Return to look_up.c CVS log

Up to [CSRG BSD Unix] / 43BSD / ucb / talk

Annotation of 43BSD/ucb/talk/look_up.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)look_up.c  5.2 (Berkeley) 3/13/86";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk_ctl.h"
        !            12: 
        !            13: /*
        !            14:  * See if the local daemon has an invitation for us.
        !            15:  */
        !            16: check_local()
        !            17: {
        !            18:        CTL_RESPONSE response;
        !            19:        register CTL_RESPONSE *rp = &response;
        !            20: 
        !            21:        /* the rest of msg was set up in get_names */
        !            22:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
        !            23:        msg.ctl_addr.sa_family = htons(msg.ctl_addr.sa_family);
        !            24:        /* must be initiating a talk */
        !            25:        if (!look_for_invite(rp))
        !            26:                return (0);
        !            27:        /*
        !            28:         * There was an invitation waiting for us, 
        !            29:         * so connect with the other (hopefully waiting) party 
        !            30:         */
        !            31:        current_state = "Waiting to connect with caller";
        !            32:        do {
        !            33:                if (rp->addr.sa_family != AF_INET)
        !            34:                        p_error("Response uses invalid network address");
        !            35:                errno = 0;
        !            36:                if (connect(sockt, &rp->addr, sizeof (rp->addr)) != -1)
        !            37:                        return (1);
        !            38:        } while (errno == EINTR);
        !            39:        if (errno == ECONNREFUSED) {
        !            40:                /*
        !            41:                 * The caller gave up, but his invitation somehow
        !            42:                 * was not cleared. Clear it and initiate an 
        !            43:                 * invitation. (We know there are no newer invitations,
        !            44:                 * the talkd works LIFO.)
        !            45:                 */
        !            46:                ctl_transact(his_machine_addr, msg, DELETE, rp);
        !            47:                close(sockt);
        !            48:                open_sockt();
        !            49:                return (0);
        !            50:        }
        !            51:        p_error("Unable to connect with initiator");
        !            52:        /*NOTREACHED*/
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * Look for an invitation on 'machine'
        !            57:  */
        !            58: look_for_invite(rp)
        !            59:        CTL_RESPONSE *rp;
        !            60: {
        !            61:        struct in_addr machine_addr;
        !            62: 
        !            63:        current_state = "Checking for invitation on caller's machine";
        !            64:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
        !            65:        /* the switch is for later options, such as multiple invitations */
        !            66:        switch (rp->answer) {
        !            67: 
        !            68:        case SUCCESS:
        !            69:                msg.id_num = htonl(rp->id_num);
        !            70:                return (1);
        !            71: 
        !            72:        default:
        !            73:                /* there wasn't an invitation waiting for us */
        !            74:                return (0);
        !            75:        }
        !            76: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.