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361 lines
10 KiB
C++
361 lines
10 KiB
C++
// natWin32Process.cc - Native side of Win32 process code.
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/* Copyright (C) 2003, 2006, 2007 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <platform.h>
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// Conflicts with the definition in "java/lang/reflect/Modifier.h"
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#undef STRICT
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#include <java/lang/Win32Process.h>
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#include <java/lang/IllegalThreadStateException.h>
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#include <java/lang/InterruptedException.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/Thread.h>
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#include <java/io/File.h>
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#include <java/io/FileDescriptor.h>
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#include <java/io/FileInputStream.h>
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#include <java/io/FileOutputStream.h>
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#include <java/io/IOException.h>
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#include <java/lang/OutOfMemoryError.h>
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#include <java/lang/Win32Process$EOFInputStream.h>
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#include <gnu/java/nio/channels/FileChannelImpl.h>
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using gnu::java::nio::channels::FileChannelImpl;
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void
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java::lang::Win32Process::cleanup (void)
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{
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// FIXME:
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// We used to close the input, output and
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// error streams here, but we can't do that
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// because the caller also has the right
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// to close these and FileInputStream and FileOutputStream
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// scream if you attempt to close() them twice. Presently,
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// we use _Jv_platform_close_on_exec, which is similar
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// to the POSIX approach.
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//
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// What I wanted to do is have private nested
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// classes in Win32Process which extend FileInputStream
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// and FileOutputStream, respectively, but override
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// close() to permit multiple calls to close(). This
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// led to class header and platform configury issues
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// that I didn't feel like dealing with. However,
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// this approach could conceivably be a good multiplatform
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// one since delaying the pipe close until process
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// termination could be wasteful if many child processes
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// are spawned within the parent process' lifetime.
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inputStream = NULL;
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outputStream = NULL;
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errorStream = NULL;
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if (procHandle)
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{
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CloseHandle((HANDLE) procHandle);
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procHandle = (jint) INVALID_HANDLE_VALUE;
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}
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}
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void
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java::lang::Win32Process::destroy (void)
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{
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if (! hasExited ())
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{
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// Kill it forcibly and assign an (arbitrary) exit code of 0.
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TerminateProcess ((HANDLE) procHandle, 0);
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exitCode = 0;
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cleanup ();
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}
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}
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jboolean
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java::lang::Win32Process::hasExited (void)
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{
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DWORD exitStatus;
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if (GetExitCodeProcess ((HANDLE) procHandle, &exitStatus) != 0)
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{
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// NOTE: STILL_ACTIVE is defined as "259" by Win32 - if the
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// child actually exits with this return code, we have a
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// problem here. See MSDN documentation on GetExitCodeProcess( ).
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if (exitStatus == STILL_ACTIVE)
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return false;
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else
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{
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cleanup ();
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exitCode = exitStatus;
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return true;
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}
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}
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else
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return true;
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}
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jint
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java::lang::Win32Process::waitFor (void)
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{
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if (! hasExited ())
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{
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DWORD exitStatus = 0UL;
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// Set up our waitable objects array
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// - 0: the handle to the process we just launched
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// - 1: our thread's interrupt event
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HANDLE arh[2];
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arh[0] = (HANDLE) procHandle;
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arh[1] = _Jv_Win32GetInterruptEvent ();
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DWORD rval = WaitForMultipleObjects (2, arh, 0, INFINITE);
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// Use the returned value from WaitForMultipleObjects
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// instead of our thread's interrupt_flag to test for
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// thread interruption. See the comment for
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// _Jv_Win32GetInterruptEvent().
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bool bInterrupted = rval == (WAIT_OBJECT_0 + 1);
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if (bInterrupted)
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{
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// Querying this forces a reset our thread's interrupt flag.
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Thread::interrupted();
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cleanup ();
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throw new InterruptedException ();
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}
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GetExitCodeProcess ((HANDLE) procHandle, &exitStatus);
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exitCode = exitStatus;
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cleanup ();
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}
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return exitCode;
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}
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// Helper class for creating and managing the pipes
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// used for I/O redirection for child processes.
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class ChildProcessPipe
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{
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public:
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// Indicates from the child process' point of view
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// whether the pipe is for reading or writing.
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enum EType {INPUT, OUTPUT, DUMMY};
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ChildProcessPipe(EType eType);
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~ChildProcessPipe();
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// Returns a pipe handle suitable for use by the parent process
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HANDLE getParentHandle();
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// Returns a pipe handle suitable for use by the child process.
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HANDLE getChildHandle();
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private:
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EType m_eType;
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HANDLE m_hRead, m_hWrite;
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};
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ChildProcessPipe::ChildProcessPipe(EType eType):
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m_eType(eType), m_hRead(0), m_hWrite(0)
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{
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if (eType == DUMMY)
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return;
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SECURITY_ATTRIBUTES sAttrs;
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// Explicitly allow the handles to the pipes to be inherited.
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sAttrs.nLength = sizeof (SECURITY_ATTRIBUTES);
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sAttrs.bInheritHandle = 1;
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sAttrs.lpSecurityDescriptor = NULL;
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if (CreatePipe (&m_hRead, &m_hWrite, &sAttrs, 0) == 0)
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{
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DWORD dwErrorCode = GetLastError ();
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throw new java::io::IOException (
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_Jv_WinStrError (_T("Error creating pipe"), dwErrorCode));
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}
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// If this is the read end of the child, we need
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// to make the parent write end non-inheritable. Similarly,
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// if this is the write end of the child, we need to make
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// the parent read end non-inheritable. If we didn't
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// do this, the child would inherit these ends and we wouldn't
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// be able to close them from our end. For full details,
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// do a Google search on "Q190351".
