mDNSPosix/ExampleClientApp.c

   1 /*
   2  * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24
  25     Change History (most recent first):
  26
  27 $Log: ExampleClientApp.c,v $
  28 Revision 1.9  2003/08/12 19:56:26  cheshire
  29 Update to APSL 2.0
  30
  31 Revision 1.8  2003/07/02 21:19:58  cheshire
  32 <rdar://problem/3313413> Update copyright notices, etc., in source code comments
  33
  34 Revision 1.7  2003/06/18 05:48:41  cheshire
  35 Fix warnings
  36
  37 Revision 1.6  2003/03/31 22:44:36  cheshire
  38 Add log header
  39
  40  */
  41
  42 #include <stdio.h>                      // For printf()
  43 #include <stdlib.h>                     // For exit() etc.
  44 #include <string.h>                     // For strlen() etc.
  45 #include <unistd.h>                     // For select()
  46 #include <errno.h>                      // For errno, EINTR
  47 #include <arpa/inet.h>          // For inet_addr()
  48 #include <netinet/in.h>         // For INADDR_NONE
  49 #include <netdb.h>                      // For gethostbyname()
  50 #include <signal.h>                     // For SIGINT, etc.
  51
  52 #include "mDNSClientAPI.h"  // Defines the interface to the client layer above
  53 #include "mDNSPosix.h"      // Defines the specific types needed to run mDNS on this platform
  54
  55 //*******************************************************************************************
  56 // Main
  57
  58 static volatile mDNSBool StopNow;
  59
  60 mDNSlocal void HandleSIG(int signal)
  61         {
  62         (void)signal;   // Unused
  63         debugf("");
  64         debugf("HandleSIG");
  65         StopNow = mDNStrue;
  66         }
  67
  68 mDNSexport void ExampleClientEventLoop(mDNS *const m)
  69         {
  70         signal(SIGINT, HandleSIG);      // SIGINT is what you get for a Ctrl-C
  71         signal(SIGTERM, HandleSIG);
  72
  73         while (!StopNow)
  74                 {
  75                 int nfds = 0;
  76                 fd_set readfds;
  77                 struct timeval timeout;
  78                 int result;
  79
  80                 // 1. Set up the fd_set as usual here.
  81                 // This example client has no file descriptors of its own,
  82                 // but a real application would call FD_SET to add them to the set here
  83                 FD_ZERO(&readfds);
  84
  85                 // 2. Set up the timeout.
  86                 // This example client has no other work it needs to be doing,
  87                 // so we set an effectively infinite timeout
  88                 timeout.tv_sec = 0x3FFFFFFF;
  89                 timeout.tv_usec = 0;
  90
  91                 // 3. Give the mDNSPosix layer a chance to add its information to the fd_set and timeout
  92                 mDNSPosixGetFDSet(m, &nfds, &readfds, &timeout);
  93
  94                 // 4. Call select as normal
  95                 verbosedebugf("select(%d, %d.%06d)", nfds, timeout.tv_sec, timeout.tv_usec);
  96                 result = select(nfds, &readfds, NULL, NULL, &timeout);
  97
  98                 if (result < 0)
  99                         {
 100                         verbosedebugf("select() returned %d errno %d", result, errno);
 101                         if (errno != EINTR) StopNow = mDNStrue;
 102                         }
 103                 else
 104                         {
 105                         // 5. Call mDNSPosixProcessFDSet to let the mDNSPosix layer do its work
 106                         mDNSPosixProcessFDSet(m, &readfds);
 107
 108                         // 6. This example client has no other work it needs to be doing,
 109                         // but a real client would do its work here
 110                         // ... (do work) ...
 111                         }
 112                 }
 113
 114         debugf("Exiting");
 115         }