FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h
1 /* $FreeBSD: releng/7.3/sys/sys/sem.h 196006 2009-07-31 20:32:55Z jhb $ */
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 #ifndef _PID_T_DECLARED
16 typedef __pid_t pid_t;
17 #define _PID_T_DECLARED
18 #endif
19
20 #ifndef _SIZE_T_DECLARED
21 typedef __size_t size_t;
22 #define _SIZE_T_DECLARED
23 #endif
24
25 #ifndef _TIME_T_DECLARED
26 typedef __time_t time_t;
27 #define _TIME_T_DECLARED
28 #endif
29
30 #if defined(_KERNEL)
31 struct semid_ds_old {
32 struct ipc_perm_old sem_perm; /* operation permission struct */
33 struct sem *sem_base; /* pointer to first semaphore in set */
34 unsigned short sem_nsems; /* number of sems in set */
35 time_t sem_otime; /* last operation time */
36 long sem_pad1; /* SVABI/386 says I need this here */
37 time_t sem_ctime; /* last change time */
38 /* Times measured in secs since */
39 /* 00:00:00 GMT, Jan. 1, 1970 */
40 long sem_pad2; /* SVABI/386 says I need this here */
41 long sem_pad3[4]; /* SVABI/386 says I need this here */
42 };
43 #endif
44
45 struct semid_ds {
46 struct ipc_perm sem_perm; /* operation permission struct */
47 struct sem *sem_base; /* pointer to first semaphore in set */
48 unsigned short sem_nsems; /* number of sems in set */
49 time_t sem_otime; /* last operation time */
50 time_t sem_ctime; /* last change time */
51 /* Times measured in secs since */
52 /* 00:00:00 GMT, Jan. 1, 1970 */
53 };
54
55 /*
56 * semop's sops parameter structure
57 */
58 struct sembuf {
59 unsigned short sem_num; /* semaphore # */
60 short sem_op; /* semaphore operation */
61 short sem_flg; /* operation flags */
62 };
63 #define SEM_UNDO 010000
64
65 #if defined(_KERNEL) || defined(_WANT_SEMUN_OLD)
66 union semun_old {
67 int val; /* value for SETVAL */
68 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
69 unsigned short *array; /* array for GETALL & SETALL */
70 };
71 #endif
72
73 /*
74 * semctl's arg parameter structure
75 */
76 union semun {
77 int val; /* value for SETVAL */
78 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
79 unsigned short *array; /* array for GETALL & SETALL */
80 };
81
82 /*
83 * commands for semctl
84 */
85 #define GETNCNT 3 /* Return the value of semncnt {READ} */
86 #define GETPID 4 /* Return the value of sempid {READ} */
87 #define GETVAL 5 /* Return the value of semval {READ} */
88 #define GETALL 6 /* Return semvals into arg.array {READ} */
89 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
90 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
91 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
92 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
93 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
94
95 /*
96 * Permissions
97 */
98 #define SEM_A IPC_W /* alter permission */
99 #define SEM_R IPC_R /* read permission */
100
101 #ifdef _KERNEL
102
103 /*
104 * semaphore info struct
105 */
106 struct seminfo {
107 int semmap, /* # of entries in semaphore map */
108 semmni, /* # of semaphore identifiers */
109 semmns, /* # of semaphores in system */
110 semmnu, /* # of undo structures in system */
111 semmsl, /* max # of semaphores per id */
112 semopm, /* max # of operations per semop call */
113 semume, /* max # of undo entries per process */
114 semusz, /* size in bytes of undo structure */
115 semvmx, /* semaphore maximum value */
116 semaem; /* adjust on exit max value */
117 };
118 extern struct seminfo seminfo;
119
120 /*
121 * Kernel wrapper for the user-level structure
122 */
123 struct semid_kernel {
124 struct semid_ds u;
125 struct label *label; /* MAC framework label */
126 };
127
128 /* internal "mode" bits */
129 #define SEM_ALLOC 01000 /* semaphore is allocated */
130 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
131
132 /*
133 * Process sem_undo vectors at proc exit.
134 */
135 void semexit(struct proc *p);
136
137 #else /* ! _KERNEL */
138
139 __BEGIN_DECLS
140 int semsys(int, ...);
141 int semctl(int, int, int, ...);
142 int semget(key_t, int, int);
143 int semop(int, struct sembuf *, size_t);
144 __END_DECLS
145
146 #endif /* !_KERNEL */
147
148 #endif /* !_SYS_SEM_H_ */
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