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.\" ========================================================================
.\"
.IX Title "xpamacros 3"
.TH xpamacros 3 "June 7, 2012" "version 2.1.14" "SAORD Documentation"
.SH "NAME"
\&\fBXPA Server Callback Macros\fR
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include
.Ve
.PP
.Vb 2
\& xpa_class, xpa_name, xpa_method, xpa_cmdfd, xpa_datafd,
\& xpa_sendian, xpa_cendian
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Server routines have access to information about the \s-1XPA\s0 being called via
the following macros (each of which takes the xpa handle as an argument):
.PP
.Vb 9
\& macro explanation
\& ------ -----------
\& xpa_class class of this xpa
\& xpa_name name of this xpa
\& xpa_method method string (inet or local connect info)
\& xpa_cmdfd fd of command socket
\& xpa_datafd fd of data socket
\& xpa_sendian endian-ness of server ("little" or "big")
\& xpa_cendian endian-ness of client ("little" or "big"
.Ve
.PP
The argument to these macros is the call_data pointer that is passed
to the server procedure. This pointer should be type case to \s-1XPA\s0
in the server routine:
.PP
.Vb 1
\& XPA xpa = (XPA)call_data;
.Ve
.PP
The most important of these macros is \fIxpa_datafd()\fR. A server routine
that sets \*(L"fillbuf=false\*(R" in receive_mode or send_mode can use this
macro to perform I/O directly to/from the client, rather than using
buf.
.PP
The xpa_cendian and xpa_sendian macros can be used together to determine
if the data transferred from the client is byte swapped with respect
to the server. Values for these macros are: \*(L"little\*(R", \*(L"big\*(R", or \*(L"?\*(R".
In order to do a proper conversion, you still need to know the format
of the data (i.e., byte swapping is dependent on the size of the data
element being converted).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See xpa(n) for a list of \s-1XPA\s0 help pages