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Annotation of 43BSD/ucb/talk/get_addrs.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[] = "@(#)get_addrs.c        5.2 (Berkeley) 3/13/86";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk_ctl.h"
        !            12: #include <netdb.h>
        !            13: 
        !            14: get_addrs(my_machine_name, his_machine_name)
        !            15:        char *my_machine_name, *his_machine_name;
        !            16: {
        !            17:        struct hostent *hp;
        !            18:        struct servent *sp;
        !            19: 
        !            20:        msg.pid = htonl(getpid());
        !            21:        /* look up the address of the local host */
        !            22:        hp = gethostbyname(my_machine_name);
        !            23:        if (hp == (struct hostent *) 0) {
        !            24:                fprintf(stderr,
        !            25:                    "talk: %s: Can't figure out network address.\n",
        !            26:                    my_machine_name);
        !            27:                exit(-1);
        !            28:        }
        !            29:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
        !            30:        /*
        !            31:         * If the callee is on-machine, just copy the
        !            32:         * network address, otherwise do a lookup...
        !            33:         */
        !            34:        if (strcmp(his_machine_name, my_machine_name)) {
        !            35:                hp = gethostbyname(his_machine_name);
        !            36:                if (hp == (struct hostent *) 0 ) {
        !            37:                        fprintf(stderr,
        !            38:                            "talk: %s: Can't figure out network address.\n",
        !            39:                            his_machine_name);
        !            40:                        exit(-1);
        !            41:                }
        !            42:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        !            43:        } else
        !            44:                his_machine_addr = my_machine_addr;
        !            45:        /* find the server's port */
        !            46:        sp = getservbyname("ntalk", "udp");
        !            47:        if (sp == 0) {
        !            48:                fprintf(stderr, "talk: %s/%s: service is not registered.\n",
        !            49:                     "ntalk", "udp");
        !            50:                exit(-1);
        !            51:        }
        !            52:        daemon_port = sp->s_port;
        !            53: }

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