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/* $OpenBSD: sem.h,v 1.24 2016/09/01 08:33:40 tom Exp $ */
/* $NetBSD: sem.h,v 1.8 1996/02/09 18:25:29 christos Exp $ */
/*
* SVID compatible sem.h file
*
* Author: Daniel Boulet
*/
#ifndef _SYS_SEM_H_
#define _SYS_SEM_H_
#ifndef _SYS_IPC_H_
#include <sys/ipc.h>
#endif
#if __BSD_VISIBLE
/* sem-specific sysctl variables corresponding to members of struct seminfo */
#define KERN_SEMINFO_SEMMNI 1 /* int: # of semaphore identifiers */
#define KERN_SEMINFO_SEMMNS 2 /* int: # of semaphores in system */
#define KERN_SEMINFO_SEMMNU 3 /* int: # of undo structures in system */
#define KERN_SEMINFO_SEMMSL 4 /* int: max semaphores per id */
#define KERN_SEMINFO_SEMOPM 5 /* int: max operations per semop call */
#define KERN_SEMINFO_SEMUME 6 /* int: max undo entries per process */
#define KERN_SEMINFO_SEMUSZ 7 /* int: size in bytes of struct undo */
#define KERN_SEMINFO_SEMVMX 8 /* int: semaphore maximum value */
#define KERN_SEMINFO_SEMAEM 9 /* int: adjust on exit max value */
#define KERN_SEMINFO_MAXID 10 /* number of valid semaphore sysctls */
#define CTL_KERN_SEMINFO_NAMES { \
{ 0, 0 }, \
{ "semmni", CTLTYPE_INT }, \
{ "semmns", CTLTYPE_INT }, \
{ "semmnu", CTLTYPE_INT }, \
{ "semmsl", CTLTYPE_INT }, \
{ "semopm", CTLTYPE_INT }, \
{ "semume", CTLTYPE_INT }, \
{ "semusz", CTLTYPE_INT }, \
{ "semvmx", CTLTYPE_INT }, \
{ "semaem", CTLTYPE_INT }, \
}
#endif /* __BSD_VISIBLE */
struct sem {
unsigned short semval; /* semaphore value */
pid_t sempid; /* pid of last operation */
unsigned short semncnt; /* # awaiting semval > cval */
unsigned short semzcnt; /* # awaiting semval = 0 */
};
struct semid_ds {
struct ipc_perm sem_perm; /* operation permission struct */
struct sem *sem_base; /* pointer to first semaphore in set */
unsigned short sem_nsems; /* number of sems in set */
time_t sem_otime; /* last operation time */
long sem_pad1; /* SVABI/386 says I need this here */
time_t sem_ctime; /* last change time */
/* Times measured in secs since */
/* 00:00:00 GMT, Jan. 1, 1970 */
long sem_pad2; /* SVABI/386 says I need this here */
long sem_pad3[4]; /* SVABI/386 says I need this here */
};
/*
* semop's sops parameter structure
*/
struct sembuf {
unsigned short sem_num; /* semaphore # */
short sem_op; /* semaphore operation */
short sem_flg; /* operation flags */
};
#define SEM_UNDO 010000
/*
* semctl's arg parameter structure
*/
union semun {
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
unsigned short *array; /* array for GETALL & SETALL */
};
/*
* commands for semctl
*/
#define GETNCNT 3 /* Return the value of semncnt {READ} */
#define GETPID 4 /* Return the value of sempid {READ} */
#define GETVAL 5 /* Return the value of semval {READ} */
#define GETALL 6 /* Return semvals into arg.array {READ} */
#define GETZCNT 7 /* Return the value of semzcnt {READ} */
#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
#define SETALL 9 /* Set semvals from arg.array {ALTER} */
/*
* Permissions
*/
#define SEM_A 0200 /* alter permission */
#define SEM_R 0400 /* read permission */
#ifdef _KERNEL
#include <sys/queue.h>
/*
* Kernel implementation stuff
*/
#define SEMVMX 32767 /* semaphore maximum value */
#define SEMAEM 16384 /* adjust on exit max value */
/*
* Undo structure (one per process)
*/
struct sem_undo {
SLIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
struct process *un_proc; /* owner of this structure */
short un_cnt; /* # of active entries */
struct undo {
short un_adjval; /* adjust on exit values */
short un_num; /* semaphore # */
int un_id; /* semid */
} un_ent[1]; /* undo entries */
};
/*
* semaphore info struct
*/
struct seminfo {
int semmni, /* # of semaphore identifiers */
semmns, /* # of semaphores in system */
semmnu, /* # of undo structures in system */
semmsl, /* max # of semaphores per id */
semopm, /* max # of operations per semop call */
semume, /* max # of undo entries per process */
semusz, /* size in bytes of undo structure */
semvmx, /* semaphore maximum value */
semaem; /* adjust on exit max value */
};
struct sem_sysctl_info {
struct seminfo seminfo;
struct semid_ds semids[1];
};
extern struct seminfo seminfo;
/*
* Configuration parameters
*/
#ifndef SEMMNI
#define SEMMNI 10 /* # of semaphore identifiers */
#endif
#ifndef SEMMNS
#define SEMMNS 60 /* # of semaphores in system */
#endif
#ifndef SEMUME
#define SEMUME 10 /* max # of undo entries per process */
#endif
#ifndef SEMMNU
#define SEMMNU 30 /* # of undo structures in system */
#endif
/* shouldn't need tuning */
#ifndef SEMMSL
#define SEMMSL SEMMNS /* max # of semaphores per id */
#endif
#ifndef SEMOPM
#define SEMOPM 100 /* max # of operations per semop call */
#endif
/* actual size of an undo structure */
#define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
extern struct semid_ds **sema; /* semaphore id list */
struct proc;
void seminit(void);
void semexit(struct process *);
int sysctl_sysvsem(int *, u_int, void *, size_t *, void *, size_t);
int semctl1(struct proc *, int, int, int, union semun *, register_t *,
int (*)(const void *, void *, size_t),
int (*)(const void *, void *, size_t));
#endif /* _KERNEL */
#ifndef _KERNEL
__BEGIN_DECLS
int semctl(int, int, int, ...);
int __semctl(int, int, int, union semun *);
int semget(key_t, int, int);
int semop(int, struct sembuf *, size_t);
__END_DECLS
#endif /* !_KERNEL */
#endif /* !_SYS_SEM_H_ */
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