195 lines
5.3 KiB
C
195 lines
5.3 KiB
C
/* $OpenBSD: sem.h,v 1.25 2022/09/16 15:57:23 mbuhl Exp $ */
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/* $NetBSD: sem.h,v 1.8 1996/02/09 18:25:29 christos Exp $ */
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/*
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* SVID compatible sem.h file
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*
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* Author: Daniel Boulet
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*/
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#ifndef _SYS_SEM_H_
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#define _SYS_SEM_H_
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#ifndef _SYS_IPC_H_
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#include <sys/ipc.h>
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#endif
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#if __BSD_VISIBLE
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/* sem-specific sysctl variables corresponding to members of struct seminfo */
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#define KERN_SEMINFO_SEMMNI 1 /* int: # of semaphore identifiers */
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#define KERN_SEMINFO_SEMMNS 2 /* int: # of semaphores in system */
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#define KERN_SEMINFO_SEMMNU 3 /* int: # of undo structures in system */
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#define KERN_SEMINFO_SEMMSL 4 /* int: max semaphores per id */
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#define KERN_SEMINFO_SEMOPM 5 /* int: max operations per semop call */
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#define KERN_SEMINFO_SEMUME 6 /* int: max undo entries per process */
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#define KERN_SEMINFO_SEMUSZ 7 /* int: size in bytes of struct undo */
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#define KERN_SEMINFO_SEMVMX 8 /* int: semaphore maximum value */
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#define KERN_SEMINFO_SEMAEM 9 /* int: adjust on exit max value */
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#define KERN_SEMINFO_MAXID 10 /* number of valid semaphore sysctls */
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#define CTL_KERN_SEMINFO_NAMES { \
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{ 0, 0 }, \
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{ "semmni", CTLTYPE_INT }, \
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{ "semmns", CTLTYPE_INT }, \
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{ "semmnu", CTLTYPE_INT }, \
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{ "semmsl", CTLTYPE_INT }, \
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{ "semopm", CTLTYPE_INT }, \
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{ "semume", CTLTYPE_INT }, \
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{ "semusz", CTLTYPE_INT }, \
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{ "semvmx", CTLTYPE_INT }, \
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{ "semaem", CTLTYPE_INT }, \
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}
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#endif /* __BSD_VISIBLE */
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struct sem {
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unsigned short semval; /* semaphore value */
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pid_t sempid; /* pid of last operation */
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unsigned short semncnt; /* # awaiting semval > cval */
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unsigned short semzcnt; /* # awaiting semval = 0 */
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};
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struct semid_ds {
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struct ipc_perm sem_perm; /* operation permission struct */
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struct sem *sem_base; /* pointer to first semaphore in set */
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unsigned short sem_nsems; /* number of sems in set */
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time_t sem_otime; /* last operation time */
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long sem_pad1; /* SVABI/386 says I need this here */
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time_t sem_ctime; /* last change time */
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/* Times measured in secs since */
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/* 00:00:00 GMT, Jan. 1, 1970 */
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long sem_pad2; /* SVABI/386 says I need this here */
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long sem_pad3[4]; /* SVABI/386 says I need this here */
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};
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/*
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* semop's sops parameter structure
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*/
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struct sembuf {
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unsigned short sem_num; /* semaphore # */
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short sem_op; /* semaphore operation */
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short sem_flg; /* operation flags */
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};
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#define SEM_UNDO 010000
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/*
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* semctl's arg parameter structure
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*/
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union semun {
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int val; /* value for SETVAL */
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struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
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unsigned short *array; /* array for GETALL & SETALL */
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};
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/*
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* commands for semctl
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*/
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#define GETNCNT 3 /* Return the value of semncnt {READ} */
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#define GETPID 4 /* Return the value of sempid {READ} */
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#define GETVAL 5 /* Return the value of semval {READ} */
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#define GETALL 6 /* Return semvals into arg.array {READ} */
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#define GETZCNT 7 /* Return the value of semzcnt {READ} */
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#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
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#define SETALL 9 /* Set semvals from arg.array {ALTER} */
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/*
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* Permissions
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*/
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#define SEM_A 0200 /* alter permission */
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#define SEM_R 0400 /* read permission */
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#ifdef _KERNEL
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#include <sys/queue.h>
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/*
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* Kernel implementation stuff
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*/
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#define SEMVMX 32767 /* semaphore maximum value */
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#define SEMAEM 16384 /* adjust on exit max value */
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/*
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* Undo structure (one per process)
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*/
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struct sem_undo {
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SLIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
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struct process *un_proc; /* owner of this structure */
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short un_cnt; /* # of active entries */
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struct undo {
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short un_adjval; /* adjust on exit values */
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short un_num; /* semaphore # */
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int un_id; /* semid */
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} un_ent[1]; /* undo entries */
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};
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/*
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* semaphore info struct
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*/
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struct seminfo {
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int semmni, /* # of semaphore identifiers */
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semmns, /* # of semaphores in system */
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semmnu, /* # of undo structures in system */
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semmsl, /* max # of semaphores per id */
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semopm, /* max # of operations per semop call */
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semume, /* max # of undo entries per process */
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semusz, /* size in bytes of undo structure */
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semvmx, /* semaphore maximum value */
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semaem; /* adjust on exit max value */
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};
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struct sem_sysctl_info {
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struct seminfo seminfo;
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struct semid_ds semids[1];
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};
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extern struct seminfo seminfo;
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/*
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* Configuration parameters
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*/
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#ifndef SEMMNI
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#define SEMMNI 10 /* # of semaphore identifiers */
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#endif
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#ifndef SEMMNS
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#define SEMMNS 60 /* # of semaphores in system */
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#endif
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#ifndef SEMUME
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#define SEMUME 10 /* max # of undo entries per process */
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#endif
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#ifndef SEMMNU
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#define SEMMNU 30 /* # of undo structures in system */
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#endif
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/* shouldn't need tuning */
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#ifndef SEMMSL
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#define SEMMSL SEMMNS /* max # of semaphores per id */
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#endif
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#ifndef SEMOPM
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#define SEMOPM 100 /* max # of operations per semop call */
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#endif
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/* actual size of an undo structure */
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#define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
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extern struct semid_ds **sema; /* semaphore id list */
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struct proc;
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void seminit(void);
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void semexit(struct process *);
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int sysctl_sysvsem(int *, u_int, void *, size_t *, void *, size_t);
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#endif /* _KERNEL */
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#ifndef _KERNEL
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__BEGIN_DECLS
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int semctl(int, int, int, ...);
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int __semctl(int, int, int, union semun *);
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int semget(key_t, int, int);
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int semop(int, struct sembuf *, size_t);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_SEM_H_ */
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