gui:linux: Show plugin stdout/stderr in pcsx2 console

Behaviour is now similar to Windows, except we can also show messages in
the terminal as well.

pcsx2/CMakeLists.txt

@@ -394,6 +394,7 @@ set(pcsx2IPUHeaders
 
 # Linux sources
 set(pcsx2LinuxSources
+	Linux/LnxConsolePipe.cpp
 	Linux/LnxKeyCodes.cpp
     Linux/LnxFlatFileReader.cpp
     )

pcsx2/Linux/LnxConsolePipe.cpp

@@ -0,0 +1,191 @@
+/*  PCSX2 - PS2 Emulator for PCs
+ *  Copyright (C) 2002-2015  PCSX2 Dev Team
+ *
+ *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU Lesser General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with PCSX2.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "PrecompiledHeader.h"
+
+#include "App.h"
+#include "ConsoleLogger.h"
+#include <unistd.h>
+
+using namespace Threading;
+
+// Reads data sent to stdout/stderr and sends it to the PCSX2 console.
+class LinuxPipeThread : public pxThread
+{
+	typedef pxThread _parent;
+
+protected:
+	const int& m_read_fd;
+	const ConsoleColors m_color;
+
+	void ExecuteTaskInThread();
+public:
+	LinuxPipeThread(const int& read_fd, ConsoleColors color);
+	virtual ~LinuxPipeThread() noexcept;
+};
+
+LinuxPipeThread::LinuxPipeThread(const int& read_fd, ConsoleColors color)
+	: pxThread(color == Color_Red ? L"Redirect_Stderr" : L"Redirect_Stdout")
+	, m_read_fd(read_fd)
+	, m_color(color)
+{
+}
+
+LinuxPipeThread::~LinuxPipeThread() noexcept
+{
+	_parent::Cancel();
+}
+
+void LinuxPipeThread::ExecuteTaskInThread()
+{
+	char buffer[2049];
+	while (ssize_t bytes_read = read(m_read_fd, buffer, sizeof(buffer) - 1)) {
+		TestCancel();
+
+		if (bytes_read == -1) {
+			if (errno == EINTR) {
+				continue;
+			}
+			else {
+				// Should never happen.
+				Console.Error(wxString::Format(L"Redirect %s failed: read: %s",
+					m_color == Color_Red ? L"stderr" : L"stdout", strerror(errno)));
+				break;
+			}
+		}
+
+		buffer[bytes_read] = 0;
+
+		{
+			ConsoleColorScope cs(m_color);
+			Console.WriteRaw(fromUTF8(buffer));
+		}
+
+		TestCancel();
+	}
+}
+
+// Redirects data sent to stdout/stderr into a pipe, and sets up a thread to
+// forward data to the console.
+class LinuxPipeRedirection : public PipeRedirectionBase
+{
+	DeclareNoncopyableObject(LinuxPipeRedirection);
+
+protected:
+	FILE* m_stdstream;
+	FILE* m_fp;
+	int m_pipe_fd[2];
+	LinuxPipeThread m_thread;
+
+	void Cleanup() noexcept;
+public:
+	LinuxPipeRedirection(FILE* stdstream);
+	virtual ~LinuxPipeRedirection() noexcept;
+};
+
+LinuxPipeRedirection::LinuxPipeRedirection(FILE* stdstream)
+	: m_stdstream(stdstream)
+	, m_fp(nullptr)
+	, m_pipe_fd{-1, -1}
+	, m_thread(m_pipe_fd[0], stdstream == stderr ? Color_Red : Color_Black)
+{
+	pxAssert((stdstream == stderr) || (stdstream == stdout));
+
+	const wxChar* stream_name = stdstream == stderr? L"stderr" : L"stdout";
+
+	try {
+		int stdstream_fd = fileno(stdstream);
+
+		// Save the original stdout/stderr file descriptor...
+		int dup_fd = dup(stdstream_fd);
+		if (dup_fd == -1)
+			throw Exception::RuntimeError().SetDiagMsg(wxString::Format(
+				L"Redirect %s failed: dup: %s", stream_name, strerror(errno)));
+		m_fp = fdopen(dup_fd, "w");
+		if (m_fp == nullptr)
+			throw Exception::RuntimeError().SetDiagMsg(wxString::Format(
+				L"Redirect %s failed: fdopen: %s", stream_name, strerror(errno)));
+
+		// and now redirect stdout/stderr.
+		if (pipe(m_pipe_fd) == -1)
+			throw Exception::RuntimeError().SetDiagMsg(wxString::Format(
+				L"Redirect %s failed: pipe: %s", stream_name, strerror(errno)));
+		if (dup2(m_pipe_fd[1], stdstream_fd) != stdstream_fd)
+			throw Exception::RuntimeError().SetDiagMsg(wxString::Format(
+				L"Redirect %s failed: dup2: %s", stream_name, strerror(errno)));
+		close(m_pipe_fd[1]);
+		m_pipe_fd[1] = stdstream_fd;
+
+		// And send the final console output goes to the original stdout,
+		// otherwise we'll have an infinite data loop.
+		if (stdstream == stdout)
+			Console_SetStdout(m_fp);
+
+		m_thread.Start();
+	} catch (Exception::BaseThreadError& ex) {
+		// thread object will become invalid because of scoping after we leave
+		// the constructor, so re-pack a new exception:
+		Cleanup();
+		throw Exception::RuntimeError().SetDiagMsg(ex.FormatDiagnosticMessage());
+	} catch (...) {
+		Cleanup();
+		throw;
+	}
+}
+
+LinuxPipeRedirection::~LinuxPipeRedirection() noexcept
+{
+	Cleanup();
+}
+
+void LinuxPipeRedirection::Cleanup() noexcept
+{
+	// Restore stdout/stderr file descriptor - mostly useful if the thread
+	// fails to start, but then you have bigger issues to worry about.
+	if (m_pipe_fd[1] != -1) {
+		if (m_pipe_fd[1] == fileno(m_stdstream)) {
+			// FIXME: Use lock for better termination.
+			// The redirect thread is most likely waiting at read(). Send a
+			// newline so it returns and the thread begins to terminate.
+			fflush(m_stdstream);
+			m_thread.Cancel();
+			fputc('\n', m_stdstream);
+			fflush(m_stdstream);
+			dup2(fileno(m_fp), fileno(m_stdstream));
+		} else {
+			close(m_pipe_fd[1]);
+		}
+	}
+
+	if (m_fp != nullptr) {
+		if (m_stdstream == stdout)
+			Console_SetStdout(stdout);
+		fclose(m_fp);
+	}
+
+	if (m_pipe_fd[0] != -1)
+		close(m_pipe_fd[0]);
+}
+
+PipeRedirectionBase* NewPipeRedir(FILE* stdstream)
+{
+	try {
+		return new LinuxPipeRedirection(stdstream);
+	} catch (Exception::RuntimeError& ex) {
+		Console.Error(ex.FormatDiagnosticMessage());
+	}
+
+	return nullptr;
+}

