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Annotation of 43BSD/ucb/talk/look_up.c, revision 1.1.1.1

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: }

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