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Annotation of 43BSD/etc/talkd/talkd.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: 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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