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04277e02 | 1 | /* Copyright (C) 1995-2019 Free Software Foundation, Inc. |
6d52618b | 2 | This file is part of the GNU C Library. |
60478656 | 3 | |
6d52618b | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
60478656 | 8 | |
6d52618b UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
60478656 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
60478656 | 17 | |
5107cf1d | 18 | #ifndef _SYS_SEM_H |
f4017d20 | 19 | # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." |
5107cf1d UD |
20 | #endif |
21 | ||
60478656 RM |
22 | #include <sys/types.h> |
23 | ||
24 | /* Flags for `semop'. */ | |
25 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ | |
26 | ||
27 | /* Commands for `semctl'. */ | |
28 | #define GETPID 11 /* get sempid */ | |
29 | #define GETVAL 12 /* get semval */ | |
30 | #define GETALL 13 /* get all semval's */ | |
31 | #define GETNCNT 14 /* get semncnt */ | |
32 | #define GETZCNT 15 /* get semzcnt */ | |
33 | #define SETVAL 16 /* set semval */ | |
34 | #define SETALL 17 /* set all semval's */ | |
35 | ||
36 | ||
60478656 RM |
37 | /* Data structure describing a set of semaphores. */ |
38 | struct semid_ds | |
39 | { | |
6d52618b | 40 | struct ipc_perm sem_perm; /* operation permission struct */ |
60478656 RM |
41 | __time_t sem_otime; /* last semop() time */ |
42 | __time_t sem_ctime; /* last time changed by semctl() */ | |
43 | unsigned short int sem_nsems; /* number of semaphores in set */ | |
44 | }; | |
45 | ||
977bfd77 UD |
46 | /* The user should define a union like the following to use it for arguments |
47 | for `semctl'. | |
48 | ||
49 | union semun | |
50 | { | |
51 | int val; <= value for SETVAL | |
52 | struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET | |
53 | unsigned short int *array; <= array for GETALL & SETALL | |
54 | struct seminfo *__buf; <= buffer for IPC_INFO | |
55 | }; | |
56 | ||
57 | Previous versions of this file used to define this union but this is | |
58 | incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether | |
59 | one must define the union or not. */ | |
60 | #define _SEM_SEMUN_UNDEFINED 1 |