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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_SEND 3 "25 July 1998"
-.SH NAME
-ares_send \- Initiate a DNS query
-.SH SYNOPSIS
-.nf
-.B #include <ares.h>
-.PP
-.B typedef void (*ares_callback)(void *\fIarg\fP, int \fIstatus\fP,
-.B	int \fItimeouts\fP, unsigned char *\fIabuf\fP, int \fIalen\fP)
-.PP
-.B void ares_send(ares_channel \fIchannel\fP, const unsigned char *\fIqbuf\fP,
-.B 	int \fIqlen\fP, ares_callback \fIcallback\fP, void *\fIarg\fP)
-.fi
-.SH DESCRIPTION
-The
-.B ares_send
-function initiates a DNS query on the name service channel identified
-by
-.IR channel .
-The parameters
-.I qbuf
-and
-.I qlen
-give the DNS query, which should already have been formatted according
-to the DNS protocol.  When the query is complete or has failed, the
-ares library will invoke
-.IR callback .
-Completion or failure of the query may happen immediately, or may
-happen during a later call to
-.BR ares_process (3)
-or
-.BR ares_destroy (3).
-.PP
-The callback argument
-.I arg
-is copied from the
-.B ares_send
-argument
-.IR arg .
-The callback argument
-.I status
-indicates whether the query succeeded and, if not, how it failed.  It
-may have any of the following values:
-.TP 19
-.B ARES_SUCCESS
-The query completed.
-.TP 19
-.B ARES_EBADQUERY
-The query buffer was poorly formed (was not long enough for a DNS
-header or was too long for TCP transmission).
-.TP 19
-.B ARES_ETIMEOUT
-No name servers responded within the timeout period.
-.TP 19
-.B ARES_ECONNREFUSED
-No name servers could be contacted.
-.TP 19
-.B ARES_ENOMEM
-Memory was exhausted.
-.TP 19
-.B ARES_EDESTRUCTION
-The name service channel
-.I channel
-is being destroyed; the query will not be completed.
-.PP
-The callback argument
-.I timeouts
-reports how many times a query timed out during the execution of the
-given request.
-.PP
-If the query completed, the callback argument
-.I abuf
-points to a result buffer of length
-.IR alen .
-If the query did not complete,
-.I abuf
-will be NULL and
-.I alen
-will be 0.
-.PP
-Unless the flag
-.B ARES_FLAG_NOCHECKRESP
-was set at channel initialization time,
-.B ares_send
-will normally ignore responses whose questions do not match the
-questions in
-.IR qbuf ,
-as well as responses with reply codes of
-.BR SERVFAIL ,
-.BR NOTIMP ,
-and
-.BR REFUSED .
-Unlike other query functions in the ares library, however,
-.B ares_send
-does not inspect the header of the reply packet to determine the error
-status, so a callback status of
-.B ARES_SUCCESS
-does not reflect as much about the response as for other query
-functions.
-.SH SEE ALSO
-.BR ares_process (3)
-.SH AUTHOR
-Greg Hudson, MIT Information Systems
-.br
-Copyright 1998 by the Massachusetts Institute of Technology.