LCOM1920-T02G10

/*        $NetBSD: sem.h,v 1.31 2015/05/13 01:16:15 pgoyette Exp $        */

/*-

 * Copyright (c) 1999 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,

 * NASA Ames Research Center.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * SVID compatible sem.h file

 *

 * Author: Daniel Boulet

 */

#ifndef _SYS_SEM_H_

#define _SYS_SEM_H_

#include <sys/featuretest.h>

#include <sys/ipc.h>

#ifdef _KERNEL

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 */

};

#endif /* _KERNEL */

struct semid_ds {

        struct ipc_perm        sem_perm;        /* operation permission structure */

        unsigned short        sem_nsems;        /* number of semaphores in set */

        time_t                sem_otime;        /* last semop() time */

        time_t                sem_ctime;        /* last time changed by semctl() */

        /*

         * These members are private and used only in the internal

         * implementation of this interface.

         */

        struct __sem        *_sem_base;        /* pointer to first semaphore in set */

};

/*

 * 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                /* undo changes on process exit */

/*

 * 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} */

#if defined(_KERNEL) || defined(__minix)

/*

 * Kernel implementation stuff

 */

#define SEMVMX        32767                /* semaphore maximum value */

#define SEMAEM        16384                /* adjust on exit max value */

/*

 * Permissions

 */

#define SEM_A                0200        /* alter permission */

#define SEM_R                0400        /* read permission */

/*

 * Undo structure (one per process)

 */

struct sem_undo_entry {

        short        un_adjval;        /* adjust on exit values */

        short        un_num;                /* semaphore # */

        int        un_id;                /* semid */

};

struct sem_undo {

        struct        sem_undo *un_next;        /* ptr to next active undo structure */

        struct        proc *un_proc;                /* owner of this structure */

        short        un_cnt;                        /* # of active entries */

        struct        sem_undo_entry un_ent[1];/* undo entries */

};

#endif /* _KERNEL */

#if defined(_NETBSD_SOURCE)

/*

 * semaphore info struct

 */

struct seminfo {

        int32_t        semmap;                /* # of entries in semaphore map */

        int32_t        semmni;                /* # of semaphore identifiers */

        int32_t        semmns;                /* # of semaphores in system */

        int32_t        semmnu;                /* # of undo structures in system */

        int32_t        semmsl;                /* max # of semaphores per id */

        int32_t        semopm;                /* max # of operations per semop call */

        int32_t        semume;                /* max # of undo entries per process */

        int32_t        semusz;                /* size in bytes of undo structure */

        int32_t        semvmx;                /* semaphore maximum value */

        int32_t        semaem;                /* adjust on exit max value */

};

/* Warning: 64-bit structure padding is needed here */

struct semid_ds_sysctl {

        struct        ipc_perm_sysctl sem_perm;

        int16_t        sem_nsems;

        int16_t        pad2;

        int32_t        pad3;

        time_t        sem_otime;

        time_t        sem_ctime;

};

struct sem_sysctl_info {

        struct        seminfo seminfo;

        struct        semid_ds_sysctl semids[1];

};

/*

 * Internal "mode" bits.  The first of these is used by ipcs(1), and so

 * is defined outside the kernel as well.

 */

#define        SEM_ALLOC        01000        /* semaphore is allocated */

#endif /* !_POSIX_C_SOURCE && !_XOPEN_SOURCE */

#if defined(_KERNEL) || defined(__minix)

#define        SEM_DEST        02000        /* semaphore will be destroyed on last detach */

/*

 * 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 SEMMAP

#define SEMMAP        30                /* # of entries in semaphore map */

#endif

#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 sem_undo_entry)*SEMUME)

#ifndef __minix

/*

 * Structures allocated in machdep.c

 */

extern struct seminfo seminfo;

extern struct semid_ds *sema;                /* semaphore id pool */

#endif /* !__minix */

/*

 * Parameters to the semconfig system call

 */

#define        SEM_CONFIG_FREEZE        0        /* Freeze the semaphore facility. */

#define        SEM_CONFIG_THAW                1        /* Thaw the semaphore facility. */

#define SYSCTL_FILL_SEM(src, dst) do { \

        SYSCTL_FILL_PERM((src).sem_perm, (dst).sem_perm); \

        (dst).sem_nsems = (src).sem_nsems; \

        (dst).sem_otime = (src).sem_otime; \

        (dst).sem_ctime = (src).sem_ctime; \

} while (/*CONSTCOND*/ 0)

#endif /* _KERNEL */

#if defined(__minix)

/* ipcs ctl cmds */

# define SEM_STAT 18

# define SEM_INFO 19

#endif /* defined(__minix) */

#ifndef _KERNEL

#include <sys/cdefs.h>

__BEGIN_DECLS

#ifndef __LIBC12_SOURCE__

int        semctl(int, int, int, ...) __RENAME(__semctl50);

#endif

int        semget(key_t, int, int);

int        semop(int, struct sembuf *, size_t);

#if defined(_NETBSD_SOURCE)

int        semconfig(int);

#endif

__END_DECLS

#else

void        seminit(void);

int        semfini(void);

void        semexit(struct proc *, void *);

int        semctl1(struct lwp *, int, int, int, void *, register_t *);

#define get_semctl_arg(cmd, sembuf, arg) \

    ((cmd) == IPC_SET || (cmd) == IPC_STAT ? (void *)sembuf \

    : (cmd) == GETALL || (cmd) == SETVAL || (cmd) == SETALL ? (void *)arg \

    : NULL)

#endif /* !_KERNEL */

#endif /* !_SYS_SEM_H_ */