1/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
2
3/*
4 * SVID compatible sem.h file
5 *
6 * Author: Daniel Boulet
7 */
8
9#ifndef _SYS_SEM_H_
10#define _SYS_SEM_H_
11
12#ifdef _WANT_SYSVSEM_INTERNALS
13#define _WANT_SYSVIPC_INTERNALS
14#endif
15#include <sys/ipc.h>
16
17#ifndef _PID_T_DECLARED
18typedef __pid_t pid_t;
19#define _PID_T_DECLARED
20#endif
21
22#ifndef _SIZE_T_DECLARED
23typedef __size_t size_t;
24#define _SIZE_T_DECLARED
25#endif
26
27#ifndef _TIME_T_DECLARED
28typedef __time_t time_t;
29#define _TIME_T_DECLARED
30#endif
31
32#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
33 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
34struct semid_ds_old {
35 struct ipc_perm_old sem_perm; /* operation permission struct */
36 struct sem *__sem_base; /* pointer to first semaphore in set */
37 unsigned short sem_nsems; /* number of sems in set */
38 time_t sem_otime; /* last operation time */
39 long sem_pad1; /* SVABI/386 says I need this here */
40 time_t sem_ctime; /* last change time */
41 /* Times measured in secs since */
42 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
43 long sem_pad2; /* SVABI/386 says I need this here */
44 long sem_pad3[4]; /* SVABI/386 says I need this here */
45};
46#endif
47
48struct semid_ds {
49 struct ipc_perm sem_perm; /* operation permission struct */
50 struct sem *__sem_base; /* pointer to first semaphore in set */
51 unsigned short sem_nsems; /* number of sems in set */
52 time_t sem_otime; /* last operation time */
53 time_t sem_ctime; /* last change time */
54 /* Times measured in secs since */
55 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
56};
57
58/*
59 * semop's sops parameter structure
60 */
61struct sembuf {
62 unsigned short sem_num; /* semaphore # */
63 short sem_op; /* semaphore operation */
64 short sem_flg; /* operation flags */
65};
66#define SEM_UNDO 010000
67
68#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
69 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
70 defined(_WANT_SEMUN_OLD)
71union semun_old {
72 int val; /* value for SETVAL */
73 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
74 unsigned short *array; /* array for GETALL & SETALL */
75};
76#endif
77
78#if defined(_KERNEL) || defined(_WANT_SEMUN)
79/*
80 * semctl's arg parameter structure
81 */
82union semun {
83 int val; /* value for SETVAL */
84 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
85 unsigned short *array; /* array for GETALL & SETALL */
86};
87#endif
88
89/*
90 * commands for semctl
91 */
92#define GETNCNT 3 /* Return the value of semncnt {READ} */
93#define GETPID 4 /* Return the value of sempid {READ} */
94#define GETVAL 5 /* Return the value of semval {READ} */
95#define GETALL 6 /* Return semvals into arg.array {READ} */
96#define GETZCNT 7 /* Return the value of semzcnt {READ} */
97#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
98#define SETALL 9 /* Set semvals from arg.array {ALTER} */
99#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
100#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
101
102/*
103 * Permissions
104 */
105#define SEM_A IPC_W /* alter permission */
106#define SEM_R IPC_R /* read permission */
107
108#if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS)
109/*
110 * semaphore info struct
111 */
112struct seminfo {
113 int semmni; /* # of semaphore identifiers */
114 int semmns; /* # of semaphores in system */
115 int semmnu; /* # of undo structures in system */
116 int semmsl; /* max # of semaphores per id */
117 int semopm; /* max # of operations per semop call */
118 int semume; /* max # of undo entries per process */
119 int semusz; /* size in bytes of undo structure */
120 int semvmx; /* semaphore maximum value */
121 int semaem; /* adjust on exit max value */
122};
123
124/*
125 * Kernel wrapper for the user-level structure
126 */
127struct semid_kernel {
128 struct semid_ds u;
129 struct label *label; /* MAC framework label */
130 struct ucred *cred; /* creator's credentials */
131};
132
133/* internal "mode" bits */
134#define SEM_ALLOC 01000 /* semaphore is allocated */
135#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
136#endif
137
138#ifdef _KERNEL
139extern struct seminfo seminfo;
140/*
141 * Process sem_undo vectors at proc exit.
142 */
143void semexit(struct proc *p);
144
145int kern_get_sema(struct thread *td, struct semid_kernel **res,
146 size_t *sz);
147
148#else /* !_KERNEL */
149
150__BEGIN_DECLS
151int semctl(int, int, int, ...);
152int semget(key_t, int, int);
153int semop(int, struct sembuf *, size_t);
154__END_DECLS
155
156#endif /* !_KERNEL */
157
158#endif /* !_SYS_SEM_H_ */