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Copy path_launch.cpp
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142 lines (125 loc) · 4.25 KB
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#include <windows.h>
#include <string.h>
#include <stdio.h>
static BOOL WINAPI
ctrl_c_handler(DWORD code)
{
// just ignore control events
return TRUE;
}
static int
dup_handle(HANDLE input, HANDLE *output)
{
static HANDLE self = NULL;
if (self == NULL) {
self = GetCurrentProcess();
}
if (input == NULL || input == INVALID_HANDLE_VALUE) {
*output = input;
return 0;
}
if (!DuplicateHandle(self, input, self, output, 0, TRUE, DUPLICATE_SAME_ACCESS)) {
if (GetLastError() == ERROR_INVALID_HANDLE) {
*output = NULL;
return 0;
}
return HRESULT_FROM_WIN32(GetLastError());
}
return 0;
}
int
launch(
const wchar_t *executable,
const wchar_t *orig_cmd_line,
const wchar_t *insert_args,
int skip_argc,
DWORD *exit_code
) {
HANDLE job;
JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
DWORD info_len;
STARTUPINFOW si;
PROCESS_INFORMATION pi;
int lastError = 0;
const wchar_t *cmd_line = NULL;
if (orig_cmd_line[0] == L'"') {
cmd_line = wcschr(orig_cmd_line + 1, L'"');
} else {
cmd_line = wcschr(orig_cmd_line, L' ');
}
size_t n = wcslen(executable) + wcslen(orig_cmd_line) + (insert_args ? wcslen(insert_args) : 0) + 6;
wchar_t *new_cmd_line = (wchar_t *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, n * sizeof(wchar_t));
if (!new_cmd_line) {
lastError = GetLastError();
goto exit;
}
// Skip any requested args, deliberately leaving any trailing spaces
// (we'll skip one later on and add our own space, and preserve multiple)
while (cmd_line && *cmd_line && skip_argc-- > 0) {
wchar_t c;
while (*++cmd_line && *cmd_line == L' ') { }
while (*++cmd_line && *cmd_line != L' ') { }
}
swprintf_s(new_cmd_line, n, L"\"%s\"%s%s%s%s",
executable,
(insert_args && *insert_args) ? L" ": L"",
(insert_args && *insert_args) ? insert_args : L"",
(cmd_line && *cmd_line) ? L" " : L"",
(cmd_line && *cmd_line) ? cmd_line + 1 : L"");
job = CreateJobObject(NULL, NULL);
if (!job
|| !QueryInformationJobObject(job, JobObjectExtendedLimitInformation, &info, sizeof(info), &info_len)
|| info_len != sizeof(info)
) {
lastError = GetLastError();
goto exit;
}
info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
if (!SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info, sizeof(info))) {
lastError = GetLastError();
goto exit;
}
memset(&si, 0, sizeof(si));
GetStartupInfoW(&si);
if ((lastError = dup_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput))
|| (lastError = dup_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput))
|| (lastError = dup_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError))
) {
goto exit;
}
if (!SetConsoleCtrlHandler(ctrl_c_handler, TRUE)) {
lastError = GetLastError();
goto exit;
}
si.dwFlags |= STARTF_USESTDHANDLES;
if (!CreateProcessW(executable, new_cmd_line, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi)) {
lastError = GetLastError();
goto exit;
}
AssignProcessToJobObject(job, pi.hProcess);
CloseHandle(pi.hThread);
#if PY_WINDOWED
/*
When explorer launches a Windows (GUI) application, it displays
the "app starting" (the "pointer + hourglass") cursor for a number
of seconds, or until the app does something UI-ish (eg, creating a
window, or fetching a message). As this launcher doesn't do this
directly, that cursor remains even after the child process does these
things. We avoid that by doing a simple post+get message.
See http://bugs.python.org/issue17290
*/
MSG msg;
PostMessage(0, 0, 0, 0);
GetMessage(&msg, 0, 0, 0);
#endif
WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE);
if (!GetExitCodeProcess(pi.hProcess, exit_code)) {
lastError = GetLastError();
}
exit:
if (new_cmd_line) {
HeapFree(GetProcessHeap(), 0, new_cmd_line);
}
return lastError ? HRESULT_FROM_WIN32(lastError) : 0;
}