FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h

     /* $FreeBSD$ */
     /*      $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
    
    /*
     * 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} */
    #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 */
                   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 */
   };
   
   /*
    * 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);
   
   #else /* !_KERNEL */
   
   __BEGIN_DECLS
   #if __BSD_VISIBLE
   int semsys(int, ...);
   #endif
   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_ */

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