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

1.1     ! root        1: /* dlcread.c - dlcread */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <slu11.h>
        !             6: #include <proc.h>
        !             7: #include <sleep.h>
        !             8: #include <dlc.h>
        !             9: 
        !            10: /*------------------------------------------------------------------------
        !            11:  *  dlcread  --  read a block (frame) to user's buffer, unstuffing chars
        !            12:  *------------------------------------------------------------------------
        !            13:  */
        !            14: dlcread(devptr, buf, maxchars)
        !            15: struct devsw   *devptr;
        !            16: char   *buf;
        !            17: int    maxchars;
        !            18: {
        !            19:        char    ps;
        !            20:        int     nread;
        !            21:        struct  dlblk   *dptr;
        !            22: 
        !            23:        disable(ps);
        !            24:        if (maxchars<=0 || (dptr=devptr->dvioblk)->distate != DLIINIT) {
        !            25:                restore(ps);
        !            26:                return(SYSERR);
        !            27:        }
        !            28:        dptr->distate = DLIREADY;
        !            29:        dptr->dinext = dptr->distart = buf;
        !            30:        dptr->dimax = maxchars;
        !            31:        dptr->dicount = 0;
        !            32:        dptr->diesc = FALSE;
        !            33:        dptr->diproc = currpid;
        !            34:        suspend(currpid);
        !            35:        nread = dptr->dicount;
        !            36:        dptr->distate = DLIINIT;
        !            37:        restore(ps);
        !            38:        return(nread);
        !            39: }

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