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
HandleSIG(int signal)36 mDNSlocal void HandleSIG(int signal)
37 {
38 (void)signal; // Unused
39 debugf("%s","");
40 debugf("HandleSIG");
41 StopNow = mDNStrue;
42 }
43
ExampleClientEventLoop(mDNS * const m)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