projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 977bfd77 UD |
1 | /* Copyright (C) 1995, 1996, 1997, 1998 |
| 2 | Free Software Foundation, Inc. | |
| 6d52618b | 3 | This file is part of the GNU C Library. |
| 60478656 | 4 | |
| 6d52618b UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public License as | |
| 7 | published by the Free Software Foundation; either version 2 of the | |
| 8 | License, or (at your option) any later version. | |
| 60478656 | 9 | |
| 6d52618b UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Library General Public License for more details. | |
| 60478656 | 14 | |
| 6d52618b UD |
15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 18 | Boston, MA 02111-1307, USA. */ | |
| 60478656 | 19 | |
| 5107cf1d | 20 | #ifndef _SYS_SEM_H |
| f4017d20 | 21 | # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." |
| 5107cf1d UD |
22 | #endif |
| 23 | ||
| 60478656 RM |
24 | #include <sys/types.h> |
| 25 | ||
| 26 | /* Flags for `semop'. */ | |
| 27 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ | |
| 28 | ||
| 29 | /* Commands for `semctl'. */ | |
| 30 | #define GETPID 11 /* get sempid */ | |
| 31 | #define GETVAL 12 /* get semval */ | |
| 32 | #define GETALL 13 /* get all semval's */ | |
| 33 | #define GETNCNT 14 /* get semncnt */ | |
| 34 | #define GETZCNT 15 /* get semzcnt */ | |
| 35 | #define SETVAL 16 /* set semval */ | |
| 36 | #define SETALL 17 /* set all semval's */ | |
| 37 | ||
| 38 | ||
| 60478656 RM |
39 | /* Data structure describing a set of semaphores. */ |
| 40 | struct semid_ds | |
| 41 | { | |
| 6d52618b | 42 | struct ipc_perm sem_perm; /* operation permission struct */ |
| 60478656 RM |
43 | __time_t sem_otime; /* last semop() time */ |
| 44 | __time_t sem_ctime; /* last time changed by semctl() */ | |
| 45 | unsigned short int sem_nsems; /* number of semaphores in set */ | |
| 46 | }; | |
| 47 | ||
| 977bfd77 UD |
48 | /* The user should define a union like the following to use it for arguments |
| 49 | for `semctl'. | |
| 50 | ||
| 51 | union semun | |
| 52 | { | |
| 53 | int val; <= value for SETVAL | |
| 54 | struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET | |
| 55 | unsigned short int *array; <= array for GETALL & SETALL | |
| 56 | struct seminfo *__buf; <= buffer for IPC_INFO | |
| 57 | }; | |
| 58 | ||
| 59 | Previous versions of this file used to define this union but this is | |
| 60 | incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether | |
| 61 | one must define the union or not. */ | |
| 62 | #define _SEM_SEMUN_UNDEFINED 1 |