"process_easy: DuplicateHandle(In) failed" is issued, when redirecting the mingw32-make output from a parent process.
GetStdHandle returns 0, which is not an error, but also no handle to be duplicated.
Example parent process code leading to error (in C#):
static StringBuilder myOutput=null;
private static void MyOutputDataHandler(object sendingProcess,
DataReceivedEventArgs line)
{
if (!String.IsNullOrEmpty(line.Data))
{
myOutput.Append(Environment.NewLine + "out: " + line.Data);
}
}
private static void MyErrorDataHandler(object sendingProcess,
DataReceivedEventArgs line)
{
if (!String.IsNullOrEmpty(line.Data))
{
myOutput.Append(Environment.NewLine + "err: " + line.Data);
}
}
private void button1_Click(object sender, EventArgs e)
{
Process myprocess = new Process();
myprocess.StartInfo.FileName = "mingw32-make.exe";
myprocess.StartInfo.Arguments = "-f C:/test/main.mak";
myprocess.StartInfo.UseShellExecute = false;
myprocess.StartInfo.RedirectStandardOutput = true;
myprocess.OutputDataReceived += new DataReceivedEventHandler(MyOutputDataHandler);
myprocess.StartInfo.RedirectStandardError = true;
myprocess.ErrorDataReceived += new DataReceivedEventHandler(MyErrorDataHandler);
myOutput = new StringBuilder();
myprocess.Start();
myprocess.BeginOutputReadLine();
myprocess.BeginErrorReadLine();
myprocess.WaitForExit();
if (myOutput.Length > 0)
{
System.Windows.Forms.MessageBox.Show(myOutput.ToString(), "Hello");
}
myprocess.Close();
}
Patch that helped:
HANDLE
process_easy(
char **argv,
char **envp)
{
HANDLE hIn=0;
HANDLE hOut=0;
HANDLE hErr=0;
HANDLE hProcess;
HANDLE processPseudo;
HANDLE tmpIn,tmpOut,tmpErr;
processPseudo=GetCurrentProcess();
tmpIn=GetStdHandle(STD_INPUT_HANDLE);
tmpOut=GetStdHandle(STD_OUTPUT_HANDLE);
tmpErr=GetStdHandle(STD_ERROR_HANDLE);
fprintf(stdout, "Handles: %d,%d,%d\n",tmpIn,tmpOut,tmpErr);
if (tmpIn && DuplicateHandle(processPseudo,
tmpIn,
processPseudo,
&hIn,
0,
TRUE,
DUPLICATE_SAME_ACCESS) == FALSE) {
fprintf(stderr,
"process_easy: DuplicateHandle(In) failed (e=%d)\n",
GetLastError());
return INVALID_HANDLE_VALUE;
}
if (tmpOut && DuplicateHandle(processPseudo,
tmpOut,
processPseudo,
&hOut,
0,
TRUE,
DUPLICATE_SAME_ACCESS) == FALSE) {
fprintf(stderr,
"process_easy: DuplicateHandle(Out) failed (e=%d)\n",
GetLastError());
return INVALID_HANDLE_VALUE;
}
if (tmpErr && DuplicateHandle(processPseudo,
tmpErr,
processPseudo,
&hErr,
0,
TRUE,
DUPLICATE_SAME_ACCESS) == FALSE) {
fprintf(stderr,
"process_easy: DuplicateHandle(Err) failed (e=%d)\n",
GetLastError());
return INVALID_HANDLE_VALUE;
}
hProcess = process_init_fd(hIn, hOut, hErr);
if (process_begin(hProcess, argv, envp, argv[0], NULL)) {
fake_exits_pending++;
((sub_process*) hProcess)->exit_code = process_last_err(hProcess);
/* close up unused handles */
CloseHandle(hIn);
CloseHandle(hOut);
CloseHandle(hErr);
}
process_register(hProcess);
return hProcess;
}
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