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Annotation of coherent/b/lib/libc/sys/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:       shmop.c,v $
        !             7:  * Revision 1.1  92/06/30  10:32:03  bin
        !             8:  * Initial revision
        !             9:  * 
        !            10:  * 87/04/26    Allan Cornish
        !            11:  * Support for 32 bit 'key' added to shmget.
        !            12:  */
        !            13: 
        !            14: #include <sys/shm.h>
        !            15: 
        !            16: int  shmfd   = -1;
        !            17: static char shmdev[] = "/dev/shm";
        !            18: 
        !            19: /*
        !            20:  * Shared Memory Control Operations.
        !            21:  */
        !            22: 
        !            23: shmctl( shmid, cmd, buf )
        !            24: 
        !            25: int shmid;
        !            26: int cmd;
        !            27: int buf;
        !            28: 
        !            29: {
        !            30:        int parm[4];
        !            31: 
        !            32:        if ( shmfd < 0 )
        !            33:                return -1;
        !            34: 
        !            35:        parm[0] = -1;
        !            36:        parm[1] = shmid;
        !            37:        parm[2] = cmd;
        !            38:        parm[3] = buf;
        !            39: 
        !            40:        ioctl( shmfd, SHMCTL, parm );
        !            41:        return parm[0];
        !            42: }
        !            43: 
        !            44: /*
        !            45:  * Get Shared Memory Segment.
        !            46:  */
        !            47: 
        !            48: shmget( key, size, shmflg )
        !            49: 
        !            50: key_t key;
        !            51: int size;
        !            52: int shmflg;
        !            53: 
        !            54: {
        !            55:        int parm[5];
        !            56: 
        !            57:        if ( shmfd < 0 ) {
        !            58: 
        !            59:                if ( (shmfd = open(shmdev, 2)) < 0 ) {
        !            60: 
        !            61:                        perror( shmdev );
        !            62:                        return -1;
        !            63:                }
        !            64:        }
        !            65: 
        !            66:        parm[0] = -1;
        !            67:        parm[1] = key;
        !            68:        parm[2] = key >> 16;
        !            69:        parm[3] = size;
        !            70:        parm[4] = shmflg;
        !            71: 
        !            72:        ioctl( shmfd, SHMGET, parm );
        !            73:        return parm[0];
        !            74: }

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