1/* $FreeBSD: stable/11/sys/sys/sem.h 347995 2019-05-20 16:31:45Z kib $ */
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#ifdef _WANT_SYSVSEM_INTERNALS
14#define	_WANT_SYSVIPC_INTERNALS
15#endif
16#include <sys/ipc.h>
17
18#ifndef _PID_T_DECLARED
19typedef	__pid_t		pid_t;
20#define	_PID_T_DECLARED
21#endif
22
23#ifndef _SIZE_T_DECLARED
24typedef	__size_t	size_t;
25#define	_SIZE_T_DECLARED
26#endif
27
28#ifndef _TIME_T_DECLARED
29typedef	__time_t	time_t;
30#define	_TIME_T_DECLARED
31#endif
32
33#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
34    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
35struct semid_ds_old {
36	struct ipc_perm_old sem_perm;	/* operation permission struct */
37	struct sem	*sem_base;	/* pointer to first semaphore in set */
38	unsigned short	sem_nsems;	/* number of sems in set */
39	time_t		sem_otime;	/* last operation time */
40	long		sem_pad1;	/* SVABI/386 says I need this here */
41	time_t		sem_ctime;	/* last change time */
42    					/* Times measured in secs since */
43    					/* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
44	long		sem_pad2;	/* SVABI/386 says I need this here */
45	long		sem_pad3[4];	/* SVABI/386 says I need this here */
46};
47#endif
48
49struct semid_ds {
50	struct ipc_perm	sem_perm;	/* operation permission struct */
51	struct sem	*sem_base;	/* pointer to first semaphore in set */
52	unsigned short	sem_nsems;	/* number of sems in set */
53	time_t		sem_otime;	/* last operation time */
54	time_t		sem_ctime;	/* last change time */
55    					/* Times measured in secs since */
56    					/* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
57};
58
59/*
60 * semop's sops parameter structure
61 */
62struct sembuf {
63	unsigned short	sem_num;	/* semaphore # */
64	short		sem_op;		/* semaphore operation */
65	short		sem_flg;	/* operation flags */
66};
67#define SEM_UNDO	010000
68
69#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
70    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
71    defined(_WANT_SEMUN_OLD)
72union semun_old {
73	int		val;		/* value for SETVAL */
74	struct		semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
75	unsigned short	*array;		/* array for GETALL & SETALL */
76};
77#endif
78
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
88/*
89 * commands for semctl
90 */
91#define GETNCNT	3	/* Return the value of semncnt {READ} */
92#define GETPID	4	/* Return the value of sempid {READ} */
93#define GETVAL	5	/* Return the value of semval {READ} */
94#define GETALL	6	/* Return semvals into arg.array {READ} */
95#define GETZCNT	7	/* Return the value of semzcnt {READ} */
96#define SETVAL	8	/* Set the value of semval to arg.val {ALTER} */
97#define SETALL	9	/* Set semvals from arg.array {ALTER} */
98#define SEM_STAT 10	/* Like IPC_STAT but treats semid as sema-index */
99#define SEM_INFO 11	/* Like IPC_INFO but treats semid as sema-index */
100
101/*
102 * Permissions
103 */
104#define SEM_A		IPC_W	/* alter permission */
105#define SEM_R		IPC_R	/* read permission */
106
107#if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS)
108/*
109 * semaphore info struct
110 */
111struct seminfo {
112	int	semmni,		/* # of semaphore identifiers */
113		semmns,		/* # of semaphores in system */
114		semmnu,		/* # of undo structures in system */
115		semmsl,		/* max # of semaphores per id */
116		semopm,		/* max # of operations per semop call */
117		semume,		/* max # of undo entries per process */
118		semusz,		/* size in bytes of undo structure */
119		semvmx,		/* semaphore maximum value */
120		semaem;		/* adjust on exit max value */
121};
122
123/*
124 * Kernel wrapper for the user-level structure
125 */
126struct semid_kernel {
127	struct	semid_ds u;
128	struct	label *label;	/* MAC framework label */
129	struct	ucred *cred;	/* creator's credentials */
130};
131
132/* internal "mode" bits */
133#define	SEM_ALLOC	01000	/* semaphore is allocated */
134#define	SEM_DEST	02000	/* semaphore will be destroyed on last detach */
135#endif
136
137#ifdef _KERNEL
138extern struct seminfo	seminfo;
139/*
140 * Process sem_undo vectors at proc exit.
141 */
142void	semexit(struct proc *p);
143
144#else /* !_KERNEL */
145
146__BEGIN_DECLS
147#if __BSD_VISIBLE
148int semsys(int, ...);
149#endif
150int semctl(int, int, int, ...);
151int semget(key_t, int, int);
152int semop(int, struct sembuf *, size_t);
153__END_DECLS
154
155#endif /* !_KERNEL */
156
157#endif /* !_SYS_SEM_H_ */
158