197 lines
4.9 KiB
C
Executable File
197 lines
4.9 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ifndef _SYS_SEM_H
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#define _SYS_SEM_H
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#pragma ident "@(#)sem.h 1.20 94/09/02 SMI" /* SVr4.0 11.14 */
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#include <sys/ipc.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* IPC Semaphore Facility.
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*/
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/*
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* Implementation Constants.
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*/
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/*
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* Permission Definitions.
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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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/*
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* Semaphore Operation Flags.
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*/
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#define SEM_UNDO 010000 /* set up adjust on exit entry */
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/*
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* Semctl Command Definitions.
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*/
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#define GETNCNT 3 /* get semncnt */
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#define GETPID 4 /* get sempid */
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#define GETVAL 5 /* get semval */
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#define GETALL 6 /* get all semval's */
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#define GETZCNT 7 /* get semzcnt */
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#define SETVAL 8 /* set semval */
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#define SETALL 9 /* set all semval's */
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/*
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* Structure Definitions.
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*/
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/*
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* There is one semaphore id data structure (semid_ds) for each set of
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* semaphores in the system.
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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; /* ptr to first semaphore in set */
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ushort_t sem_nsems; /* # of semaphores in set */
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time_t sem_otime; /* last semop time */
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long sem_pad1; /* reserved for time_t expansion */
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time_t sem_ctime; /* last change time */
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long sem_pad2; /* time_t expansion */
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long sem_binary; /* flag indicating semaphore type */
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long sem_pad3[3]; /* reserve area */
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};
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#if defined(_KERNEL) || defined(_KMEMUSER)
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#include <sys/t_lock.h>
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/* SVR3 structure */
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struct o_semid_ds {
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struct o_ipc_perm sem_perm; /* operation permission struct */
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struct o_sem *sem_base; /* ptr to first semaphore in set */
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ushort sem_nsems; /* # of semaphores in set */
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time_t sem_otime; /* last semop time */
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time_t sem_ctime; /* last change time */
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};
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/*
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* There is one semaphore structure (sem) for each semaphore in the system.
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*/
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struct sem {
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ushort semval; /* semaphore value */
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pid_t sempid; /* pid of last operation */
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ushort semncnt; /* # awaiting semval > cval */
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ushort semzcnt; /* # awaiting semval = 0 */
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kcondvar_t semncnt_cv;
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kcondvar_t semzcnt_cv;
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};
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/* SVR3 sem structure */
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struct o_sem {
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ushort semval; /* semaphore value */
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o_pid_t sempid; /* pid of last operation */
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ushort semncnt; /* # awaiting semval > cval */
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ushort semzcnt; /* # awaiting semval = 0 */
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};
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#else /* user level definition */
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struct sem {
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ushort_t semval; /* semaphore value */
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pid_t sempid; /* pid of last operation */
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ushort_t semncnt; /* # awaiting semval > cval */
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ushort_t semzcnt; /* # awaiting semval = 0 */
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ushort_t semncnt_cv;
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ushort_t semzcnt_cv;
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};
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#endif /* defined(_KERNEL) */
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/*
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* There is one undo structure per process in the system.
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*/
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#if defined(__EXTENSIONS__) || !defined(_XOPEN_SOURCE)
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struct sem_undo {
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struct sem_undo *un_np; /* ptr to next active undo structure */
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short un_cnt; /* # of active entries */
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struct undo {
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short un_aoe; /* adjust on exit values */
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ushort un_num; /* semaphore # */
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int un_id; /* semid */
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} un_ent[1]; /* undo entries (one minimum) */
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};
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#endif /* defined(__EXTENSIONS__) || !defined(_XOPEN_SOURCE) */
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/*
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* Semaphore information structure
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*/
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struct seminfo {
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int semmap; /* # of entries in semaphore map */
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int semmni; /* # of semaphore identifiers */
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int semmns; /* # of semaphores in system */
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int semmnu; /* # of undo structures in system */
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int semmsl; /* max # of semaphores per id */
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int semopm; /* max # of operations per semop call */
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int semume; /* max # of undo entries per process */
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int semusz; /* size in bytes of undo structure */
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int semvmx; /* semaphore maximum value */
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int semaem; /* adjust on exit max value */
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};
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/*
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* User semaphore template for semop system calls.
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*/
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struct sembuf {
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ushort_t 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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#if !defined(_KERNEL)
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#if defined(__STDC__)
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int semctl(int, int, int, ...);
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int semget(key_t, int, int);
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int semop(int, struct sembuf *, unsigned);
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#else /* __STDC __ */
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int semctl();
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int semget();
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int semop();
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#endif /* __STDC __ */
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#endif /* ! _KERNEL */
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#ifdef _KERNEL
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/*
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* Defined in space.c, allocated/initialized in sem.c
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*/
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extern struct semid_ds *sema; /* semaphore id pool */
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extern struct sem *sem; /* semaphore pool */
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extern struct map *semmap; /* semaphore allocation map */
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extern struct sem_undo **sem_undo; /* per process undo table */
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extern struct sem_undo *semunp; /* ptr to head of undo chain */
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extern struct sem_undo *semfup; /* ptr to head of free undo chain */
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extern int *semu; /* undo structure pool */
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extern struct seminfo seminfo; /* semaphore parameters */
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extern void semexit(void);
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#endif /* _KERNEL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SEM_H */
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