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Annotation of xinu/sys/.ttyoin.c, revision 1.1.1.1

1.1       root        1: /* ttyoin.c - ttyoin */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <tty.h>
                      6: #include <io.h>
                      7: 
                      8: #ifdef lsi11
                      9: #      include <slu.h>
                     10: #else
                     11: #      include <necuart.h>
                     12: #endif
                     13: 
                     14: /*------------------------------------------------------------------------
                     15:  *  ttyoin  --  lower-half tty device driver for output interrupts
                     16:  *------------------------------------------------------------------------
                     17:  */
                     18: INTPROC        ttyoin(ttyp, cptr)
                     19:        struct  tty     *ttyp;
                     20:        struct  csr     *cptr;
                     21: {
                     22:        int     ct;
                     23: 
                     24: #ifdef DEBUG
                     25:        dotrace("ttyoin", &ttyp, 2);
                     26: #endif
                     27:        if (ttyp->ehead != ttyp->etail) {
                     28:                sluputch(cptr, ttyp->ebuff[ttyp->etail++]);
                     29:                if (ttyp->etail >= EBUFLEN)
                     30:                        ttyp->etail = 0;
                     31:                return;
                     32:        }
                     33:        if (ttyp->oheld) {                      /* honor flow control   */
                     34:                slutdisable(cptr, ttyp);
                     35:                return;
                     36:        }
                     37:        if ((ct=scount(ttyp->osem)) < OBUFLEN) {
                     38:                sluputch(cptr, ttyp->obuff[ttyp->otail++]);
                     39:                if (ttyp->otail >= OBUFLEN)
                     40:                        ttyp->otail = 0;
                     41:                if (ct > OBMINSP)
                     42:                        signal(ttyp->osem);
                     43:                else if ( ++(ttyp->odsend) == OBMINSP) {
                     44:                        ttyp->odsend = 0;
                     45:                        signaln(ttyp->osem, OBMINSP);
                     46:                }
                     47:        } else
                     48:                slutdisable(cptr, ttyp);
                     49: }

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