STROPTIONS(9S)STROPTIONS(9S)NAMEstroptions - options structure for M_SETOPTS message
SYNOPSIS
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI)
DESCRIPTION
The M_SETOPTS message contains a stroptions structure and is used to
control options in the stream head.
STRUCTURE MEMBERS
uint_t so_flags; /* options to set */
short so_readopt; /* read option */
ushort_t so_wroff; /* write offset */
ssize_t so_minpsz; /* minimum read packet size */
ssize_t so_maxpsz; /* maximum read packet size */
size_t so_hiwat; /* read queue high water mark */
size_t so_lowat; /* read queue low water mark */
unsigned char so_band; /* band for water marks */
ushort_t so_erropt; /* error option */
The following are the flags that can be set in the so_flags bit mask in
the stroptions structure. Note that multiple flags can be set.
SO_READOPT
Set read option.
SO_WROFF
Set write offset.
SO_MINPSZ
Set minimum packet size
SO_MAXPSZ
Set maximum packet size.
SO_HIWAT
Set high water mark.
SO_LOWAT
Set low water mark.
SO_MREADON
Set read notification ON.
SO_MREADOFF
Set read notification OFF.
SO_NDELON
Old TTY semantics for NDELAY reads and writes.
SO_NDELOFFSTREAMS
Semantics for NDELAY reads and writes.
SO_ISTTY
The stream is acting as a terminal.
SO_ISNTTY
The stream is not acting as a terminal.
SO_TOSTOP
Stop on background writes to this stream.
SO_TONSTOP
Do not stop on background writes to this stream.
SO_BAND
Water marks affect band.
SO_ERROPT
Set error option.
When SO_READOPT is set, the so_readopt field of the stroptions struc‐
ture can take one of the following values. See read(2).
RNORM
Read message normal.
RMSGD
Read message discard.
RMSGN
Read message, no discard.
When SO_BAND is set, so_band determines to which band so_hiwat and
so_lowat apply.
When SO_ERROPT is set, the so_erropt field of the stroptions structure
can take a value that is either none or one of:
RERRNORM
Persistent read errors; default.
RERRNONPERSIST
Non-persistent read errors.
OR'ed with either none or one of:
WERRNORM
Persistent write errors; default.
WERRNONPERSIST
Non-persistent write errors.
SEE ALSOread(2), streamio(7I)
STREAMS Programming Guide
Nov 14, 1996 STROPTIONS(9S)
