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Annotation of xinu/sys/dgcntl.c, revision 1.1

1.1     ! root        1: /* dgcntl.c - dgcntl */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  dgcntl  -  control function for datagram pseudo-devices
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: dgcntl(devptr, func, arg)
        !            12: struct devsw   *devptr;
        !            13: int    func;
        !            14: int    arg;
        !            15: {
        !            16:        struct  dgblk   *dgptr;
        !            17:        int     freebuf();
        !            18:        PStype  ps;
        !            19:        int     ret;
        !            20: 
        !            21:        disable(ps);
        !            22:        dgptr = (struct dgblk *)devptr->dvioblk;
        !            23:        ret = OK;
        !            24:        switch (func) {
        !            25: 
        !            26:                case DG_SETMODE:        /* set mode bits */
        !            27:                        dgptr->dg_mode = arg;
        !            28:                        break;
        !            29: 
        !            30:                case DG_CLEAR:          /* clear queued packets */
        !            31:                        preset(dgptr->dg_xport, freebuf);
        !            32:                        break;
        !            33: 
        !            34:                default:
        !            35:                        ret = SYSERR;
        !            36:        }
        !            37:        restore(ps);
        !            38:        return(ret);
        !            39: }

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