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

     /* $FreeBSD: src/sys/sys/sem.h,v 1.20.2.2 2000/08/04 22:31:10 peter Exp $ */
     /* $DragonFly: src/sys/sys/sem.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */
     /*      $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_
    
    #include <sys/ipc.h>
    
    struct sem;
    
    struct semid_ds {
            struct  ipc_perm sem_perm;      /* operation permission struct */
            struct  sem *sem_base;  /* pointer to first semaphore in set */
            u_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 GMT, Jan. 1, 1970 */
            long    sem_pad2;       /* SVABI/386 says I need this here */
            long    sem_pad3[4];    /* SVABI/386 says I need this here */
    };
    
    #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
    
    #include <sys/lock.h>
    
    struct semid_pool {
            struct lock lk;
            struct semid_ds ds;
            long gen;
    };
    
    #endif
    
    /*
     * semop's sops parameter structure
     */
    struct sembuf {
            u_short sem_num;        /* semaphore # */
            short   sem_op;         /* semaphore operation */
            short   sem_flg;        /* operation flags */
    };
    #define SEM_UNDO        010000
    
    #define MAX_SOPS        5       /* maximum # of sembuf's per semop call */
    
    /*
     * semctl's arg parameter structure
     */
    union semun {
            int     val;            /* value for SETVAL */
            struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
            u_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 */
    
    /*
     * Permissions
     */
    #define SEM_A           0200    /* alter permission */
    #define SEM_R           0400    /* read permission */
    
    #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
    
    /*
     * semaphore info struct
     */
    struct seminfo {
            int     semmap,         /* # of entries in semaphore map */
                    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 */
    };
    
   /* internal "mode" bits */
   #define SEM_ALLOC       01000   /* semaphore is allocated */
   #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
   
   #endif /* _KERNEL || _KERNEL_STRUCTURES */
   
   #ifdef _KERNEL
   
   /*
    * Process sem_undo vectors at proc exit.
    */
   void    semexit (struct proc *p);
   extern struct seminfo   seminfo;
   
   #endif
   
   #ifndef _KERNEL
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int semsys (int, ...);
   int semctl (int, int, int, ...);
   int semget (key_t, int, int);
   int semop (int, struct sembuf *,unsigned);
   __END_DECLS
   #endif /* !_KERNEL */
   
   #endif /* !_SEM_H_ */

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