1 /* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc. 2 3 The GNU C Library is free software; you can redistribute it and/or 4 modify it under the terms of the GNU Lesser General Public 5 License as published by the Free Software Foundation; either 6 version 2.1 of the License, or (at your option) any later version. 7 8 The GNU C Library is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 Lesser General Public License for more details. 12 13 You should have received a copy of the GNU Lesser General Public 14 License along with the GNU C Library; if not, see 15 <http://www.gnu.org/licenses/>. */ 16 17 #ifndef _SYS_SEM_H 18 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." 19 #endif 20 21 #include <sys/types.h> 22 23 /* Flags for `semop'. */ 24 #define SEM_UNDO 0x1000 /* undo the operation on exit */ 25 26 /* Commands for `semctl'. */ 27 #define GETPID 11 /* get sempid */ 28 #define GETVAL 12 /* get semval */ 29 #define GETALL 13 /* get all semval's */ 30 #define GETNCNT 14 /* get semncnt */ 31 #define GETZCNT 15 /* get semzcnt */ 32 #define SETVAL 16 /* set semval */ 33 #define SETALL 17 /* set all semval's */ 34 35 36 /* Data structure describing a set of semaphores. */ 37 struct semid_ds 38 { 39 struct ipc_perm sem_perm; /* operation permission struct */ 40 __time_t sem_otime; /* last semop() time */ 41 __time_t sem_ctime; /* last time changed by semctl() */ 42 unsigned long int sem_nsems; /* number of semaphores in set */ 43 unsigned long int __uclibc_unused1; 44 unsigned long int __uclibc_unused2; 45 }; 46 47 /* The user should define a union like the following to use it for arguments 48 for `semctl'. 49 50 union semun 51 { 52 int val; <= value for SETVAL 53 struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET 54 unsigned short int *array; <= array for GETALL & SETALL 55 struct seminfo *__buf; <= buffer for IPC_INFO 56 }; 57 58 Previous versions of this file used to define this union but this is 59 incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether 60 one must define the union or not. */ 61 #define _SEM_SEMUN_UNDEFINED 1 62 63 #ifdef __USE_MISC 64 65 /* ipcs ctl cmds */ 66 # define SEM_STAT 18 67 # define SEM_INFO 19 68 69 struct seminfo 70 { 71 int semmap; 72 int semmni; 73 int semmns; 74 int semmnu; 75 int semmsl; 76 int semopm; 77 int semume; 78 int semusz; 79 int semvmx; 80 int semaem; 81 }; 82 83 #endif /* __USE_MISC */ 84