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/*
* stub16.c
*
* A helper program used for running 16-bit DOS applications under
* Windows 95.
*
* Copyright (c) 1996 by Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: stub16.c,v 1.2 1998/09/14 18:40:19 stanton Exp $
*/
#define STRICT
#include <windows.h>
#include <stdio.h>
static HANDLE CreateTempFile(void);
/*
*---------------------------------------------------------------------------
*
* main
*
* Entry point for the 32-bit console mode app used by Windows 95 to
* help run the 16-bit program specified on the command line.
*
* 1. EOF on a pipe that connects a detached 16-bit process and a
* 32-bit process is never seen. So, this process runs the 16-bit
* process _attached_, and then it is run detached from the calling
* 32-bit process.
*
* 2. If a 16-bit process blocks reading from or writing to a pipe,
* it never wakes up, and eventually brings the whole system down
* with it if you try to kill the process. This app simulates
* pipes. If any of the stdio handles is a pipe, this program
* accumulates information into temp files and forwards it to or
* from the DOS application as appropriate. This means that this
* program must receive EOF from a stdin pipe before it will actually
* start the DOS app, and the DOS app must finish generating stdout
* or stderr before the data will be sent to the next stage of the
* pipe. If the stdio handles are not pipes, no accumulation occurs
* and the data is passed straight through to and from the DOS
* application.
*
* Results:
* None.
*
* Side effects:
* The child process is created and this process waits for it to
* complete.
*
*---------------------------------------------------------------------------
*/
int
main()
{
DWORD dwRead, dwWrite;
char *cmdLine;
HANDLE hStdInput, hStdOutput, hStdError;
HANDLE hFileInput, hFileOutput, hFileError;
STARTUPINFO si;
PROCESS_INFORMATION pi;
char buf[8192];
DWORD result;
hFileInput = INVALID_HANDLE_VALUE;
hFileOutput = INVALID_HANDLE_VALUE;
hFileError = INVALID_HANDLE_VALUE;
result = 1;
/*
* Don't get command line from argc, argv, because the command line
* tokenizer will have stripped off all the escape sequences needed
* for quotes and backslashes, and then we'd have to put them all
* back in again. Get the raw command line and parse off what we
* want ourselves. The command line should be of the form:
*
* stub16.exe program arg1 arg2 ...
*/
cmdLine = strchr(GetCommandLine(), ' ');
if (cmdLine == NULL) {
return 1;
}
cmdLine++;
hStdInput = GetStdHandle(STD_INPUT_HANDLE);
hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
hStdError = GetStdHandle(STD_ERROR_HANDLE);
if (GetFileType(hStdInput) == FILE_TYPE_PIPE) {
hFileInput = CreateTempFile();
if (hFileInput == INVALID_HANDLE_VALUE) {
goto cleanup;
}
while (ReadFile(hStdInput, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
if (dwRead == 0) {
break;
}
if (WriteFile(hFileInput, buf, dwRead, &dwWrite, NULL) == FALSE) {
goto cleanup;
}
}
SetFilePointer(hFileInput, 0, 0, FILE_BEGIN);
SetStdHandle(STD_INPUT_HANDLE, hFileInput);
}
if (GetFileType(hStdOutput) == FILE_TYPE_PIPE) {
hFileOutput = CreateTempFile();
if (hFileOutput == INVALID_HANDLE_VALUE) {
goto cleanup;
}
SetStdHandle(STD_OUTPUT_HANDLE, hFileOutput);
}
if (GetFileType(hStdError) == FILE_TYPE_PIPE) {
hFileError = CreateTempFile();
if (hFileError == INVALID_HANDLE_VALUE) {
goto cleanup;
}
SetStdHandle(STD_ERROR_HANDLE, hFileError);
}
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
if (CreateProcess(NULL, cmdLine, NULL, NULL, TRUE, 0, NULL, NULL, &si,
&pi) == FALSE) {
goto cleanup;
}
WaitForInputIdle(pi.hProcess, 5000);
WaitForSingleObject(pi.hProcess, INFINITE);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
result = 0;
if (hFileOutput != INVALID_HANDLE_VALUE) {
SetFilePointer(hFileOutput, 0, 0, FILE_BEGIN);
while (ReadFile(hFileOutput, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
if (dwRead == 0) {
break;
}
if (WriteFile(hStdOutput, buf, dwRead, &dwWrite, NULL) == FALSE) {
break;
}
}
}
if (hFileError != INVALID_HANDLE_VALUE) {
SetFilePointer(hFileError, 0, 0, FILE_BEGIN);
while (ReadFile(hFileError, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
if (dwRead == 0) {
break;
}
if (WriteFile(hStdError, buf, dwRead, &dwWrite, NULL) == FALSE) {
break;
}
}
}
cleanup:
if (hFileInput != INVALID_HANDLE_VALUE) {
CloseHandle(hFileInput);
}
if (hFileOutput != INVALID_HANDLE_VALUE) {
CloseHandle(hFileOutput);
}
if (hFileError != INVALID_HANDLE_VALUE) {
CloseHandle(hFileError);
}
CloseHandle(hStdInput);
CloseHandle(hStdOutput);
CloseHandle(hStdError);
ExitProcess(result);
return 1;
}
static HANDLE
CreateTempFile()
{
char name[MAX_PATH];
SECURITY_ATTRIBUTES sa;
if (GetTempPath(sizeof(name), name) == 0) {
return INVALID_HANDLE_VALUE;
}
if (GetTempFileName(name, "tcl", 0, name) == 0) {
return INVALID_HANDLE_VALUE;
}
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
return CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0, &sa,
CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE,
NULL);
}
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