mDNSResponder-58.tar.gz

[apple/mdnsresponder.git] / mDNSPosix / ExampleClientApp.c

diff --git a/mDNSPosix/ExampleClientApp.c b/mDNSPosix/ExampleClientApp.c
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+/*
+ * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+
+    Change History (most recent first):
+
+$Log: ExampleClientApp.c,v $
+Revision 1.9  2003/08/12 19:56:26  cheshire
+Update to APSL 2.0
+
+Revision 1.8  2003/07/02 21:19:58  cheshire
+<rdar://problem/3313413> Update copyright notices, etc., in source code comments
+
+Revision 1.7  2003/06/18 05:48:41  cheshire
+Fix warnings
+
+Revision 1.6  2003/03/31 22:44:36  cheshire
+Add log header
+
+ */
+
+#include <stdio.h>                     // For printf()
+#include <stdlib.h>                    // For exit() etc.
+#include <string.h>                    // For strlen() etc.
+#include <unistd.h>                    // For select()
+#include <errno.h>                     // For errno, EINTR
+#include <arpa/inet.h>         // For inet_addr()
+#include <netinet/in.h>                // For INADDR_NONE
+#include <netdb.h>                     // For gethostbyname()
+#include <signal.h>                    // For SIGINT, etc.
+
+#include "mDNSClientAPI.h"  // Defines the interface to the client layer above
+#include "mDNSPosix.h"      // Defines the specific types needed to run mDNS on this platform
+
+//*******************************************************************************************
+// Main
+
+static volatile mDNSBool StopNow;
+
+mDNSlocal void HandleSIG(int signal)
+       {
+       (void)signal;   // Unused
+       debugf("");
+       debugf("HandleSIG");
+       StopNow = mDNStrue;
+       }
+
+mDNSexport void ExampleClientEventLoop(mDNS *const m)
+       {
+       signal(SIGINT, HandleSIG);      // SIGINT is what you get for a Ctrl-C
+       signal(SIGTERM, HandleSIG);
+
+       while (!StopNow)
+               {
+               int nfds = 0;
+               fd_set readfds;
+               struct timeval timeout;
+               int result;
+               
+               // 1. Set up the fd_set as usual here.
+               // This example client has no file descriptors of its own,
+               // but a real application would call FD_SET to add them to the set here
+               FD_ZERO(&readfds);
+               
+               // 2. Set up the timeout.
+               // This example client has no other work it needs to be doing,
+               // so we set an effectively infinite timeout
+               timeout.tv_sec = 0x3FFFFFFF;
+               timeout.tv_usec = 0;
+               
+               // 3. Give the mDNSPosix layer a chance to add its information to the fd_set and timeout
+               mDNSPosixGetFDSet(m, &nfds, &readfds, &timeout);
+               
+               // 4. Call select as normal
+               verbosedebugf("select(%d, %d.%06d)", nfds, timeout.tv_sec, timeout.tv_usec);
+               result = select(nfds, &readfds, NULL, NULL, &timeout);
+               
+               if (result < 0)
+                       {
+                       verbosedebugf("select() returned %d errno %d", result, errno);
+                       if (errno != EINTR) StopNow = mDNStrue;
+                       }
+               else
+                       {
+                       // 5. Call mDNSPosixProcessFDSet to let the mDNSPosix layer do its work
+                       mDNSPosixProcessFDSet(m, &readfds);
+                       
+                       // 6. This example client has no other work it needs to be doing,
+                       // but a real client would do its work here
+                       // ... (do work) ...
+                       }
+               }
+
+       debugf("Exiting");
+       }