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Annotation of cci/usr/src/ucb/talk/invite.c, revision 1.1

1.1     ! root        1: /* $Header: invite.c,v 1.2 85/01/09 13:04:57 rcs 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: int    vaxbyteorder;           /* if set, messages are sent in vax-byte-order*/
        !            22: int    tonetmsg();
        !            23: int    tonetresp();
        !            24: 
        !            25: invite_remote()
        !            26: {
        !            27:     int nfd, read_mask, template, new_sockt;
        !            28:     struct itimerval itimer;
        !            29:     CTL_RESPONSE response;
        !            30: 
        !            31:     itimer.it_value.tv_sec = RING_WAIT;
        !            32:     itimer.it_value.tv_usec = 0;
        !            33:     itimer.it_interval = itimer.it_value;
        !            34: 
        !            35:     if (listen(sockt, 5) != 0) {
        !            36:        p_error("Error on attempt to listen for caller");
        !            37:     }
        !            38: 
        !            39:     msg.ctlm_addr = my_addr;
        !            40:     msg.ctlm_id_num = -1;              /* an impossible id_num */
        !            41: 
        !            42:     invitation_waiting = 1;
        !            43: 
        !            44:     announce_invite();
        !            45: 
        !            46:        /*
        !            47:         * shut off the automatic messages for a while,
        !            48:         * so we can use the interupt timer to resend the invitation
        !            49:         */
        !            50: 
        !            51:     end_msgs();
        !            52:     setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
        !            53:     message("Waiting for your party to respond");
        !            54:     signal(SIGALRM, re_invite);
        !            55:     (void) setjmp(invitebuf);
        !            56: 
        !            57:     while ((new_sockt = accept(sockt, 0, 0)) < 0) {
        !            58:        if (errno != EINTR) {
        !            59:            p_error("Unable to connect with your party");
        !            60:        } else {
        !            61:            /* we just returned from a interupt, keep trying */
        !            62:            continue;
        !            63:        }
        !            64:     }
        !            65: 
        !            66:     close(sockt);
        !            67:     sockt = new_sockt;
        !            68: 
        !            69:        /* have the daemons delete the invitations now that we
        !            70:           have connected.
        !            71:         */
        !            72: 
        !            73:     current_state = "Waiting for your party to respond";
        !            74:     start_msgs();
        !            75: 
        !            76:     msg.ctlm_id_num = local_id;
        !            77:     ctl_transact(my_machine_addr, msg, DELETE, &response);
        !            78:     msg.ctlm_id_num = remote_id;
        !            79:     ctl_transact(his_machine_addr, msg, DELETE, &response);
        !            80:     invitation_waiting = 0;
        !            81: }
        !            82: 
        !            83:     /* routine called on interupt to re-invite the callee */
        !            84: 
        !            85: void re_invite()
        !            86: {
        !            87:     message("Ringing your party again");
        !            88:     current_line++;
        !            89:        /* force a re-announce */
        !            90:     msg.ctlm_id_num = remote_id + 1;
        !            91:     announce_invite();
        !            92:     longjmp(invitebuf, 1);
        !            93: }
        !            94: 
        !            95:     /* transmit the invitation and process the response */
        !            96: 
        !            97: announce_invite()
        !            98: {
        !            99:     CTL_RESPONSE response;
        !           100: 
        !           101:     current_state = "Trying to connect to your party's talk daemon";
        !           102: 
        !           103:     ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
        !           104:     remote_id = response.ctlr_id_num;
        !           105: 
        !           106:     if (response.ctlr_answer != SUCCESS) {
        !           107: 
        !           108:        switch (response.ctlr_answer) {
        !           109:            
        !           110:            case NOT_HERE :
        !           111:                message("Your party is not logged on");
        !           112:                break;
        !           113: 
        !           114:            case MACHINE_UNKNOWN :
        !           115:                message("Target machine does not recognize us");
        !           116:                break;
        !           117: 
        !           118:            case UNKNOWN_REQUEST :
        !           119:                message("Target machine can not handle remote talk");
        !           120:                break;
        !           121: 
        !           122:            case FAILED :
        !           123:                message("Target machine is too confused to talk to us");
        !           124:                break;
        !           125: 
        !           126:            case PERMISSION_DENIED :
        !           127:                message("Your party is refusing messages");
        !           128:                break;
        !           129:        }
        !           130: 
        !           131:        quit();
        !           132:     }
        !           133: 
        !           134:        /* leave the actual invitation on my talk daemon */
        !           135: 
        !           136: #ifdef DEBUG
        !           137:     printf("tell my daemon\n");
        !           138: #endif
        !           139:     ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
        !           140:     local_id = response.ctlr_id_num;
        !           141: }
        !           142:     
        !           143: send_delete()
        !           144: {
        !           145:     NETCTL_MSG netmsg;         /* for conversion to VAX Berkeley format */
        !           146: 
        !           147:        /* tell the daemon to remove your invitation */
        !           148: 
        !           149:     msg.ctlm_type = DELETE;
        !           150: 
        !           151:        /* this is just a extra clean up, so just send it
        !           152:           and don't wait for an answer */
        !           153: 
        !           154:     msg.ctlm_id_num = remote_id;
        !           155:     daemon_addr.sin_addr = his_machine_addr;
        !           156:     tonetmsg(&msg, &netmsg, vaxbyteorder);
        !           157:     if (sendto(ctl_sockt, &netmsg, sizeof(netmsg), 0, &daemon_addr,
        !           158:                    sizeof(daemon_addr)) != sizeof(netmsg)) {
        !           159:            perror("send_delete remote");
        !           160:     }
        !           161: 
        !           162:     msg.ctlm_id_num = local_id;
        !           163:     daemon_addr.sin_addr = my_machine_addr;
        !           164:     tonetmsg(&msg, &netmsg, vaxbyteorder);
        !           165:     if (sendto(ctl_sockt, &netmsg, sizeof(netmsg), 0, &daemon_addr,
        !           166:                    sizeof(daemon_addr)) != sizeof(netmsg)) {
        !           167:            perror("send_delete local");
        !           168:     }
        !           169: }

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