.\"

.\" Copyright 1998 by the Massachusetts Institute of Technology.

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.TH ARES_FDS 3 "23 July 1998"

.SH NAME

ares_fds \- return file descriptors to select on

.SH SYNOPSIS

.nf

#include <ares.h>

int ares_fds(ares_channel \fIchannel\fP,

             fd_set *\fIread_fds\fP,

	     fd_set *\fIwrite_fds\fP)

.fi

.SH DESCRIPTION

The \fBares_fds(3)\fP function retrieves the set of file descriptors which the

calling application should select on for reading and writing for the

processing of name service queries pending on the name service channel

identified by \fIchannel\fP.

File descriptors will be set in the file descriptor sets pointed to by

\fIread_fds\fP and \fIwrite_fds\fP as appropriate.  File descriptors already

set in \fIread_fds\fP and \fIwrite_fds\fP will remain set; initialization of

the file descriptor sets (using \fBFD_ZERO\fP) is the responsibility of the

caller.

.SH RETURN VALUES

\fBares_fds(3)\fP returns a value that is one greater than the number of the

highest socket set in either \fIread_fds\fP or \fIwrite_fds\fP.  If no queries

are active, \fBares_fds(3)\fP returns 0.

.SH SEE ALSO

.BR ares_timeout (3),

.BR ares_process (3)

.SH AUTHOR

Greg Hudson, MIT Information Systems

.br

Copyright 1998 by the Massachusetts Institute of Technology.