FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h
1 /* $FreeBSD: releng/9.1/sys/sys/sem.h 224016 2011-07-14 14:18:14Z bz $ */
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(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
31 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
32 struct semid_ds_old {
33 struct ipc_perm_old sem_perm; /* operation permission struct */
34 struct sem *sem_base; /* pointer to first semaphore in set */
35 unsigned short sem_nsems; /* number of sems in set */
36 time_t sem_otime; /* last operation time */
37 long sem_pad1; /* SVABI/386 says I need this here */
38 time_t sem_ctime; /* last change time */
39 /* Times measured in secs since */
40 /* 00:00:00 GMT, Jan. 1, 1970 */
41 long sem_pad2; /* SVABI/386 says I need this here */
42 long sem_pad3[4]; /* SVABI/386 says I need this here */
43 };
44 #endif
45
46 struct semid_ds {
47 struct ipc_perm sem_perm; /* operation permission struct */
48 struct sem *sem_base; /* pointer to first semaphore in set */
49 unsigned short sem_nsems; /* number of sems in set */
50 time_t sem_otime; /* last operation time */
51 time_t sem_ctime; /* last change time */
52 /* Times measured in secs since */
53 /* 00:00:00 GMT, Jan. 1, 1970 */
54 };
55
56 /*
57 * semop's sops parameter structure
58 */
59 struct sembuf {
60 unsigned short sem_num; /* semaphore # */
61 short sem_op; /* semaphore operation */
62 short sem_flg; /* operation flags */
63 };
64 #define SEM_UNDO 010000
65
66 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
67 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
68 defined(_WANT_SEMUN_OLD)
69 union semun_old {
70 int val; /* value for SETVAL */
71 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
72 unsigned short *array; /* array for GETALL & SETALL */
73 };
74 #endif
75
76 /*
77 * semctl's arg parameter structure
78 */
79 union semun {
80 int val; /* value for SETVAL */
81 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
82 unsigned short *array; /* array for GETALL & SETALL */
83 };
84
85 /*
86 * commands for semctl
87 */
88 #define GETNCNT 3 /* Return the value of semncnt {READ} */
89 #define GETPID 4 /* Return the value of sempid {READ} */
90 #define GETVAL 5 /* Return the value of semval {READ} */
91 #define GETALL 6 /* Return semvals into arg.array {READ} */
92 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
93 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
94 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
95 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
96 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
97
98 /*
99 * Permissions
100 */
101 #define SEM_A IPC_W /* alter permission */
102 #define SEM_R IPC_R /* read permission */
103
104 #ifdef _KERNEL
105
106 /*
107 * semaphore info struct
108 */
109 struct seminfo {
110 int semmni, /* # of semaphore identifiers */
111 semmns, /* # of semaphores in system */
112 semmnu, /* # of undo structures in system */
113 semmsl, /* max # of semaphores per id */
114 semopm, /* max # of operations per semop call */
115 semume, /* max # of undo entries per process */
116 semusz, /* size in bytes of undo structure */
117 semvmx, /* semaphore maximum value */
118 semaem; /* adjust on exit max value */
119 };
120 extern struct seminfo seminfo;
121
122 /*
123 * Kernel wrapper for the user-level structure
124 */
125 struct semid_kernel {
126 struct semid_ds u;
127 struct label *label; /* MAC framework label */
128 struct ucred *cred; /* creator's credentials */
129 };
130
131 /* internal "mode" bits */
132 #define SEM_ALLOC 01000 /* semaphore is allocated */
133 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
134
135 /*
136 * Process sem_undo vectors at proc exit.
137 */
138 void semexit(struct proc *p);
139
140 #else /* ! _KERNEL */
141
142 __BEGIN_DECLS
143 #if __BSD_VISIBLE
144 int semsys(int, ...);
145 #endif
146 int semctl(int, int, int, ...);
147 int semget(key_t, int, int);
148 int semop(int, struct sembuf *, size_t);
149 __END_DECLS
150
151 #endif /* !_KERNEL */
152
153 #endif /* !_SYS_SEM_H_ */
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