147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt/* -*- Mode: C; tab-width: 4 -*- 247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. 447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Licensed under the Apache License, Version 2.0 (the "License"); 647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * you may not use this file except in compliance with the License. 747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * You may obtain a copy of the License at 847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * http://www.apache.org/licenses/LICENSE-2.0 1047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 1147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Unless required by applicable law or agreed to in writing, software 1247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * distributed under the License is distributed on an "AS IS" BASIS, 1347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * See the License for the specific language governing permissions and 1547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * limitations under the License. 1647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt */ 1747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 1847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <stdio.h> // For printf() 1947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <stdlib.h> // For exit() etc. 2047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <string.h> // For strlen() etc. 2147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <unistd.h> // For select() 2247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <errno.h> // For errno, EINTR 2347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <netinet/in.h> // For INADDR_NONE 2447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <arpa/inet.h> // For inet_addr() 2547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <netdb.h> // For gethostbyname() 2647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include <signal.h> // For SIGINT, etc. 2747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 2847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include "mDNSEmbeddedAPI.h" // Defines the interface to the client layer above 2947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include "mDNSPosix.h" // Defines the specific types needed to run mDNS on this platform 3047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 3147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt//******************************************************************************************* 3247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// Main 3347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 3447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltstatic volatile mDNSBool StopNow; 3547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 3647e4cebad7397422144bb03a21f3f7682c062c4aRobert GreenwaltmDNSlocal void HandleSIG(int signal) 3747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 3847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (void)signal; // Unused 3947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt debugf("%s",""); 4047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt debugf("HandleSIG"); 4147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt StopNow = mDNStrue; 4247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 4347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 4447e4cebad7397422144bb03a21f3f7682c062c4aRobert GreenwaltmDNSexport void ExampleClientEventLoop(mDNS *const m) 4547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 4647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt signal(SIGINT, HandleSIG); // SIGINT is what you get for a Ctrl-C 4747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt signal(SIGTERM, HandleSIG); 4847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 4947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt while (!StopNow) 5047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 5147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt int nfds = 0; 5247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt fd_set readfds; 5347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt struct timeval timeout; 5447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt int result; 5547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 5647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 1. Set up the fd_set as usual here. 5747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // This example client has no file descriptors of its own, 5847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // but a real application would call FD_SET to add them to the set here 5947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt FD_ZERO(&readfds); 6047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 6147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 2. Set up the timeout. 6247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // This example client has no other work it needs to be doing, 6347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // so we set an effectively infinite timeout 6447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt timeout.tv_sec = 0x3FFFFFFF; 6547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt timeout.tv_usec = 0; 6647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 6747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 3. Give the mDNSPosix layer a chance to add its information to the fd_set and timeout 6847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt mDNSPosixGetFDSet(m, &nfds, &readfds, &timeout); 6947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 7047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 4. Call select as normal 7147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt verbosedebugf("select(%d, %d.%06d)", nfds, timeout.tv_sec, timeout.tv_usec); 7247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt result = select(nfds, &readfds, NULL, NULL, &timeout); 7347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 7447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt if (result < 0) 7547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 7647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt verbosedebugf("select() returned %d errno %d", result, errno); 7747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt if (errno != EINTR) StopNow = mDNStrue; 7847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 7947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt else 8047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 8147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 5. Call mDNSPosixProcessFDSet to let the mDNSPosix layer do its work 8247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt mDNSPosixProcessFDSet(m, &readfds); 8347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 8447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // 6. This example client has no other work it needs to be doing, 8547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // but a real client would do its work here 8647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt // ... (do work) ... 8747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 8847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 8947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 9047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt debugf("Exiting"); 9147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 92