63 lines
1.8 KiB
Groff
63 lines
1.8 KiB
Groff
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.\" $Id$
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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 \- Get file descriptors to select on for name service
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.SH SYNOPSIS
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.nf
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.B #include <ares.h>
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.PP
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.B int ares_fds(ares_channel \fIchannel\fP, fd_set *\fIread_fds\fP,
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.B fd_set *\fIwrite_fds\fP)
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.fi
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.SH DESCRIPTION
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The
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.B ares_fds
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function retrieves the set of file descriptors which the calling
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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
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.IR channel .
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File descriptors will be set in the file descriptor sets pointed to by
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.I read_fds
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and
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.I write_fds
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as appropriate. File descriptors already set in
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.I read_fds
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and
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.I write_fds
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will remain set; initialization of the file descriptor sets
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(using
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.BR FD_ZERO )
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is the responsibility of the caller.
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.SH RETURN VALUES
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.B ares_fds
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returns one greater than the number of the highest socket set in either
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.I read_fds
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or
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.IR write_fds .
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If no queries are active,
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.B ares_fds
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will return 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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