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stroptions

stroptions(9S)						    Data Structures for Drivers 					    stroptions(9S)

NAME

       stroptions - 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 structure 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 ALSO

       read(2), streamio(7I)

       STREAMS Programming Guide

SunOS 5.11							    14 Nov 1996 						    stroptions(9S)