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#ifndef _PID_T_DECLARED
16typedef	__pid_t		pid_t;
17#define	_PID_T_DECLARED
18#endif
19
20#ifndef _SIZE_T_DECLARED
21typedef	__size_t	size_t;
22#define	_SIZE_T_DECLARED
23#endif
24
25#ifndef _TIME_T_DECLARED
26typedef	__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)
32struct 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
46struct 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 */
59struct 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)
69union 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 */
79union 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 */
109struct 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};
120extern struct seminfo	seminfo;
121
122/*
123 * Kernel wrapper for the user-level structure
124 */
125struct 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 */
138void	semexit(struct proc *p);
139
140#else /* ! _KERNEL */
141
142__BEGIN_DECLS
143#if __BSD_VISIBLE
144int semsys(int, ...);
145#endif
146int semctl(int, int, int, ...);
147int semget(key_t, int, int);
148int semop(int, struct sembuf *, size_t);
149__END_DECLS
150
151#endif /* !_KERNEL */
152
153#endif /* !_SYS_SEM_H_ */
154