1 /* -*- Mode: C; tab-width: 4 -*- 2 * 3 * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #include <stdio.h> // For printf() 19 #include <stdlib.h> // For exit() etc. 20 #include <string.h> // For strlen() etc. 21 #include <unistd.h> // For select() 22 #include <errno.h> // For errno, EINTR 23 #include <netinet/in.h> // For INADDR_NONE 24 #include <arpa/inet.h> // For inet_addr() 25 #include <netdb.h> // For gethostbyname() 26 #include <signal.h> // For SIGINT, etc. 27 28 #include "mDNSEmbeddedAPI.h" // Defines the interface to the client layer above 29 #include "mDNSPosix.h" // Defines the specific types needed to run mDNS on this platform 30 31 //******************************************************************************************* 32 // Main 33 34 static volatile mDNSBool StopNow; 35 36 mDNSlocal void HandleSIG(int signal) 37 { 38 (void)signal; // Unused 39 debugf("%s",""); 40 debugf("HandleSIG"); 41 StopNow = mDNStrue; 42 } 43 44 mDNSexport void ExampleClientEventLoop(mDNS *const m) 45 { 46 signal(SIGINT, HandleSIG); // SIGINT is what you get for a Ctrl-C 47 signal(SIGTERM, HandleSIG); 48 49 while (!StopNow) 50 { 51 int nfds = 0; 52 fd_set readfds; 53 struct timeval timeout; 54 int result; 55 56 // 1. Set up the fd_set as usual here. 57 // This example client has no file descriptors of its own, 58 // but a real application would call FD_SET to add them to the set here 59 FD_ZERO(&readfds); 60 61 // 2. Set up the timeout. 62 // This example client has no other work it needs to be doing, 63 // so we set an effectively infinite timeout 64 timeout.tv_sec = 0x3FFFFFFF; 65 timeout.tv_usec = 0; 66 67 // 3. Give the mDNSPosix layer a chance to add its information to the fd_set and timeout 68 mDNSPosixGetFDSet(m, &nfds, &readfds, &timeout); 69 70 // 4. Call select as normal 71 verbosedebugf("select(%d, %d.%06d)", nfds, timeout.tv_sec, timeout.tv_usec); 72 result = select(nfds, &readfds, NULL, NULL, &timeout); 73 74 if (result < 0) 75 { 76 verbosedebugf("select() returned %d errno %d", result, errno); 77 if (errno != EINTR) StopNow = mDNStrue; 78 } 79 else 80 { 81 // 5. Call mDNSPosixProcessFDSet to let the mDNSPosix layer do its work 82 mDNSPosixProcessFDSet(m, &readfds); 83 84 // 6. This example client has no other work it needs to be doing, 85 // but a real client would do its work here 86 // ... (do work) ... 87 } 88 } 89 90 debugf("Exiting"); 91 } 92
