.TH ph_rfd 3 "Oct 2002" "University of Illinois" "C Library Calls"
.SH NAME
ph_rfd, ph_wfd \- return file descriptors associated with a PH handle
.SH SYNOPSIS
.B #include <phclient.h>
.P
.BI "int ph_rfd(PH *" ph ");"
.br
.BI "int ph_wfd(PH *" ph ");"
.SH VERSION
This man page documents version 1.2 of \fBlibphclient\fP.
.SH DESCRIPTION
The \fBph_rfd\fP() and \fBph_wfd\fP() functions allow the application
to access the underlying file descriptors used by the PH handle \fIph\fP
to communicate with the PH server.  The application can use this
information to detect communications problems with the server using
\fBpoll\fP() or \fBselect\fP().
.SH RETURN VALUES
The \fBph_rfd\fP() function returns the file descriptor used for reading
from the server.

The \fBph_wfd\fP() function returns the file descriptor used for writing
to the server.
.SH NOTES
The file descriptors used for reading and writing may be (and usually are)
the same.

The application must not write to or read from the file descriptors
returned by the \fBph_rfd\fP() and \fBph_wfd\fP() functions.  If it does,
the PH handle may be left in an inconsistent state, and all subsequent
behavior is undefined.
.SH SEE ALSO
.BR ph_open (3)