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Annotation of 43BSDReno/usr.bin/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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)look_up.c  5.6 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "talk_ctl.h"
        !            25: 
        !            26: /*
        !            27:  * See if the local daemon has an invitation for us.
        !            28:  */
        !            29: check_local()
        !            30: {
        !            31:        CTL_RESPONSE response;
        !            32:        register CTL_RESPONSE *rp = &response;
        !            33: 
        !            34:        /* the rest of msg was set up in get_names */
        !            35: #ifdef MSG_EOR
        !            36:        /* copy new style sockaddr to old, swap family (short in old) */
        !            37:        msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
        !            38:        msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
        !            39: #else
        !            40:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
        !            41: #endif
        !            42:        /* must be initiating a talk */
        !            43:        if (!look_for_invite(rp))
        !            44:                return (0);
        !            45:        /*
        !            46:         * There was an invitation waiting for us, 
        !            47:         * so connect with the other (hopefully waiting) party 
        !            48:         */
        !            49:        current_state = "Waiting to connect with caller";
        !            50:        do {
        !            51:                if (rp->addr.sa_family != AF_INET)
        !            52:                        p_error("Response uses invalid network address");
        !            53:                errno = 0;
        !            54:                if (connect(sockt, &rp->addr, sizeof (rp->addr)) != -1)
        !            55:                        return (1);
        !            56:        } while (errno == EINTR);
        !            57:        if (errno == ECONNREFUSED) {
        !            58:                /*
        !            59:                 * The caller gave up, but his invitation somehow
        !            60:                 * was not cleared. Clear it and initiate an 
        !            61:                 * invitation. (We know there are no newer invitations,
        !            62:                 * the talkd works LIFO.)
        !            63:                 */
        !            64:                ctl_transact(his_machine_addr, msg, DELETE, rp);
        !            65:                close(sockt);
        !            66:                open_sockt();
        !            67:                return (0);
        !            68:        }
        !            69:        p_error("Unable to connect with initiator");
        !            70:        /*NOTREACHED*/
        !            71: }
        !            72: 
        !            73: /*
        !            74:  * Look for an invitation on 'machine'
        !            75:  */
        !            76: look_for_invite(rp)
        !            77:        CTL_RESPONSE *rp;
        !            78: {
        !            79:        struct in_addr machine_addr;
        !            80: 
        !            81:        current_state = "Checking for invitation on caller's machine";
        !            82:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
        !            83:        /* the switch is for later options, such as multiple invitations */
        !            84:        switch (rp->answer) {
        !            85: 
        !            86:        case SUCCESS:
        !            87:                msg.id_num = htonl(rp->id_num);
        !            88:                return (1);
        !            89: 
        !            90:        default:
        !            91:                /* there wasn't an invitation waiting for us */
        !            92:                return (0);
        !            93:        }
        !            94: }

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