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Annotation of coherent/d/286_KERNEL/USRSRC/coh/fifo_rewind.c, revision 1.1.1.1

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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