FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h
1 /* $FreeBSD: src/sys/sys/sem.h,v 1.27.4.1 2005/05/05 18:25:14 rwatson Exp $ */
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 unsigned 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 unsigned short sem_num; /* semaphore # */
35 short sem_op; /* semaphore operation */
36 short sem_flg; /* operation flags */
37 };
38 #define SEM_UNDO 010000
39
40 /*
41 * semctl's arg parameter structure
42 */
43 union semun {
44 int val; /* value for SETVAL */
45 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
46 unsigned short *array; /* array for GETALL & SETALL */
47 };
48
49 /*
50 * commands for semctl
51 */
52 #define GETNCNT 3 /* Return the value of semncnt {READ} */
53 #define GETPID 4 /* Return the value of sempid {READ} */
54 #define GETVAL 5 /* Return the value of semval {READ} */
55 #define GETALL 6 /* Return semvals into arg.array {READ} */
56 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
57 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
58 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
59 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
60 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
61
62 /*
63 * Permissions
64 */
65 #define SEM_A IPC_W /* alter permission */
66 #define SEM_R IPC_R /* 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 /*
88 * Kernel wrapper for the user-level structure
89 */
90 struct semid_kernel {
91 struct semid_ds u;
92 };
93
94 /* internal "mode" bits */
95 #define SEM_ALLOC 01000 /* semaphore is allocated */
96 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
97
98 /*
99 * Process sem_undo vectors at proc exit.
100 */
101 void semexit(struct proc *p);
102 #endif /* _KERNEL */
103
104 #ifndef _KERNEL
105 #include <sys/cdefs.h>
106 #include <sys/_types.h>
107
108 #ifndef _SIZE_T_DECLARED
109 typedef __size_t size_t;
110 #define _SIZE_T_DECLARED
111 #endif
112
113 #ifndef _PID_T_DECLARED
114 typedef __pid_t pid_t;
115 #define _PID_T_DECLARED
116 #endif
117
118 __BEGIN_DECLS
119 int semsys(int, ...);
120 int semctl(int, int, int, ...);
121 int semget(key_t, int, int);
122 int semop(int, struct sembuf *, size_t);
123 __END_DECLS
124 #endif /* !_KERNEL */
125
126 #endif /* !_SYS_SEM_H_ */
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