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Annotation of coherent/d/PS2_KERNEL/coh.286/fifo_rewind.c, revision 1.1

1.1     ! root        1: /* fifo_rewind.c -- Rewind an internally typed fifo.  */
        !             2: #include <sys/typed.h>
        !             3: 
        !             4: /* Go back to the start of the fifo.
        !             5:  * Takes a FIFO.  For reading, go back to the first space; for writing
        !             6:  * truncate the FIFO to empty.
        !             7:  * Returns 1 on success, 0 otherwise.
        !             8:  */
        !             9: int
        !            10: fifo_rewind(ffp)
        !            11:        FIFO *ffp;
        !            12: {
        !            13:        /* Error checking of arguments.  */
        !            14:        if (0 == ffp->f_flags) {
        !            15:                return(0);      /* This ffp is not open.  */
        !            16:        }
        !            17: 
        !            18:        /* Either reading or writing MUST be set.  */
        !            19:        if ((F_READ != F_READ & ffp->f_flags) &&
        !            20:            (F_WRITE != F_WRITE & ffp->f_flags) ){
        !            21:                return(0);      /* Illegal flags.  */
        !            22:        }
        !            23: 
        !            24:        /* Rewind to the first space in this fifo (skip the header).  */
        !            25:        ffp->f_offset = ((typed_space *) (ffp->f_space)) + 1;
        !            26: 
        !            27:        return(1);
        !            28: } /* fifo_rewind() */

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