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Full Discussion: Stream Read And Write Queues
Top Forums UNIX for Advanced & Expert Users Stream Read And Write Queues Post 21871 by Perderabo on Thursday 23rd of May 2002 07:07:49 PM
Old 05-23-2002
I wanted to refer to my Streams Docs before I answered this. I found the answer in UNIX SYSTEM V RELEASE 4 Programmer's Guide: Streams. On page 3-4 on my book it has the diagram you show together with some qinit stuff.

I suspect that your book may be similiar to mine. My chapter 4 is STREAMS Processing Routines. On page 4-4, the Asynchonous Protocol Stream Example starts. A few pages in I have:
Quote:
CHARPROC causes the echo to be transmitted back to the terminal by first copying the message with a STREAMS utility routine. Then CHARPROC uses another utility routine to obtain the address of its own write queue. Finally, the CHARPROC read put procedure uses another utility routine to call its write put procedure and pass it the message copy.
 

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LEARN ABOUT HPUX

xmcvtxmstringtobytestream

XmCvtXmStringToByteStream(library call) 								   XmCvtXmStringToByteStream(library call)

NAME

       XmCvtXmStringToByteStream -- A compound string function that converts a compound string to a Byte Stream format

SYNOPSIS

       #include <Xm/Xm.h>
       unsigned int XmCvtXmStringToByteStream(
       XmString string,
       unsigned char **prop_return);

DESCRIPTION

       XmCvtXmStringToByteStream  converts  a  compound  string to a string of bytes representing the compound string in Byte Stream format.  This
       routine is typically used by the source of a data transfer operation to produce a Byte Stream representation for  transferring  a  compound
       string to a destination.

       If prop_return is not NULL, this function creates a string of characters in Byte Stream format and returns it in prop_return.  The function
       also returns the number of bytes in prop_return.  If prop_return is NULL, the function does not return the Byte Stream format  string,  but
       it does calculate and return the number of bytes that would appear in the Byte Stream format string.

       string	 Specifies a compound string to be converted to Byte Stream format

       prop_return
		 Specifies  a pointer to a string in Byte Stream format that is created and returned by this function.	If prop_return is NULL, no
		 Byte Stream format string is returned.  When a Byte Stream format string is returned, the function allocates space  to  hold  it.
		 The  application  is  responsible  for managing this allocated space.	The application can recover the allocated space by calling
		 XtFree.

RETURN

       Returns the number of bytes in the Byte Stream representation (whether or not the Byte Stream representation is returned).

RELATED

       XmString(3) and XmCvtByteStreamToXmString(3).

													   XmCvtXmStringToByteStream(library call)
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