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

1.1     ! root        1: /*
        !             2:  * (User) Shared Memory Control Functions
        !             3:  *
        !             4:  *     Note: shmget() must be first function called.
        !             5:  *
        !             6:  * $Log:$
        !             7:  * 87/04/26    Allan Cornish
        !             8:  * Support for 32 bit 'key' added to shmget.
        !             9:  */
        !            10: 
        !            11: #include <sys/shm.h>
        !            12: 
        !            13: int  shmfd   = -1;
        !            14: static char shmdev[] = "/dev/shm";
        !            15: 
        !            16: /*
        !            17:  * Shared Memory Control Operations.
        !            18:  */
        !            19: 
        !            20: shmctl( shmid, cmd, buf )
        !            21: 
        !            22: int shmid;
        !            23: int cmd;
        !            24: int buf;
        !            25: 
        !            26: {
        !            27:        int parm[4];
        !            28: 
        !            29:        if ( shmfd < 0 )
        !            30:                return -1;
        !            31: 
        !            32:        parm[0] = -1;
        !            33:        parm[1] = shmid;
        !            34:        parm[2] = cmd;
        !            35:        parm[3] = buf;
        !            36: 
        !            37:        ioctl( shmfd, SHMCTL, parm );
        !            38:        return parm[0];
        !            39: }
        !            40: 
        !            41: /*
        !            42:  * Get Shared Memory Segment.
        !            43:  */
        !            44: 
        !            45: shmget( key, size, shmflg )
        !            46: 
        !            47: key_t key;
        !            48: int size;
        !            49: int shmflg;
        !            50: 
        !            51: {
        !            52:        int parm[5];
        !            53: 
        !            54:        if ( shmfd < 0 ) {
        !            55: 
        !            56:                if ( (shmfd = open(shmdev, 2)) < 0 ) {
        !            57: 
        !            58:                        perror( shmdev );
        !            59:                        return -1;
        !            60:                }
        !            61:        }
        !            62: 
        !            63:        parm[0] = -1;
        !            64:        parm[1] = key;
        !            65:        parm[2] = key >> 16;
        !            66:        parm[3] = size;
        !            67:        parm[4] = shmflg;
        !            68: 
        !            69:        ioctl( shmfd, SHMGET, parm );
        !            70:        return parm[0];
        !            71: }

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