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/*
* Spawning a Win32 child, redirecting its input and outputs
* to standard file descriptors.
*
* Based on code snippets found in misc MSDN articles.
*
* This is the C support routine for Win32Spawn.hs
*/
#include <windows.h>
#include <io.h>
#include <fcntl.h>
#include "spawnProc.h"
/*
* Function: mkAnonPipe
*
* Purpose: create an anonymous pipe with read and write ends being
* optionally (non-)inheritable.
*/
static
BOOL
mkAnonPipe( HANDLE* pHandleIn, BOOL isInheritableIn,
HANDLE* pHandleOut, BOOL isInheritableOut
)
{
HANDLE hTemporaryIn = NULL;
HANDLE hTemporaryOut = NULL;
BOOL status;
SECURITY_ATTRIBUTES sec_attrs;
/* Create inheritable security attributes */
sec_attrs.nLength = sizeof(SECURITY_ATTRIBUTES);
sec_attrs.lpSecurityDescriptor = NULL;
sec_attrs.bInheritHandle = TRUE;
/* Create the anon pipe with both ends inheritable */
status =
CreatePipe( ((!isInheritableIn) ? &hTemporaryIn : pHandleIn),
((!isInheritableOut) ? &hTemporaryOut : pHandleOut),
&sec_attrs,
0);
if ( !status ) {
/* Unable to create the pipe; just give up. */
return FALSE;
}
if (!isInheritableIn) {
/* Make the read end non-inheritable */
status = DuplicateHandle( GetCurrentProcess(), hTemporaryIn,
GetCurrentProcess(), pHandleIn,
0,
FALSE, /* non-inheritable */
DUPLICATE_SAME_ACCESS);
if ( !status ) {
return FALSE;
}
CloseHandle(hTemporaryIn);
}
if (!isInheritableOut) {
/* Make the write end non-inheritable */
status = DuplicateHandle( GetCurrentProcess(), hTemporaryOut,
GetCurrentProcess(), pHandleOut,
0,
FALSE, /* non-inheritable */
DUPLICATE_SAME_ACCESS);
if ( !status ) {
return FALSE;
}
CloseHandle(hTemporaryOut);
}
return TRUE;
}
int
spawnProc ( LPTSTR cmd
, int* pFdInWrite
, int* pFdOutRead
, int* pFdErrRead
)
{
BOOL status;
STARTUPINFO si;
PROCESS_INFORMATION pi;
HANDLE hStdinReadEnd, hStdinWriteEnd;
HANDLE hStdoutReadEnd, hStdoutWriteEnd;
HANDLE hStderrReadEnd, hStderrWriteEnd;
/*
HANDLE hCurrentStdout, hCurrentStderr, hCurrentStdin;
*/
/* Create the stdin anonymous pipe */
if ( !mkAnonPipe( &hStdinReadEnd, TRUE,
&hStdinWriteEnd, FALSE) ) {
/* Unable to create the pipe; just give up. */
return -1;
}
/* Create the stdout anonymous pipe */
if ( !mkAnonPipe( &hStdoutReadEnd, FALSE,
&hStdoutWriteEnd, TRUE) ) {
/* Unable to create the pipe; just give up. */
CloseHandle(hStdinReadEnd);
CloseHandle(hStdinWriteEnd);
return -1;
}
/* Create the stderr anonymous pipe */
if ( !mkAnonPipe( &hStderrReadEnd, FALSE,
&hStderrWriteEnd, TRUE) ) {
/* Unable to create the pipe; just give up. */
CloseHandle(hStdinReadEnd);
CloseHandle(hStdinWriteEnd);
CloseHandle(hStdoutReadEnd);
CloseHandle(hStdoutWriteEnd);
return -1;
}
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
si.hStdInput = hStdinReadEnd;
si.hStdOutput = hStdoutWriteEnd;
si.hStdError = hStderrWriteEnd;
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
/* Passing in the pipe handles via STARTUPINFO is slightly
easier, so let's stick with that for now.
hCurrentStdin = GetStdHandle(STD_INPUT_HANDLE);
hCurrentStdout = GetStdHandle(STD_OUTPUT_HANDLE);
hCurrentStderr = GetStdHandle(STD_ERROR_HANDLE);
SetStdHandle(STD_INPUT_HANDLE, hStdinReadEnd);
SetStdHandle(STD_OUTPUT_HANDLE, hStdoutWriteEnd);
SetStdHandle(STD_ERROR_HANDLE, hStderrWriteEnd);
*/
status = CreateProcess ( NULL,
cmd,
NULL,
NULL,
TRUE, /* inherit handles */
NORMAL_PRIORITY_CLASS,
NULL,
NULL,
&si,
&pi);
/*
SetStdHandle(STD_INPUT_HANDLE, hCurrentStdin);
SetStdHandle(STD_OUTPUT_HANDLE, hCurrentStdout);
SetStdHandle(STD_ERROR_HANDLE, hCurrentStderr);
*/
CloseHandle(hStdinReadEnd);
CloseHandle(hStdoutWriteEnd);
CloseHandle(hStderrWriteEnd);
if (!status) {
CloseHandle(hStdinWriteEnd);
CloseHandle(hStdoutReadEnd);
CloseHandle(hStderrReadEnd);
return -1;
}
/* No need for these, close them. */
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
*pFdInWrite = (int)_open_osfhandle((long)hStdinWriteEnd, _O_TEXT);
*pFdOutRead = (int)_open_osfhandle((long)hStdoutReadEnd, _O_TEXT);
*pFdErrRead = (int)_open_osfhandle((long)hStderrReadEnd, _O_TEXT);
return 0;
}
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