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Annotation of 43BSD/etc/talkd/talkd.c, revision 1.1.1.1

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: char copyright[] =
                      9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
                     10:  All rights reserved.\n";
                     11: #endif not lint
                     12: 
                     13: #ifndef lint
                     14: static char sccsid[] = "@(#)talkd.c    5.2 (Berkeley) 3/13/86";
                     15: #endif not lint
                     16: 
                     17: /*
                     18:  * The top level of the daemon, the format is heavily borrowed
                     19:  * from rwhod.c. Basically: find out who and where you are; 
                     20:  * disconnect all descriptors and ttys, and then endless
                     21:  * loop on waiting for and processing requests
                     22:  */
                     23: #include <stdio.h>
                     24: #include <errno.h>
                     25: #include <signal.h>
                     26: #include <syslog.h>
                     27: 
                     28: #include <protocols/talkd.h>
                     29: 
                     30: CTL_MSG                request;
                     31: CTL_RESPONSE   response;
                     32: 
                     33: int    sockt;
                     34: int    debug = 0;
                     35: int    timeout();
                     36: long   lastmsgtime;
                     37: 
                     38: char   hostname[32];
                     39: 
                     40: #define TIMEOUT 30
                     41: #define MAXIDLE 120
                     42: 
                     43: main(argc, argv)
                     44:        int argc;
                     45:        char *argv[];
                     46: {
                     47:        register CTL_MSG *mp = &request;
                     48:        int cc;
                     49: 
                     50:        if (getuid()) {
                     51:                fprintf(stderr, "%s: getuid: not super-user", argv[0]);
                     52:                exit(1);
                     53:        }
                     54:        openlog("talkd", LOG_PID, LOG_DAEMON);
                     55:        if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
                     56:                syslog(LOG_ERR, "gethostname: %m");
                     57:                _exit(1);
                     58:        }
                     59:        if (chdir("/dev") < 0) {
                     60:                syslog(LOG_ERR, "chdir: /dev: %m");
                     61:                _exit(1);
                     62:        }
                     63:        if (argc > 1 && strcmp(argv[1], "-d") == 0)
                     64:                debug = 1;
                     65:        signal(SIGALRM, timeout);
                     66:        alarm(TIMEOUT);
                     67:        for (;;) {
                     68:                extern int errno;
                     69: 
                     70:                cc = recv(0, (char *)mp, sizeof (*mp), 0);
                     71:                if (cc != sizeof (*mp)) {
                     72:                        if (cc < 0 && errno != EINTR)
                     73:                                syslog(LOG_WARNING, "recv: %m");
                     74:                        continue;
                     75:                }
                     76:                lastmsgtime = time(0);
                     77:                process_request(mp, &response);
                     78:                /* can block here, is this what I want? */
                     79:                cc = sendto(sockt, (char *)&response,
                     80:                    sizeof (response), 0, &mp->ctl_addr, sizeof (mp->ctl_addr));
                     81:                if (cc != sizeof (response))
                     82:                        syslog(LOG_WARNING, "sendto: %m");
                     83:        }
                     84: }
                     85: 
                     86: timeout()
                     87: {
                     88: 
                     89:        if (time(0) - lastmsgtime >= MAXIDLE)
                     90:                _exit(0);
                     91:        alarm(TIMEOUT);
                     92: }

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