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Annotation of 42BSD/ingres/source/libq/IIpb_prime.c, revision 1.1.1.1

1.1       root        1: # include      <pipes.h>
                      2: # include      <symbol.h>
                      3: # include      <sccs.h>
                      4: 
                      5: SCCSID(@(#)IIpb_prime.c        7.2     2/16/81)
                      6: 
                      7: 
                      8: /*
                      9: **  IIPB_PRIME -- prime a pipe for reading or writing
                     10: **
                     11: **     This clears out any nasty stuff in the pipe block.  If
                     12: **     we are reading, it reads the first block so that we can
                     13: **     know what sort it is.
                     14: **
                     15: **     Parameters:
                     16: **             ppb -- a pointer to the pipe block.
                     17: **             type -- if PB_NOTYPE, we are setting for reading.
                     18: **                     Otherwise, we are setting to write a
                     19: **                     message of the indicated type.
                     20: **
                     21: **     Returns:
                     22: **             none
                     23: **
                     24: **     Side Effects:
                     25: **             Changes *ppb.
                     26: **
                     27: **     Trace Flags:
                     28: **             12.0
                     29: */
                     30: 
                     31: IIpb_prime(ppb, type)
                     32: register pb_t  *ppb;
                     33: int            type;
                     34: {
                     35:        if (type == PB_NOTYPE)
                     36:        {
                     37:                /* read pipe prime -- get the first block */
                     38:                IIpb_read(ppb);
                     39:        }
                     40:        else
                     41:        {
                     42:                /* write pipe prime -- set up initial pointers */
                     43:                ppb->pb_from = ppb->pb_resp = PB_FRONT;
                     44:                ppb->pb_type = type;
                     45:                ppb->pb_stat = 0;
                     46:                ppb->pb_nleft = PB_DBSIZE;
                     47:                ppb->pb_nused = 0;
                     48:                ppb->pb_st = mdPARSER;
                     49:        }
                     50: 
                     51:        /* do common initialization */
                     52:        ppb->pb_xptr = ppb->pb_data;
                     53: }

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