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49 lines
1.9 KiB
49 lines
1.9 KiB
4 years ago
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.\"
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.\" Copyright 1998 by the Massachusetts Institute of Technology.
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.\"
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.\" Permission to use, copy, modify, and distribute this
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.\" software and its documentation for any purpose and without
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.\" fee is hereby granted, provided that the above copyright
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.\" notice appear in all copies and that both that copyright
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.\" notice and this permission notice appear in supporting
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.\" documentation, and that the name of M.I.T. not be used in
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.\" advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission.
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.\" M.I.T. makes no representations about the suitability of
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.\" this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.TH ARES_FDS 3 "23 July 1998"
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.SH NAME
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ares_fds \- return file descriptors to select on
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.SH SYNOPSIS
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.nf
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#include <ares.h>
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int ares_fds(ares_channel \fIchannel\fP,
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fd_set *\fIread_fds\fP,
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fd_set *\fIwrite_fds\fP)
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.fi
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.SH DESCRIPTION
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The \fBares_fds(3)\fP function retrieves the set of file descriptors which the
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calling application should select on for reading and writing for the
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processing of name service queries pending on the name service channel
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identified by \fIchannel\fP.
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File descriptors will be set in the file descriptor sets pointed to by
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\fIread_fds\fP and \fIwrite_fds\fP as appropriate. File descriptors already
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set in \fIread_fds\fP and \fIwrite_fds\fP will remain set; initialization of
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the file descriptor sets (using \fBFD_ZERO\fP) is the responsibility of the
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caller.
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.SH RETURN VALUES
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\fBares_fds(3)\fP returns a value that is one greater than the number of the
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highest socket set in either \fIread_fds\fP or \fIwrite_fds\fP. If no queries
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are active, \fBares_fds(3)\fP returns 0.
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.SH SEE ALSO
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.BR ares_timeout (3),
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.BR ares_process (3)
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.SH AUTHOR
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Greg Hudson, MIT Information Systems
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.br
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Copyright 1998 by the Massachusetts Institute of Technology.
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