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/*=========================================================================
Program: KWSys - Kitware System Library
Module: $RCSfile$
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
See http://www.cmake.org/HTML/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
/*
On Windows9x platforms, this executable is spawned between a parent
process and the child it is invoking to work around a bug. See the
Win32 implementation file for details.
*/
#include <windows.h>
#include <stdio.h>
int main()
{
/* Process startup information for the real child. */
STARTUPINFO si;
PROCESS_INFORMATION pi;
/* The result of waiting for the child to exit. */
DWORD waitResult;
/* The child's process return code. */
DWORD retVal;
/* The command line used to invoke this process. */
LPSTR commandLine = GetCommandLine();
/* Pointer that will be advanced to the beginning of the command
line of the real child process. */
LPSTR cmdLine = commandLine;
/* Handle to the error reporting pipe provided by the parent. This
is parsed off the command line. */
HANDLE errorPipe = 0;
/* Handle to the event the parent uses to tell us to kill the child.
This is parsed off the command line. */
HANDLE killEvent = 0;
/* An array of the handles on which we wait when the child is
running. */
HANDLE waitHandles[2] = {0, 0};
/* Move the pointer past the name of this executable. */
if(*cmdLine == '"')
{
++cmdLine;
while(*cmdLine && *cmdLine != '"') { ++cmdLine; }
if(*cmdLine) { ++cmdLine; }
}
else
{
while(*cmdLine && *cmdLine != ' ') { ++cmdLine; }
}
/* Parse the error pipe handle. */
while(*cmdLine && *cmdLine == ' ') { ++cmdLine; }
sscanf(cmdLine, "%d", &errorPipe);
/* Parse the kill event handle. */
while(*cmdLine && *cmdLine != ' ') { ++cmdLine; }
while(*cmdLine && *cmdLine == ' ') { ++cmdLine; }
sscanf(cmdLine, "%d", &killEvent);
/* Skip to the beginning of the command line of the real child. */
while(*cmdLine && *cmdLine != ' ') { ++cmdLine; }
while(*cmdLine && *cmdLine == ' ') { ++cmdLine; }
/* Create the subprocess. */
ZeroMemory(&si, sizeof(si));
ZeroMemory(&pi, sizeof(pi));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
si.wShowWindow = SW_SHOWDEFAULT;
si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
if(!CreateProcess(0, cmdLine, 0, 0, TRUE, 0, 0, 0, &si, &pi))
{
/* Error creating the process. Report the error to the parent
process through the special error reporting pipe. */
LPVOID lpMsgBuf;
DWORD n;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
WriteFile(errorPipe, lpMsgBuf, strlen(lpMsgBuf)+1, &n, 0);
LocalFree( lpMsgBuf );
return 1;
}
CloseHandle(pi.hThread);
/* Wait for subprocess to exit or for kill event from parent. */
waitHandles[0] = killEvent;
waitHandles[1] = pi.hProcess;
waitResult = WaitForMultipleObjects(2, waitHandles, 0, INFINITE);
/* Check what happened. */
if(waitResult == WAIT_OBJECT_0)
{
/* We were asked to kill the child. */
TerminateProcess(pi.hProcess, -1);
WaitForSingleObject(pi.hProcess, INFINITE);
CloseHandle(pi.hProcess);
return 1;
}
else if(GetExitCodeProcess(pi.hProcess, &retVal))
{
/* The child exited and we could get the return code. */
CloseHandle(pi.hProcess);
return retVal;
}
else
{
/* The child exited and we could not get the return code. Report
the problem to the parent process. */
DWORD n;
const char* msg = "Failed to get process return code.";
WriteFile(errorPipe, msg, strlen(msg)+1, &n, 0);
CloseHandle(pi.hProcess);
return -1;
}
}
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