static char sccsid
[] = "@(#)ctl_transact.c 1.3 (Berkeley) %G%";
#define CTL_WAIT 2 /* time to wait for a response, in seconds */
* SOCKDGRAM is unreliable, so we must repeat messages if we have
* not recieved an acknowledgement within a reasonable amount
ctl_transact(target
, msg
, type
, response
)
daemon_addr
.sin_addr
= target
;
daemon_addr
.sin_port
= daemon_port
;
ctl_mask
= 1 << ctl_sockt
;
* keep sending the message until a response of the right
/* keep sending the message until a response is obtained */
cc
= sendto(ctl_sockt
, (char *)&msg
, sizeof(CTL_MSG
), 0,
&daemon_addr
, sizeof(daemon_addr
));
if (cc
!= sizeof(CTL_MSG
)) {
p_error("Error on write to talk daemon");
if ((nready
= select(32, &read_mask
, 0, 0, &wait
)) < 0) {
p_error("Error waiting for daemon response");
/* keep reading while there are queued messages
(this is not necessary, it just saves extra
request/acknowledgements being sent)
junk_size
= sizeof(junk
);
cc
= recvfrom(ctl_sockt
, (char *)response
,
sizeof (CTL_RESPONSE
), 0, &junk
, &junk_size
);
p_error("Error on read from talk daemon");
nready
= select(32, &read_mask
, 0, 0, &wait
);
} while (nready
> 0 && response
->type
!= type
);
} while (response
->type
!= type
);