ares_timeout.3

这是国外的resip协议栈

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.\" Copyright 1998 by the Massachusetts Institute of Technology.
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.TH ARES_TIMEOUT 3 "25 July 1998"
.SH NAME
ares_fds \- Get file descriptors to select on for name service
.SH SYNOPSIS
.nf
.B #include <ares.h>
.PP
.B struct timeval *ares_timeout(ares_channel \fIchannel\fP,
.B	struct timeval *\fImaxtv\fP, struct timeval *\fItvbuf\fP)
.fi
.SH DESCRIPTION
The
.B ares_timeout
function determines the maximum time for which the caller should wait
before invoking 
.BR ares_process (3)
to process timeouts.  The parameter
.I maxtv
specifies a existing maximum timeout, or
.B NULL
if the caller does not wish to apply a maximum timeout.  The parameter
.I tvbuf
must point to a writable buffer of type
.BR "struct timeval" .
It is valid for
.I maxtv
and
.I tvbuf
to have the same value.
.PP
If no queries have timeouts pending sooner than the given maximum
timeout,
.B ares_timeout
returns the value of
.IR maxtv;
otherwise
.B ares_timeout
stores the appropriate timeout value into the buffer pointed to by
.I tvbuf
and returns the value of
.IR tvbuf .
.SH SEE ALSO
.BR ares_fds (3),
.BR ares_process (3)
.SH AUTHOR
Greg Hudson, MIT Information Systems
.br
Copyright 1998 by the Massachusetts Institute of Technology.