strqset(9F)

NAME

     strqset - change information about a queue or  band  of  the
     queue

SYNOPSIS

     #include <sys/stream.h>

     int strqset(queue_t *q, qfields_t what, unsigned  char  pri,
     intptr_t val);

INTERFACE LEVEL

     Architecture independent level 1 (DDI/DKI).

PARAMETERS

     q     Pointer to the queue.

     what  Field of the queue structure (or the specified  prior-
           ity  band)  to  return information about. Valid values
           are one of:

            QHIWAT
                 High water mark.

           QLOWAT
                 Low water mark.

           QMAXPSZ
                 Largest packet accepted.

           QMINPSZ
                 Smallest packet accepted.

     pri   Priority band of interest.

     val   The value for the field to be changed.

DESCRIPTION

     strqset() gives drivers and modules a way to change informa-
     tion  about  a queue or a particular band of a queue without
     directly accessing STREAMS data structures.

RETURN VALUES

     On success, 0 is returned. EINVAL is returned  if  an  unde-
     fined attribute is specified.

CONTEXT

     strqset() can be called from user or interrupt context.

SEE ALSO

     strqget(9F), queue(9S)

     Writing Device Drivers

     STREAMS Programming Guide

NOTES

     When lowering existing values, set  QMINPSZ  before  setting
     QMAXPSZ;  when  raising  existing values, set QMAXPSZ before
     setting QMINPSZ.