/*      $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $      */

/*
 * SVID compatible sem.h file
 *
 * Author:  Daniel Boulet
 */

#ifndef _SYS_SEM_H_
#define _SYS_SEM_H_

#ifdef _WANT_SYSVSEM_INTERNALS
#define _WANT_SYSVIPC_INTERNALS
#endif
#include <sys/ipc.h>

#ifndef _PID_T_DECLARED
typedef __pid_t         pid_t;
#define _PID_T_DECLARED
#endif

#ifndef _SIZE_T_DECLARED
typedef __size_t        size_t;
#define _SIZE_T_DECLARED
#endif

#ifndef _TIME_T_DECLARED
typedef __time_t        time_t;
#define _TIME_T_DECLARED
#endif

#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
struct semid_ds_old {
        struct ipc_perm_old 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 UTC, Jan. 1, 1970, without leap seconds */
        long            sem_pad2;       /* SVABI/386 says I need this here */
        long            sem_pad3[4];    /* SVABI/386 says I need this here */
};
#endif

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 */
        time_t          sem_ctime;      /* last change time */
                                        /* Times measured in secs since */
                                        /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
};

/*
 * 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

#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
    defined(_WANT_SEMUN_OLD)
union semun_old {
        int             val;            /* value for SETVAL */
        struct          semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
        unsigned short  *array;         /* array for GETALL & SETALL */
};
#endif

#if defined(_KERNEL) || defined(_WANT_SEMUN)
/*
 * 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 */
};
#endif

/*
 * 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} */
#define SEM_STAT 10     /* Like IPC_STAT but treats semid as sema-index */
#define SEM_INFO 11     /* Like IPC_INFO but treats semid as sema-index */

/*
 * Permissions
 */
#define SEM_A           IPC_W   /* alter permission */
#define SEM_R           IPC_R   /* read permission */

#if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS)
/*
 * semaphore info struct
 */
struct seminfo {
        int     semmni;         /* # of semaphore identifiers */
        int     semmns;         /* # of semaphores in system */
        int     semmnu;         /* # of undo structures in system */
        int     semmsl;         /* max # of semaphores per id */
        int     semopm;         /* max # of operations per semop call */
        int     semume;         /* max # of undo entries per process */
        int     semusz;         /* size in bytes of undo structure */
        int     semvmx;         /* semaphore maximum value */
        int     semaem;         /* adjust on exit max value */
};

/*
 * Kernel wrapper for the user-level structure
 */
struct semid_kernel {
        struct  semid_ds u;
        struct  label *label;   /* MAC framework label */
        struct  ucred *cred;    /* creator's credentials */
};

/* internal "mode" bits */
#define SEM_ALLOC       01000   /* semaphore is allocated */
#define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
#endif

#ifdef _KERNEL
extern struct seminfo   seminfo;
/*
 * Process sem_undo vectors at proc exit.
 */
void    semexit(struct proc *p);

int     kern_get_sema(struct thread *td, struct semid_kernel **res,
            size_t *sz);

#else /* !_KERNEL */

__BEGIN_DECLS
int semctl(int, int, int, ...);
int semget(key_t, int, int);
int semop(int, struct sembuf *, size_t);
__END_DECLS

#endif /* !_KERNEL */

#endif /* !_SYS_SEM_H_ */