2003-10-08 05:54:04 +08:00
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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_TIMEOUT 3 "25 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 struct timeval *ares_timeout(ares_channel \fIchannel\fP,
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.B struct timeval *\fImaxtv\fP, struct timeval *\fItvbuf\fP)
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.fi
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.SH DESCRIPTION
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The
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.B ares_timeout
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2004-04-02 17:50:42 +08:00
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function determines the maximum time for which the caller should wait before
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invoking \fIares_process(3)\fP to process timeouts. The parameter
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2003-10-08 05:54:04 +08:00
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.I maxtv
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specifies a existing maximum timeout, or
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.B NULL
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if the caller does not wish to apply a maximum timeout. The parameter
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.I tvbuf
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must point to a writable buffer of type
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.BR "struct timeval" .
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It is valid for
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.I maxtv
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and
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.I tvbuf
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to have the same value.
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.PP
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If no queries have timeouts pending sooner than the given maximum
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timeout,
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.B ares_timeout
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returns the value of
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.IR maxtv;
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otherwise
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.B ares_timeout
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stores the appropriate timeout value into the buffer pointed to by
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.I tvbuf
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and returns the value of
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.IR tvbuf .
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.SH SEE ALSO
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.BR ares_fds (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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