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cpython/PC/_subprocess.c

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/*
* support routines for subprocess module
*
* Currently, this extension module is only required when using the
* subprocess module on Windows, but in the future, stubs for other
* platforms might be added here as well.
*
* Copyright (c) 2004 by Fredrik Lundh <fredrik@pythonware.com>
* Copyright (c) 2004 by Secret Labs AB, http://www.pythonware.com
* Copyright (c) 2004 by Peter Astrand <astrand@lysator.liu.se>
*
* By obtaining, using, and/or copying this software and/or its
* associated documentation, you agree that you have read, understood,
* and will comply with the following terms and conditions:
*
* Permission to use, copy, modify, and distribute this software and
* its associated documentation for any purpose and without fee is
* hereby granted, provided that the above copyright notice appears in
* all copies, and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of the
* authors not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission.
*
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* Licensed to PSF under a Contributor Agreement. */
/* See http://www.python.org/2.4/license for licensing details. */
#include "Python.h"
#define WINDOWS_LEAN_AND_MEAN
#include "windows.h"
/* -------------------------------------------------------------------- */
/* handle wrapper. note that this library uses integers when passing
handles to a function, and handle wrappers when returning handles.
the wrapper is used to provide Detach and Close methods */
typedef struct {
PyObject_HEAD
HANDLE handle;
} sp_handle_object;
static PyTypeObject sp_handle_type;
static PyObject*
sp_handle_new(HANDLE handle)
{
sp_handle_object* self;
self = PyObject_NEW(sp_handle_object, &sp_handle_type);
if (self == NULL)
return NULL;
self->handle = handle;
return (PyObject*) self;
}
#if defined(MS_WIN32) && !defined(MS_WIN64)
#define HANDLE_TO_PYNUM(handle) PyLong_FromLong((long) handle)
#define PY_HANDLE_PARAM "l"
#else
#define HANDLE_TO_PYNUM(handle) PyLong_FromLongLong((long long) handle)
#define PY_HANDLE_PARAM "L"
#endif
static PyObject*
sp_handle_detach(sp_handle_object* self, PyObject* args)
{
HANDLE handle;
if (! PyArg_ParseTuple(args, ":Detach"))
return NULL;
handle = self->handle;
self->handle = INVALID_HANDLE_VALUE;
/* note: return the current handle, as an integer */
return HANDLE_TO_PYNUM(handle);
}
static PyObject*
sp_handle_close(sp_handle_object* self, PyObject* args)
{
if (! PyArg_ParseTuple(args, ":Close"))
return NULL;
if (self->handle != INVALID_HANDLE_VALUE) {
CloseHandle(self->handle);
self->handle = INVALID_HANDLE_VALUE;
}
Py_INCREF(Py_None);
return Py_None;
}
static void
sp_handle_dealloc(sp_handle_object* self)
{
if (self->handle != INVALID_HANDLE_VALUE)
CloseHandle(self->handle);
PyObject_FREE(self);
}
static PyMethodDef sp_handle_methods[] = {
{"Detach", (PyCFunction) sp_handle_detach, METH_VARARGS},
{"Close", (PyCFunction) sp_handle_close, METH_VARARGS},
{NULL, NULL}
};
static PyObject*
sp_handle_as_int(sp_handle_object* self)
{
return HANDLE_TO_PYNUM(self->handle);
}
static PyNumberMethods sp_handle_as_number;
static PyTypeObject sp_handle_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_subprocess_handle", sizeof(sp_handle_object), 0,
(destructor) sp_handle_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
&sp_handle_as_number, /*tp_as_number */
0, /*tp_as_sequence */
0, /*tp_as_mapping */
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
sp_handle_methods, /*tp_methods*/
};
/* -------------------------------------------------------------------- */
/* windows API functions */
PyDoc_STRVAR(GetStdHandle_doc,
"GetStdHandle(handle) -> integer\n\
\n\
Return a handle to the specified standard device\n\
(STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, STD_ERROR_HANDLE).\n\
The integer associated with the handle object is returned.");
static PyObject *
sp_GetStdHandle(PyObject* self, PyObject* args)
{
HANDLE handle;
int std_handle;
if (! PyArg_ParseTuple(args, "i:GetStdHandle", &std_handle))
return NULL;
Py_BEGIN_ALLOW_THREADS
handle = GetStdHandle((DWORD) std_handle);
Py_END_ALLOW_THREADS
if (handle == INVALID_HANDLE_VALUE)
return PyErr_SetFromWindowsErr(GetLastError());
if (! handle) {
