1 /* Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001 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 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." 21 #endif 22 23 #include <sys/types.h> 24 25 /* Flags for `semop'. */ 26 #define SEM_UNDO 0x1000 /* undo the operation on exit */ 27 28 /* Commands for `semctl'. */ 29 #define GETPID 11 /* get sempid */ 30 #define GETVAL 12 /* get semval */ 31 #define GETALL 13 /* get all semval's */ 32 #define GETNCNT 14 /* get semncnt */ 33 #define GETZCNT 15 /* get semzcnt */ 34 #define SETVAL 16 /* set semval */ 35 #define SETALL 17 /* set all semval's */ 36 37 38 /* Data structure describing a set of semaphores. */ 39 struct semid_ds 40 { 41 struct ipc_perm sem_perm; /* operation permission struct */ 42 __time_t sem_otime; /* last semop() time */ 43 __time_t sem_ctime; /* last time changed by semctl() */ 44 unsigned long int sem_nsems; /* number of semaphores in set */ 45 unsigned long int __unused1; 46 unsigned long int __unused2; 47 }; 48 49 /* The user should define a union like the following to use it for arguments 50 for `semctl'. 51 52 union semun 53 { 54 int val; <= value for SETVAL 55 struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET 56 unsigned short int *array; <= array for GETALL & SETALL 57 struct seminfo *__buf; <= buffer for IPC_INFO 58 }; 59 60 Previous versions of this file used to define this union but this is 61 incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether 62 one must define the union or not. */ 63 #define _SEM_SEMUN_UNDEFINED 1 64 65 #ifdef __USE_MISC 66 67 /* ipcs ctl cmds */ 68 # define SEM_STAT 18 69 # define SEM_INFO 19 70 71 struct seminfo 72 { 73 int semmap; 74 int semmni; 75 int semmns; 76 int semmnu; 77 int semmsl; 78 int semopm; 79 int semume; 80 int semusz; 81 int semvmx; 82 int semaem; 83 }; 84 85 #endif /* __USE_MISC */ 86