* Copyright (c) 1983 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
static char sccsid
[] = "@(#)ctl_transact.c 5.3 (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
, rp
)
int read_mask
, ctl_mask
, nready
, cc
;
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 proper type is obtained.
/* resend message until a response is obtained */
cc
= sendto(ctl_sockt
, (char *)&msg
, sizeof (msg
), 0,
&daemon_addr
, sizeof (daemon_addr
));
if (cc
!= sizeof (msg
)) {
p_error("Error on write to talk daemon");
nready
= select(32, &read_mask
, 0, 0, &wait
);
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)
cc
= recv(ctl_sockt
, (char *)rp
, sizeof (*rp
), 0);
p_error("Error on read from talk daemon");
nready
= select(32, &read_mask
, 0, 0, &wait
);
} while (nready
> 0 && (rp
->vers
!= TALK_VERSION
||
} while (rp
->vers
!= TALK_VERSION
|| rp
->type
!= type
);
rp
->id_num
= ntohl(rp
->id_num
);
rp
->addr
.sa_family
= ntohs(rp
->addr
.sa_family
);