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HANDLE& rhStd = m_eType==INPUT ? m_hWrite : m_hRead;
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_Jv_platform_close_on_exec (rhStd);
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}
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ChildProcessPipe::~ChildProcessPipe()
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{
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// Close the parent end of the pipe. This
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// destructor is called after the child process
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// has been spawned.
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if (m_eType != DUMMY)
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CloseHandle(getChildHandle());
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}
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HANDLE ChildProcessPipe::getParentHandle()
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{
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return m_eType==INPUT ? m_hWrite : m_hRead;
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}
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HANDLE ChildProcessPipe::getChildHandle()
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{
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return m_eType==INPUT ? m_hRead : m_hWrite;
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}
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void
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java::lang::Win32Process::startProcess (jstringArray progarray,
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jstringArray envp,
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java::io::File *dir,
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jboolean redirect)
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{
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using namespace java::io;
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procHandle = (jint) INVALID_HANDLE_VALUE;
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// Reconstruct the command line.
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jstring *elts = elements (progarray);
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int cmdLineLen = 0;
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for (int i = 0; i < progarray->length; ++i)
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cmdLineLen += (elts[i]->length() + 1);
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LPTSTR cmdLine = (LPTSTR) _Jv_Malloc ((cmdLineLen + 1) * sizeof(TCHAR));
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LPTSTR cmdLineCurPos = cmdLine;
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for (int i = 0; i < progarray->length; ++i)
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{
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if (i > 0)
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*cmdLineCurPos++ = _T(' ');
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jint len = elts[i]->length();
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JV_TEMP_STRING_WIN32(thiselt, elts[i]);
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_tcscpy(cmdLineCurPos, thiselt);
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cmdLineCurPos += len;
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}
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*cmdLineCurPos = _T('\0');
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// Get the environment, if any.
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LPTSTR env = NULL;
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if (envp)
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{
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elts = elements (envp);
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int envLen = 0;
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for (int i = 0; i < envp->length; ++i)
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envLen += (elts[i]->length() + 1);
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env = (LPTSTR) _Jv_Malloc ((envLen + 1) * sizeof(TCHAR));
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int j = 0;
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for (int i = 0; i < envp->length; ++i)
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{
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jint len = elts[i]->length();
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JV_TEMP_STRING_WIN32(thiselt, elts[i]);
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_tcscpy(env + j, thiselt);
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j += len;
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// Skip past the null terminator that _tcscpy just inserted.
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j++;
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}
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*(env + j) = _T('\0');
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}
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// Get the working directory path, if specified.
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JV_TEMP_STRING_WIN32 (wdir, dir ? dir->getPath () : 0);
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errorStream = NULL;
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inputStream = NULL;
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outputStream = NULL;
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java::lang::Throwable *exc = NULL;
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try
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{
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// We create anonymous pipes to communicate with the child
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// on each of standard streams.
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ChildProcessPipe aChildStdIn(ChildProcessPipe::INPUT);
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ChildProcessPipe aChildStdOut(ChildProcessPipe::OUTPUT);
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ChildProcessPipe aChildStdErr(redirect ? ChildProcessPipe::DUMMY
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: ChildProcessPipe::OUTPUT);
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outputStream = new FileOutputStream (new FileChannelImpl (
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(jint) aChildStdIn.getParentHandle (),
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FileChannelImpl::WRITE));
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inputStream = new FileInputStream (new FileChannelImpl (
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(jint) aChildStdOut.getParentHandle (),
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FileChannelImpl::READ));
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if (redirect)
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errorStream = Win32Process$EOFInputStream::instance;
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else
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errorStream = new FileInputStream (new FileChannelImpl (
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(jint) aChildStdErr.getParentHandle (),
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FileChannelImpl::READ));
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// Now create the child process.
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PROCESS_INFORMATION pi;
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STARTUPINFO si;
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ZeroMemory (&pi, sizeof (PROCESS_INFORMATION));
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ZeroMemory (&si, sizeof (STARTUPINFO));
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si.cb = sizeof (STARTUPINFO);
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// Explicitly specify the handles to the standard streams.
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si.dwFlags |= STARTF_USESTDHANDLES;
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si.hStdInput = aChildStdIn.getChildHandle();
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si.hStdOutput = aChildStdOut.getChildHandle();
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si.hStdError = redirect ? aChildStdOut.getChildHandle()
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: aChildStdErr.getChildHandle();
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// Spawn the process. CREATE_NO_WINDOW only applies when
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// starting a console application; it suppresses the
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// creation of a console window. This flag is ignored on
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// Win9X.
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if (CreateProcess (NULL,
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cmdLine,
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NULL,
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NULL,
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1,
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CREATE_NO_WINDOW | CREATE_UNICODE_ENVIRONMENT,
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env,
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wdir,
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&si,
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&pi) == 0)
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{
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DWORD dwErrorCode = GetLastError ();
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throw new IOException (
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_Jv_WinStrError (_T("Error creating child process"), dwErrorCode));
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}
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procHandle = (jint ) pi.hProcess;
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_Jv_Free (cmdLine);
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if (env != NULL)
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_Jv_Free (env);
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}
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catch (java::lang::Throwable *thrown)
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{
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cleanup ();
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exc = thrown;
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}
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if (exc != NULL)
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throw exc;
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}
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