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Annotation of 43BSDTahoe/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.
        !             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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