Data Structures for Drivers                        stroptions(9S)



NAME
     stroptions - options structure for MSETOPTS message

SYNOPSIS
     #include 
     #include 
     #include 
     #include 


INTERFACE LEVEL
     Architecture independent level 1 (DI/DKI)

DESCRIPTION
     The MSETOPTS message contains a stroptions structure and is
     used to control options in the stream head.

STRUCTURE MEMBERS
       uintt           soflags;      /* options to set */
       short            soreadopt;    /* read option */
       ushortt         sowroff;      /* write offset */
       ssizet          sominpsz;     /* minimum read packet size */
       ssizet          somaxpsz;     /* maximum read packet size */
       sizet           sohiwat;      /* read queue high water mark */
       sizet           solowat;      /* read queue low water mark */
       unsigned char    soband;       /* band for water marks */
       ushortt         soerropt;     /* error option */



     The following are the flags that can be set in the  soflags
     bit  mask  in  the stroptions structure.  Note that multiple
     flags can be set.

     SOREADOPT           Set read option.


     SOWROF             Set write offset.


     SOMINPSZ            Set minimum packet size


     SOMAXPSZ            Set maximum packet size.


     SOHIWAT             Set high water mark.


     SOLOWAT             Set low water mark.





SunOS 5.11          Last change: 14 Nov 1996                    1






Data Structures for Drivers                        stroptions(9S)



     SOMREADON           Set read notification ON.


     SOMREADOF          Set read notification OF.


     SONDELON            Old TY semantics for NDELAY reads  and
                          writes.


     SONDELOFSTREAMS    Semantics for NDELAY reads and writes.


     SOISTY             The stream is acting as a terminal.


     SOISNTY            The stream is not acting as a terminal.


     SOTOSTOP            Stop  on  background  writes  to   this
                          stream.


     SOTONSTOP           Do not stop  on  background  writes  to
                          this stream.


     SOBAND              Water marks affect band.


     SOEROPT            Set error option.



     When SOREADOPT is set, the soreadopt field of  the  strop-
     tions  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 SOBAND  is  set,  soband  determines  to  which  band
     sohiwat and solowat apply.





SunOS 5.11          Last change: 14 Nov 1996                    2






Data Structures for Drivers                        stroptions(9S)



     When SOEROPT is set, the soerropt field of the stroptions
     structure can take a value that is either none or one of:

     RERNORM          Persistent read errors; default.


     RERNONPERSIST    Non-persistent read errors.



     OR'ed with either none or one of:

     WERNORM          Persistent write errors; default.


     WERNONPERSIST    Non-persistent write errors.


SEE ALSO
     read(2), streamio(7I)


     STREAMS Programming Guide
































SunOS 5.11          Last change: 14 Nov 1996                    3