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Annotation of researchv9/sys/dev/spipe.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * stream pipe
        !             3:  */
        !             4: #include "sp.h"
        !             5: 
        !             6: #include "../h/param.h"
        !             7: #include "../h/systm.h"
        !             8: #include "../h/stream.h"
        !             9: #include "../h/conf.h"
        !            10: 
        !            11: struct queue   *spipes[256];
        !            12: 
        !            13: int    spsrv(), spopen(), spclose();
        !            14: static struct qinit sprinit = { putq, spsrv, spopen, spclose, 128, 65 };
        !            15: struct streamtab spinfo = { &sprinit, &sprinit };
        !            16: 
        !            17: spopen(q, dev)
        !            18: register struct queue *q;
        !            19: {
        !            20:        register d = minor(dev);
        !            21:        register struct queue *oq;
        !            22: 
        !            23:        if (q->ptr) {                   /* already open */
        !            24:                if (d&01)
        !            25:                        return(0);      /* reopening master */
        !            26:                else
        !            27:                        return(1);      /* reopening slave */
        !            28:        }
        !            29:        q->flag |= QDELIM;
        !            30:        if (oq = spipes[d^01]) {
        !            31:                if (d&01)
        !            32:                        return(0);      /* master with old lingering slave */
        !            33:                WR(q)->ptr = (caddr_t)oq;
        !            34:                WR(oq)->ptr = (caddr_t)q;
        !            35:        } else if ((d&01) == 0)
        !            36:                return(0);              /* slave opened first */
        !            37:        q->ptr = (caddr_t)dev;
        !            38:        spipes[d] = q;
        !            39:        return(1);
        !            40: }
        !            41: 
        !            42: spclose(q)
        !            43: register struct queue *q;
        !            44: {
        !            45:        register struct queue *oq;
        !            46:        register struct block *bp;
        !            47: 
        !            48:        if (oq = (struct queue *)WR(q)->ptr) {
        !            49:                while (bp = getq(WR(q)))
        !            50:                        (*oq->next->qinfo->putp)(oq->next, bp);
        !            51:                putctl(oq->next, M_HANGUP);
        !            52:                WR(oq)->ptr = NULL;
        !            53:        }
        !            54:        spipes[minor((int)q->ptr)] = NULL;
        !            55: }
        !            56: 
        !            57: spsrv(q)
        !            58: register struct queue *q;
        !            59: {
        !            60:        register struct block *bp;
        !            61:        register struct queue *oq;
        !            62: 
        !            63:        if (q->flag&QREADR) {
        !            64:                oq = (struct queue *)WR(q)->ptr;
        !            65:                if (oq && (q->next->flag & QFULL) == 0)
        !            66:                        qenable(WR(oq));
        !            67:                return;
        !            68:        }
        !            69:        oq = (struct queue *)q->ptr;
        !            70:        while (bp = getq(q)) {
        !            71:                if (oq == NULL) {
        !            72:                        freeb(bp);
        !            73:                        continue;
        !            74:                }
        !            75:                if (oq->next->flag & QFULL && bp->type < QPCTL) {
        !            76:                        putbq(q, bp);
        !            77:                        return;
        !            78:                }
        !            79:                (*oq->next->qinfo->putp)(oq->next, bp);
        !            80:        }
        !            81: }

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