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Annotation of 43BSDTahoe/ucb/talk/get_addrs.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[] = "@(#)get_addrs.c        5.4 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "talk_ctl.h"
                     23: #include <netdb.h>
                     24: 
                     25: get_addrs(my_machine_name, his_machine_name)
                     26:        char *my_machine_name, *his_machine_name;
                     27: {
                     28:        struct hostent *hp;
                     29:        struct servent *sp;
                     30: 
                     31:        msg.pid = htonl(getpid());
                     32:        /* look up the address of the local host */
                     33:        hp = gethostbyname(my_machine_name);
                     34:        if (hp == (struct hostent *) 0) {
                     35:                fprintf(stderr,
                     36:                    "talk: %s: Can't figure out network address.\n",
                     37:                    my_machine_name);
                     38:                exit(-1);
                     39:        }
                     40:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
                     41:        /*
                     42:         * If the callee is on-machine, just copy the
                     43:         * network address, otherwise do a lookup...
                     44:         */
                     45:        if (strcmp(his_machine_name, my_machine_name)) {
                     46:                hp = gethostbyname(his_machine_name);
                     47:                if (hp == (struct hostent *) 0 ) {
                     48:                        fprintf(stderr,
                     49:                            "talk: %s: Can't figure out network address.\n",
                     50:                            his_machine_name);
                     51:                        exit(-1);
                     52:                }
                     53:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
                     54:        } else
                     55:                his_machine_addr = my_machine_addr;
                     56:        /* find the server's port */
                     57:        sp = getservbyname("ntalk", "udp");
                     58:        if (sp == 0) {
                     59:                fprintf(stderr, "talk: %s/%s: service is not registered.\n",
                     60:                     "ntalk", "udp");
                     61:                exit(-1);
                     62:        }
                     63:        daemon_port = sp->s_port;
                     64: }

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