mDNSPosix/ExampleClientApp.c

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