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Annotation of 43BSDTahoe/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.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)look_up.c  5.4 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "talk_ctl.h"
                     23: 
                     24: /*
                     25:  * See if the local daemon has an invitation for us.
                     26:  */
                     27: check_local()
                     28: {
                     29:        CTL_RESPONSE response;
                     30:        register CTL_RESPONSE *rp = &response;
                     31: 
                     32:        /* the rest of msg was set up in get_names */
                     33:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
                     34:        msg.ctl_addr.sa_family = htons(msg.ctl_addr.sa_family);
                     35:        /* must be initiating a talk */
                     36:        if (!look_for_invite(rp))
                     37:                return (0);
                     38:        /*
                     39:         * There was an invitation waiting for us, 
                     40:         * so connect with the other (hopefully waiting) party 
                     41:         */
                     42:        current_state = "Waiting to connect with caller";
                     43:        do {
                     44:                if (rp->addr.sa_family != AF_INET)
                     45:                        p_error("Response uses invalid network address");
                     46:                errno = 0;
                     47:                if (connect(sockt, &rp->addr, sizeof (rp->addr)) != -1)
                     48:                        return (1);
                     49:        } while (errno == EINTR);
                     50:        if (errno == ECONNREFUSED) {
                     51:                /*
                     52:                 * The caller gave up, but his invitation somehow
                     53:                 * was not cleared. Clear it and initiate an 
                     54:                 * invitation. (We know there are no newer invitations,
                     55:                 * the talkd works LIFO.)
                     56:                 */
                     57:                ctl_transact(his_machine_addr, msg, DELETE, rp);
                     58:                close(sockt);
                     59:                open_sockt();
                     60:                return (0);
                     61:        }
                     62:        p_error("Unable to connect with initiator");
                     63:        /*NOTREACHED*/
                     64: }
                     65: 
                     66: /*
                     67:  * Look for an invitation on 'machine'
                     68:  */
                     69: look_for_invite(rp)
                     70:        CTL_RESPONSE *rp;
                     71: {
                     72:        struct in_addr machine_addr;
                     73: 
                     74:        current_state = "Checking for invitation on caller's machine";
                     75:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
                     76:        /* the switch is for later options, such as multiple invitations */
                     77:        switch (rp->answer) {
                     78: 
                     79:        case SUCCESS:
                     80:                msg.id_num = htonl(rp->id_num);
                     81:                return (1);
                     82: 
                     83:        default:
                     84:                /* there wasn't an invitation waiting for us */
                     85:                return (0);
                     86:        }
                     87: }

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