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Annotation of coherent/b/lib/libc/sys/i8086/semop.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * User Semaphore Functions.
        !             3:  *
        !             4:  *     Note: Semget() must be first function called.
        !             5:  *
        !             6:  * $Log:$
        !             7:  * 87/04/26    Allan Cornish
        !             8:  * Support for 32 bit 'key' added to semget.
        !             9:  */
        !            10:  
        !            11: #include <sys/sem.h>
        !            12: 
        !            13: static int  semfno   = -1;
        !            14: static char semdev[] = "/dev/sem";
        !            15: 
        !            16: /*
        !            17:  * Semaphore Control Operations.
        !            18:  */
        !            19: 
        !            20: semctl( semid, semnum, cmd, arg )
        !            21: 
        !            22: int semid;
        !            23: int semnum;
        !            24: int cmd;
        !            25: int arg;
        !            26: 
        !            27: {
        !            28:        int parm[5];
        !            29: 
        !            30:        if ( semfno < 0 )
        !            31:                return -1;
        !            32: 
        !            33:        parm[0] = -1;
        !            34:        parm[1] = semid;
        !            35:        parm[2] = semnum;
        !            36:        parm[3] = cmd;
        !            37:        parm[4] = arg;
        !            38: 
        !            39:        ioctl( semfno, SEMCTL, parm );
        !            40:        return parm[0];
        !            41: }
        !            42: 
        !            43: /*
        !            44:  * Get Set of Semaphores.
        !            45:  */
        !            46: 
        !            47: semget( key, nsems, semflg )
        !            48: 
        !            49: key_t key;
        !            50: int nsems;
        !            51: int semflg;
        !            52: 
        !            53: {
        !            54:        int parm[5];
        !            55: 
        !            56:        if ( semfno < 0 ) {
        !            57: 
        !            58:                if ( (semfno = open(semdev, 0)) < 0 ) {
        !            59: 
        !            60:                        perror( semdev );
        !            61:                        return -1;
        !            62:                }
        !            63:        }
        !            64: 
        !            65:        parm[0] = -1;
        !            66:        parm[1] = key;
        !            67:        parm[2] = key >> 16;
        !            68:        parm[3] = nsems;
        !            69:        parm[4] = semflg;
        !            70: 
        !            71:        ioctl( semfno, SEMGET, parm );
        !            72:        return parm[0];
        !            73: }
        !            74: 
        !            75: /*
        !            76:  * Semaphore Operations.
        !            77:  */
        !            78:  
        !            79: semop( semid, sops, nsops )
        !            80: 
        !            81: int semid;
        !            82: struct sembuf (*sops)[];
        !            83: int nsops;
        !            84: 
        !            85: {
        !            86:        int parm[4];
        !            87: 
        !            88:        if ( semfno < 0 )
        !            89:                return -1;
        !            90: 
        !            91:        parm[0] = -1;
        !            92:        parm[1] = semid;
        !            93:        parm[2] = sops;
        !            94:        parm[3] = nsops;
        !            95: 
        !            96:        ioctl( semfno, SEMOP, parm );
        !            97:        return parm[0];
        !            98: }

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