pcsx2/Linux/LnxKeyCodes.cpp

@@ -294,13 +294,3 @@ int TranslateGDKtoWXK( u32 keysym )
 
     return key_code;
 }
-
-// NewPipeRedir .. Homeless function for now .. This is as good a spot as any.
-//   Eventually we might be so fancy as to have a linux console pipe to our own console
-//   window, same as the Win32 one.  Not sure how doable it is, and it's not as urgent
-//   anyway since Linux has better generic console support and commandline piping.
-//
-PipeRedirectionBase* NewPipeRedir( FILE* stdstream )
-{
-	return NULL;
-}

pcsx2/windows/VCprojects/pcsx2.vcxproj

@@ -438,6 +438,9 @@
     <ClCompile Include="..\..\gui\Panels\GameDatabasePanel.cpp" />
     <ClCompile Include="..\..\gui\Panels\MemoryCardListView.cpp" />
     <ClCompile Include="..\..\IPU\IPUdma.cpp" />
+    <ClCompile Include="..\..\Linux\LnxConsolePipe.cpp">
+      <ExcludedFromBuild>true</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="..\..\MultipartFileReader.cpp" />
     <ClCompile Include="..\..\Patch.cpp" />
     <ClCompile Include="..\..\Patch_Memory.cpp" />

pcsx2/windows/VCprojects/pcsx2.vcxproj.filters

@@ -874,6 +874,9 @@
     <ClCompile Include="..\Optimus.cpp">
       <Filter>AppHost\Win32</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\Linux\LnxConsolePipe.cpp">
+      <Filter>AppHost\Linux</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\Patch.h">