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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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volume4
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bridge
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part01
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invite.c
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C/C++ Source or Header
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1988-05-31
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4KB
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159 lines
#ifndef lint
static char sccsid[] = "@(#)invite.c 1.1 86/02/05 SMI"; /* from UCB 1.7 83/07/06 */
#endif
#include "talk_ctl.h"
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
/*
* there wasn't an invitation waiting, so send a request containing
* our sockt address to the remote talk daemon so it can invite
* him
*/
int local_id, remote_id; /* the msg.id's for the invitations
on the local and remote machines.
These are used to delete the
invitations. */
void re_invite();
jmp_buf invitebuf;
invite_remote()
{
int nfd, read_mask, template, new_sockt;
struct itimerval itimer;
CTL_RESPONSE response;
itimer.it_value.tv_sec = RING_WAIT;
itimer.it_value.tv_usec = 0;
itimer.it_interval = itimer.it_value;
if (listen(sockt, 5) != 0) {
p_error("Error on attempt to listen for caller");
}
msg.addr = my_addr;
msg.id_num = -1; /* an impossible id_num */
invitation_waiting = 1;
announce_invite();
/*
* shut off the automatic messages for a while,
* so we can use the interupt timer to resend the invitation
*/
setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
message("Waiting for your party to respond");
signal(SIGALRM, re_invite);
(void) setjmp(invitebuf);
while ((new_sockt = accept(sockt, 0, 0)) < 0) {
if (errno != EINTR) {
p_error("Unable to connect with your party");
} else {
/* we just returned from a interupt, keep trying */
continue;
}
}
close(sockt);
sockt = new_sockt;
/* have the daemons delete the invitations now that we
have connected.
*/
current_state = "Waiting for your party to respond";
msg.id_num = local_id;
ctl_transact(my_machine_addr, msg, DELETE, &response);
msg.id_num = remote_id;
ctl_transact(his_machine_addr, msg, DELETE, &response);
invitation_waiting = 0;
}
/* routine called on interupt to re-invite the callee */
void re_invite()
{
message("Ringing your party again");
current_line++;
/* force a re-announce */
msg.id_num = remote_id + 1;
announce_invite();
longjmp(invitebuf, 1);
}
/* transmit the invitation and process the response */
announce_invite()
{
CTL_RESPONSE response;
current_state = "Trying to connect to your party's talk daemon";
ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
remote_id = response.id_num;
if (response.answer != SUCCESS) {
switch (response.answer) {
case NOT_HERE :
message("Your party is not logged on");
break;
case MACHINE_UNKNOWN :
message("Target machine does not recognize us");
break;
case UNKNOWN_REQUEST :
message("Target machine can not handle remote talk");
break;
case FAILED :
message("Target machine is too confused to talk to us");
break;
case PERMISSION_DENIED :
message("Your party is refusing messages");
break;
}
quit();
}
/* leave the actual invitation on my talk daemon */
ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
local_id = response.id_num;
}
send_delete()
{
/* tell the daemon to remove your invitation */
msg.type = DELETE;
/* this is just a extra clean up, so just send it
and don't wait for an answer */
msg.id_num = remote_id;
daemon_addr.sin_addr = his_machine_addr;
if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, &daemon_addr,
sizeof(daemon_addr)) != sizeof(CTL_MSG)) {
perror("send_delete remote");
}
msg.id_num = local_id;
daemon_addr.sin_addr = my_machine_addr;
if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, &daemon_addr,
sizeof(daemon_addr)) != sizeof(CTL_MSG)) {
perror("send_delete local");
}
}