong_t __unused1; __time_t sem_ctime; /* last time changed by semctl() */ __syscall_ulong_t __unused2; __syscall_ulong_t sem_nsems; /* number of semaphores in set */ __syscall_ulong_t __unused3; __syscall_ulong_t __unused4; }; /* 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 #ifdef __USE_MISC /* ipcs ctl cmds */ # define SEM_STAT 18 # define SEM_INFO 19 # define SEM_STAT_ANY 20 struct seminfo { int semmap; int semmni; int semmns; int semmnu; int semmsl; int semopm; int semume; int semusz; int semvmx; int semaem; }; #endif /* __USE_MISC */