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Annotation of 42BSD/ucb/talk/invite.c, revision 1.1

1.1     ! root        1: /* $Header: /a/guest/moore/talk/RCS/invite.c,v 1.7 83/07/06 00:17:32 moore Exp $ */
        !             2: 
        !             3: #include "talk_ctl.h"
        !             4: #include <sys/time.h>
        !             5: #include <signal.h>
        !             6: #include <setjmp.h>
        !             7:     
        !             8:     /*
        !             9:      * there wasn't an invitation waiting, so send a request containing
        !            10:      * our sockt address to the remote talk daemon so it can invite
        !            11:      * him 
        !            12:      */
        !            13: 
        !            14: int local_id, remote_id;       /* the msg.id's for the invitations
        !            15:                                   on the local and remote machines.
        !            16:                                   These are used to delete the 
        !            17:                                   invitations. */
        !            18: void re_invite();
        !            19: jmp_buf        invitebuf;
        !            20: 
        !            21: invite_remote()
        !            22: {
        !            23:     int nfd, read_mask, template, new_sockt;
        !            24:     struct itimerval itimer;
        !            25:     CTL_RESPONSE response;
        !            26: 
        !            27:     itimer.it_value.tv_sec = RING_WAIT;
        !            28:     itimer.it_value.tv_usec = 0;
        !            29:     itimer.it_interval = itimer.it_value;
        !            30: 
        !            31:     if (listen(sockt, 5) != 0) {
        !            32:        p_error("Error on attempt to listen for caller");
        !            33:     }
        !            34: 
        !            35:     msg.addr = my_addr;
        !            36:     msg.id_num = -1;           /* an impossible id_num */
        !            37: 
        !            38:     invitation_waiting = 1;
        !            39: 
        !            40:     announce_invite();
        !            41: 
        !            42:        /*
        !            43:         * shut off the automatic messages for a while,
        !            44:         * so we can use the interupt timer to resend the invitation
        !            45:         */
        !            46: 
        !            47:     end_msgs();
        !            48:     setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
        !            49:     message("Waiting for your party to respond");
        !            50:     signal(SIGALRM, re_invite);
        !            51:     (void) setjmp(invitebuf);
        !            52: 
        !            53:     while ((new_sockt = accept(sockt, 0, 0)) < 0) {
        !            54:        if (errno != EINTR) {
        !            55:            p_error("Unable to connect with your party");
        !            56:        } else {
        !            57:            /* we just returned from a interupt, keep trying */
        !            58:            continue;
        !            59:        }
        !            60:     }
        !            61: 
        !            62:     close(sockt);
        !            63:     sockt = new_sockt;
        !            64: 
        !            65:        /* have the daemons delete the invitations now that we
        !            66:           have connected.
        !            67:         */
        !            68: 
        !            69:     current_state = "Waiting for your party to respond";
        !            70:     start_msgs();
        !            71: 
        !            72:     msg.id_num = local_id;
        !            73:     ctl_transact(my_machine_addr, msg, DELETE, &response);
        !            74:     msg.id_num = remote_id;
        !            75:     ctl_transact(his_machine_addr, msg, DELETE, &response);
        !            76:     invitation_waiting = 0;
        !            77: }
        !            78: 
        !            79:     /* routine called on interupt to re-invite the callee */
        !            80: 
        !            81: void re_invite()
        !            82: {
        !            83:     message("Ringing your party again");
        !            84:     current_line++;
        !            85:        /* force a re-announce */
        !            86:     msg.id_num = remote_id + 1;
        !            87:     announce_invite();
        !            88:     longjmp(invitebuf, 1);
        !            89: }
        !            90: 
        !            91:     /* transmit the invitation and process the response */
        !            92: 
        !            93: announce_invite()
        !            94: {
        !            95:     CTL_RESPONSE response;
        !            96: 
        !            97:     current_state = "Trying to connect to your party's talk daemon";
        !            98: 
        !            99:     ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
        !           100:     remote_id = response.id_num;
        !           101: 
        !           102:     if (response.answer != SUCCESS) {
        !           103: 
        !           104:        switch (response.answer) {
        !           105:            
        !           106:            case NOT_HERE :
        !           107:                message("Your party is not logged on");
        !           108:                break;
        !           109: 
        !           110:            case MACHINE_UNKNOWN :
        !           111:                message("Target machine does not recognize us");
        !           112:                break;
        !           113: 
        !           114:            case UNKNOWN_REQUEST :
        !           115:                message("Target machine can not handle remote talk");
        !           116:                break;
        !           117: 
        !           118:            case FAILED :
        !           119:                message("Target machine is too confused to talk to us");
        !           120:                break;
        !           121: 
        !           122:            case PERMISSION_DENIED :
        !           123:                message("Your party is refusing messages");
        !           124:                break;
        !           125:        }
        !           126: 
        !           127:        quit();
        !           128:     }
        !           129: 
        !           130:        /* leave the actual invitation on my talk daemon */
        !           131: 
        !           132:     ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
        !           133:     local_id = response.id_num;
        !           134: }
        !           135:     
        !           136: send_delete()
        !           137: {
        !           138:        /* tell the daemon to remove your invitation */
        !           139: 
        !           140:     msg.type = DELETE;
        !           141: 
        !           142:        /* this is just a extra clean up, so just send it
        !           143:           and don't wait for an answer */
        !           144: 
        !           145:     msg.id_num = remote_id;
        !           146:     daemon_addr.sin_addr = his_machine_addr;
        !           147:     if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, &daemon_addr,
        !           148:                    sizeof(daemon_addr)) != sizeof(CTL_MSG)) {
        !           149:            perror("send_delete remote");
        !           150:     }
        !           151: 
        !           152:     msg.id_num = local_id;
        !           153:     daemon_addr.sin_addr = my_machine_addr;
        !           154:     if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, &daemon_addr,
        !           155:                    sizeof(daemon_addr)) != sizeof(CTL_MSG)) {
        !           156:            perror("send_delete local");
        !           157:     }
        !           158: }

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