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Annotation of 43BSD/old/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        5.1 (Berkeley) 6/6/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk_ctl.h"
        !            12: 
        !            13: struct hostent *gethostbyname();
        !            14: struct servent *getservbyname();
        !            15: 
        !            16: get_addrs(my_machine_name, his_machine_name)
        !            17:        char *my_machine_name;
        !            18:        char *his_machine_name;
        !            19: {
        !            20:        struct hostent *hp;
        !            21:        struct servent *sp;
        !            22: 
        !            23:        msg.pid = getpid();
        !            24:        /* look up the address of the local host */
        !            25:        hp = gethostbyname(my_machine_name);
        !            26:        if (hp == (struct hostent *) 0) {
        !            27:                printf("This machine doesn't exist. Boy, am I confused!\n");
        !            28:                exit(-1);
        !            29:        }
        !            30:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
        !            31:        /* if he is on the same machine, then simply copy */
        !            32:        if (bcmp((char *)&his_machine_name, (char *)&my_machine_name,
        !            33:            sizeof(his_machine_name)) == 0)
        !            34:                bcopy((char *)&my_machine_addr, (char *)&his_machine_addr,
        !            35:                    sizeof(his_machine_name));
        !            36:        else {
        !            37:                /* look up the address of the recipient's machine */
        !            38:                hp = gethostbyname(his_machine_name);
        !            39:                if (hp == (struct hostent *) 0 ) {
        !            40:                        printf("%s is an unknown host\n", his_machine_name);
        !            41:                        exit(-1);
        !            42:                }
        !            43:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        !            44:        }
        !            45:        /* find the daemon portal */
        !            46:        sp = getservbyname("talk", "udp");
        !            47:        if (sp == 0) {
        !            48:                p_error("This machine doesn't support talk");
        !            49:                exit(-1);
        !            50:        }
        !            51:        daemon_port = sp->s_port;
        !            52: }

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