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
151#if __BSD_VISIBLE
152int semsys(int, ...);
153#endif
154int semctl(int, int, int, ...);
155int semget(key_t, int, int);
156int semop(int, struct sembuf *, size_t);
157__END_DECLS
158
159#endif /* !_KERNEL */
160
161#endif /* !_SYS_SEM_H_ */
162