1 /*
2 * libjingle
3 * Copyright 2004--2013, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 // TODO(pmclean): Perhaps this should be unified with examples/call/console.cc
29 // and refactor to talk/base.
30 #include "talk/examples/chat/consoletask.h"
31
32 #define _CRT_SECURE_NO_DEPRECATE 1
33
34 #include <stdarg.h>
35 #ifdef POSIX
36 #include <signal.h>
37 #include <termios.h>
38 #include <unistd.h>
39 #endif // POSIX
40 #include <cassert>
41
42 #include "talk/base/logging.h"
43
44 #ifdef POSIX
DoNothing(int unused)45 static void DoNothing(int unused) {}
46 #endif
47
48 namespace buzz {
49
ConsoleTask(talk_base::Thread * thread)50 ConsoleTask::ConsoleTask(talk_base::Thread *thread) :
51 client_thread_(thread),
52 console_thread_(new talk_base::Thread()) {
53 }
54
~ConsoleTask()55 ConsoleTask::~ConsoleTask() {
56 Stop();
57 }
58
Start()59 void ConsoleTask::Start() {
60 if (!console_thread_) {
61 // stdin was closed in Stop(), so we can't restart.
62 LOG(LS_ERROR) << "Cannot re-start";
63 return;
64 }
65 if (console_thread_->started()) {
66 LOG(LS_WARNING) << "Already started";
67 return;
68 }
69 console_thread_->Start();
70 console_thread_->Post(this, MSG_START);
71 }
72
Stop()73 void ConsoleTask::Stop() {
74 if (console_thread_ && console_thread_->started()) {
75 #ifdef WIN32
76 CloseHandle(GetStdHandle(STD_INPUT_HANDLE));
77 #else
78 close(fileno(stdin));
79 // This forces the read() in fgets() to return with errno = EINTR. fgets()
80 // will retry the read() and fail, thus returning.
81 pthread_kill(console_thread_->GetPThread(), SIGUSR1);
82 #endif
83 console_thread_->Stop();
84 console_thread_.reset();
85 }
86 }
87
SetEcho(bool on)88 void ConsoleTask::SetEcho(bool on) {
89 #ifdef WIN32
90 HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
91 if ((hIn == INVALID_HANDLE_VALUE) || (hIn == NULL))
92 return;
93
94 DWORD mode;
95 if (!GetConsoleMode(hIn, &mode))
96 return;
97
98 if (on) {
99 mode = mode | ENABLE_ECHO_INPUT;
100 } else {
101 mode = mode & ~ENABLE_ECHO_INPUT;
102 }
103
104 SetConsoleMode(hIn, mode);
105 #else // MAC & LINUX
106 const int fd = fileno(stdin);
107 if (fd == -1) {
108 return;
109 }
110
111 struct termios tcflags;
112 if (tcgetattr(fd, &tcflags) == -1) {
113 return;
114 }
115
116 if (on) {
117 tcflags.c_lflag |= ECHO;
118 } else {
119 tcflags.c_lflag &= ~ECHO;
120 }
121
122 tcsetattr(fd, TCSANOW, &tcflags);
123 #endif
124 }
125
Print(const char * format,...)126 void ConsoleTask::Print(const char* format, ...) {
127 va_list ap;
128 va_start(ap, format);
129
130 char buf[4096];
131 int size = vsnprintf(buf, sizeof(buf), format, ap);
132 assert(size >= 0);
133 assert(size < static_cast<int>(sizeof(buf)));
134 buf[size] = '\0';
135 printf("%s", buf);
136 fflush(stdout);
137
138 va_end(ap);
139 }
140
RunConsole()141 void ConsoleTask::RunConsole() {
142 char input_buffer[128];
143 while (fgets(input_buffer, sizeof(input_buffer), stdin) != NULL) {
144 client_thread_->Post(this, MSG_INPUT,
145 new talk_base::TypedMessageData<std::string>(input_buffer));
146 }
147 }
148
OnMessage(talk_base::Message * msg)149 void ConsoleTask::OnMessage(talk_base::Message *msg) {
150 switch (msg->message_id) {
151 case MSG_START:
152 #ifdef POSIX
153 // Install a no-op signal so that we can abort RunConsole() by raising
154 // SIGUSR1.
155 struct sigaction act;
156 act.sa_handler = &DoNothing;
157 sigemptyset(&act.sa_mask);
158 act.sa_flags = 0;
159 if (sigaction(SIGUSR1, &act, NULL) < 0) {
160 LOG(LS_WARNING) << "Can't install signal";
161 }
162 #endif
163 RunConsole();
164 break;
165
166 case MSG_INPUT:
167 talk_base::TypedMessageData<std::string> *data =
168 static_cast<talk_base::TypedMessageData<std::string>*>(msg->pdata);
169 // Trim off the .line-terminator to make processing easier.
170 std::string parsed_message =
171 data->data().substr(0, data->data().length() - 1);
172 TextInputHandler(parsed_message);
173 break;
174 }
175 }
176
177 } // namespace buzz
178