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1 | /* Copyright (C) 1995-2019 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, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #ifndef _SYS_SEM_H | |
19 | # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." | |
20 | #endif | |
21 | ||
22 | #include <sys/types.h> | |
23 | #include <bits/sem-pad.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 | #if __SEM_PAD_BEFORE_TIME | |
39 | # define __SEM_PAD_TIME(NAME, RES) \ | |
40 | __syscall_ulong_t __glibc_reserved ## RES; __time_t NAME | |
41 | #elif __SEM_PAD_AFTER_TIME | |
42 | # define __SEM_PAD_TIME(NAME, RES) \ | |
43 | __time_t NAME; __syscall_ulong_t __glibc_reserved ## RES | |
44 | #else | |
45 | # define __SEM_PAD_TIME(NAME, RES) \ | |
46 | __time_t NAME | |
47 | #endif | |
48 | ||
49 | /* Data structure describing a set of semaphores. */ | |
50 | struct semid_ds | |
51 | { | |
52 | struct ipc_perm sem_perm; /* operation permission struct */ | |
53 | __SEM_PAD_TIME (sem_otime, 1); /* last semop() time */ | |
54 | __SEM_PAD_TIME (sem_ctime, 2); /* last time changed by semctl() */ | |
55 | __syscall_ulong_t sem_nsems; /* number of semaphores in set */ | |
56 | __syscall_ulong_t __glibc_reserved3; | |
57 | __syscall_ulong_t __glibc_reserved4; | |
58 | }; | |
59 | ||
60 | /* The user should define a union like the following to use it for arguments | |
61 | for `semctl'. | |
62 | ||
63 | union semun | |
64 | { | |
65 | int val; <= value for SETVAL | |
66 | struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET | |
67 | unsigned short int *array; <= array for GETALL & SETALL | |
68 | struct seminfo *__buf; <= buffer for IPC_INFO | |
69 | }; | |
70 | ||
71 | Previous versions of this file used to define this union but this is | |
72 | incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether | |
73 | one must define the union or not. */ | |
74 | #define _SEM_SEMUN_UNDEFINED 1 | |
75 | ||
76 | #ifdef __USE_MISC | |
77 | ||
78 | /* ipcs ctl cmds */ | |
79 | # define SEM_STAT 18 | |
80 | # define SEM_INFO 19 | |
81 | # define SEM_STAT_ANY 20 | |
82 | ||
83 | struct seminfo | |
84 | { | |
85 | int semmap; | |
86 | int semmni; | |
87 | int semmns; | |
88 | int semmnu; | |
89 | int semmsl; | |
90 | int semopm; | |
91 | int semume; | |
92 | int semusz; | |
93 | int semvmx; | |
94 | int semaem; | |
95 | }; | |
96 | ||
97 | #endif /* __USE_MISC */ |