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.\" $Id$.\".\" Copyright 1998 by the Massachusetts Institute of Technology..\".\" Permission to use, copy, modify, and distribute this.\" software and its documentation for any purpose and without.\" fee is hereby granted, provided that the above copyright.\" notice appear in all copies and that both that copyright.\" notice and this permission notice appear in supporting.\" documentation, and that the name of M.I.T. not be used in.\" advertising or publicity pertaining to distribution of the.\" software without specific, written prior permission..\" M.I.T. makes no representations about the suitability of.\" this software for any purpose. It is provided "as is".\" without express or implied warranty..\".TH ARES_FDS 3 "23 July 1998".SH NAMEares_fds \- Get file descriptors to select on for name service.SH SYNOPSIS.nf.B #include <ares.h>.PP.B int ares_fds(ares_channel \fIchannel\fP, fd_set *\fIread_fds\fP,.B fd_set *\fIwrite_fds\fP).fi.SH DESCRIPTIONThe.B ares_fdsfunction retrieves the set of file descriptors which the callingapplication should select on for reading and writing for theprocessing of name service queries pending on the name service channelidentified by.IR channel .File descriptors will be set in the file descriptor sets pointed to by.I read_fdsand.I write_fdsas appropriate. File descriptors already set in.I read_fdsand.I write_fdswill remain set; initialization of the file descriptor sets(using.BR FD_ZERO )is the responsibility of the caller..SH RETURN VALUES.B ares_fdsreturns one greater than the number of the highest socket set in either.I read_fdsor.IR write_fds .If no queries are active,.B ares_fdswill return 0..SH SEE ALSO.BR ares_timeout (3),.BR ares_process (3).SH AUTHORGreg Hudson, MIT Information Systems.brCopyright 1998 by the Massachusetts Institute of Technology.