2.11BSD#431 - /usr/src/libexec/talkd/talkd.c

   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: #if defined(DOSCCS) && !defined(lint)
   8: char copyright[] =
   9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: 
  12: static char sccsid[] = "@(#)talkd.c	5.2.1 (2.11BSD GTE) 1/1/94";
  13: #endif
  14: 
  15: /*
  16:  * The top level of the daemon, the format is heavily borrowed
  17:  * from rwhod.c. Basically: find out who and where you are;
  18:  * disconnect all descriptors and ttys, and then endless
  19:  * loop on waiting for and processing requests
  20:  */
  21: #include <stdio.h>
  22: #include <errno.h>
  23: #include <signal.h>
  24: #include <syslog.h>
  25: 
  26: #include <protocols/talkd.h>
  27: 
  28: CTL_MSG     request;
  29: CTL_RESPONSE    response;
  30: 
  31: int sockt;
  32: int debug = 0;
  33: int timeout();
  34: long    time();
  35: long    lastmsgtime;
  36: 
  37: char    hostname[32];
  38: 
  39: #define TIMEOUT 30
  40: #define MAXIDLE 120
  41: 
  42: main(argc, argv)
  43:     int argc;
  44:     char *argv[];
  45: {
  46:     register CTL_MSG *mp = &request;
  47:     int cc;
  48: 
  49:     if (getuid()) {
  50:         fprintf(stderr, "%s: getuid: not super-user\n", argv[0]);
  51:         exit(1);
  52:     }
  53:     openlog("talkd", LOG_PID, LOG_DAEMON);
  54:     if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
  55:         syslog(LOG_ERR, "gethostname: %m");
  56:         _exit(1);
  57:     }
  58:     if (chdir("/dev") < 0) {
  59:         syslog(LOG_ERR, "chdir: /dev: %m");
  60:         _exit(1);
  61:     }
  62:     if (argc > 1 && strcmp(argv[1], "-d") == 0)
  63:         debug = 1;
  64:     signal(SIGALRM, timeout);
  65:     alarm(TIMEOUT);
  66:     for (;;) {
  67:         extern int errno;
  68: 
  69:         cc = recv(0, (char *)mp, sizeof (*mp), 0);
  70:         if (cc != sizeof (*mp)) {
  71:             if (cc < 0 && errno != EINTR)
  72:                 syslog(LOG_WARNING, "recv: %m");
  73:             continue;
  74:         }
  75:         lastmsgtime = time(0);
  76:         process_request(mp, &response);
  77:         /* can block here, is this what I want? */
  78:         cc = sendto(sockt, (char *)&response,
  79:             sizeof (response), 0, &mp->ctl_addr, sizeof (mp->ctl_addr));
  80:         if (cc != sizeof (response))
  81:             syslog(LOG_WARNING, "sendto: %m");
  82:     }
  83: }
  84: 
  85: timeout()
  86: {
  87: 
  88:     if (time(0) - lastmsgtime >= MAXIDLE)
  89:         _exit(0);
  90:     alarm(TIMEOUT);
  91: }

Defined functions

Defined variables

Defined macros