FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h
1 /* $FreeBSD$ */
2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
3
4 /*
5 * SVID compatible sem.h file
6 *
7 * Author: Daniel Boulet
8 */
9
10 #ifndef _SYS_SEM_H_
11 #define _SYS_SEM_H_
12
13 #include <sys/ipc.h>
14
15 struct sem;
16
17 struct semid_ds {
18 struct ipc_perm sem_perm; /* operation permission struct */
19 struct sem *sem_base; /* pointer to first semaphore in set */
20 u_short sem_nsems; /* number of sems in set */
21 time_t sem_otime; /* last operation time */
22 long sem_pad1; /* SVABI/386 says I need this here */
23 time_t sem_ctime; /* last change time */
24 /* Times measured in secs since */
25 /* 00:00:00 GMT, Jan. 1, 1970 */
26 long sem_pad2; /* SVABI/386 says I need this here */
27 long sem_pad3[4]; /* SVABI/386 says I need this here */
28 };
29
30 /*
31 * semop's sops parameter structure
32 */
33 struct sembuf {
34 u_short sem_num; /* semaphore # */
35 short sem_op; /* semaphore operation */
36 short sem_flg; /* operation flags */
37 };
38 #define SEM_UNDO 010000
39
40 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
41
42 /*
43 * semctl's arg parameter structure
44 */
45 union semun {
46 int val; /* value for SETVAL */
47 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
48 u_short *array; /* array for GETALL & SETALL */
49 };
50
51 /*
52 * commands for semctl
53 */
54 #define GETNCNT 3 /* Return the value of semncnt {READ} */
55 #define GETPID 4 /* Return the value of sempid {READ} */
56 #define GETVAL 5 /* Return the value of semval {READ} */
57 #define GETALL 6 /* Return semvals into arg.array {READ} */
58 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
59 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
60 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
61
62 /*
63 * Permissions
64 */
65 #define SEM_A 0200 /* alter permission */
66 #define SEM_R 0400 /* read permission */
67
68 #ifdef _KERNEL
69
70 /*
71 * semaphore info struct
72 */
73 struct seminfo {
74 int semmap, /* # of entries in semaphore map */
75 semmni, /* # of semaphore identifiers */
76 semmns, /* # of semaphores in system */
77 semmnu, /* # of undo structures in system */
78 semmsl, /* max # of semaphores per id */
79 semopm, /* max # of operations per semop call */
80 semume, /* max # of undo entries per process */
81 semusz, /* size in bytes of undo structure */
82 semvmx, /* semaphore maximum value */
83 semaem; /* adjust on exit max value */
84 };
85 extern struct seminfo seminfo;
86
87 /* internal "mode" bits */
88 #define SEM_ALLOC 01000 /* semaphore is allocated */
89 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
90
91 /*
92 * Process sem_undo vectors at proc exit.
93 */
94 void semexit __P((struct proc *p));
95 #endif /* _KERNEL */
96
97 #ifndef _KERNEL
98 #include <sys/cdefs.h>
99
100 __BEGIN_DECLS
101 int semsys __P((int, ...));
102 int semctl __P((int, int, int, ...));
103 int semget __P((key_t, int, int));
104 int semop __P((int, struct sembuf *,unsigned));
105 __END_DECLS
106 #endif /* !_KERNEL */
107
108 #endif /* !_SEM_H_ */
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