Py_INCREF(Py_None);
return Py_None;
}
/* note: returns integer, not handle object */
return HANDLE_TO_PYNUM(handle);
}
PyDoc_STRVAR(GetCurrentProcess_doc,
"GetCurrentProcess() -> handle\n\
\n\
Return a handle object for the current process.");
static PyObject *
sp_GetCurrentProcess(PyObject* self, PyObject* args)
{
if (! PyArg_ParseTuple(args, ":GetCurrentProcess"))
return NULL;
return sp_handle_new(GetCurrentProcess());
}
PyDoc_STRVAR(DuplicateHandle_doc,
"DuplicateHandle(source_proc_handle, source_handle,\n\
target_proc_handle, target_handle, access,\n\
inherit[, options]) -> handle\n\
\n\
Return a duplicate handle object.\n\
\n\
The duplicate handle refers to the same object as the original\n\
handle. Therefore, any changes to the object are reflected\n\
through both handles.");
static PyObject *
sp_DuplicateHandle(PyObject* self, PyObject* args)
{
HANDLE target_handle;
BOOL result;
HANDLE source_process_handle;
HANDLE source_handle;
HANDLE target_process_handle;
int desired_access;
int inherit_handle;
int options = 0;
if (! PyArg_ParseTuple(args,
PY_HANDLE_PARAM PY_HANDLE_PARAM PY_HANDLE_PARAM
"ii|i:DuplicateHandle",
&source_process_handle,
&source_handle,
&target_process_handle,
&desired_access,
&inherit_handle,
&options))
return NULL;
Py_BEGIN_ALLOW_THREADS
result = DuplicateHandle(
source_process_handle,
source_handle,
target_process_handle,
&target_handle,
desired_access,
inherit_handle,
options
);
Py_END_ALLOW_THREADS
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
return sp_handle_new(target_handle);
}
PyDoc_STRVAR(CreatePipe_doc,
"CreatePipe(pipe_attrs, size) -> (read_handle, write_handle)\n\
\n\
Create an anonymous pipe, and return handles to the read and\n\
write ends of the pipe.\n\
\n\
pipe_attrs is ignored internally and can be None.");
static PyObject *
sp_CreatePipe(PyObject* self, PyObject* args)
{
HANDLE read_pipe;
HANDLE write_pipe;
BOOL result;
PyObject* pipe_attributes; /* ignored */
int size;
if (! PyArg_ParseTuple(args, "Oi:CreatePipe", &pipe_attributes, &size))
return NULL;
Py_BEGIN_ALLOW_THREADS
result = CreatePipe(&read_pipe, &write_pipe, NULL, size);
Py_END_ALLOW_THREADS
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
return Py_BuildValue(
"NN", sp_handle_new(read_pipe), sp_handle_new(write_pipe));
}
/* helpers for createprocess */
static int
getint(PyObject* obj, char* name)
{
PyObject* value;
int ret;
value = PyObject_GetAttrString(obj, name);
if (! value) {
PyErr_Clear(); /* FIXME: propagate error? */
return 0;
}
ret = (int) PyLong_AsLong(value);
Py_DECREF(value);
return ret;
}
static HANDLE
gethandle(PyObject* obj, char* name)
{
sp_handle_object* value;
HANDLE ret;
value = (sp_handle_object*) PyObject_GetAttrString(obj, name);
if (! value) {
PyErr_Clear(); /* FIXME: propagate error? */
return NULL;
}
if (Py_TYPE(value) != &sp_handle_type)
ret = NULL;
else
ret = value->handle;
Py_DECREF(value);
return ret;
}
static PyObject*
getenvironment(PyObject* environment)
{
int i;
Py_ssize_t envsize;
PyObject* out = NULL;
PyObject* keys;
PyObject* values;
Py_UNICODE* p;
/* convert environment dictionary to windows enviroment string */
if (! PyMapping_Check(environment)) {
PyErr_SetString(
PyExc_TypeError, "environment must be dictionary or None");
return NULL;
}
envsize = PyMapping_Length(environment);
keys = PyMapping_Keys(environment);
values = PyMapping_Values(environment);
if (!keys || !values)
goto error;
out = PyUnicode_FromUnicode(NULL, 2048);
if (! out)
goto error;
p = PyUnicode_AS_UNICODE(out);
for (i = 0; i < envsize; i++) {
Py_ssize_t ksize, vsize, totalsize;
PyObject* key = PyList_GET_ITEM(keys, i);
PyObject* value = PyList_GET_ITEM(values, i);
if (! PyUnicode_Check(key) || ! PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"environment can only contain strings");
goto error;
}
ksize = PyUnicode_GET_SIZE(key);
vsize = PyUnicode_GET_SIZE(value);
totalsize = (p - PyUnicode_AS_UNICODE(out)) + ksize + 1 +
vsize + 1 + 1;
if (totalsize > PyUnicode_GET_SIZE(out)) {
Py_ssize_t offset = p - PyUnicode_AS_UNICODE(out);
PyUnicode_Resize(&out, totalsize + 1024);
p = PyUnicode_AS_UNICODE(out) + offset;
}
Py_UNICODE_COPY(p, PyUnicode_AS_UNICODE(key), ksize);
p += ksize;
*p++ = '=';
Py_UNICODE_COPY(p, PyUnicode_AS_UNICODE(value), vsize);
p += vsize;
*p++ = '\0';
}
/* add trailing null byte */
*p++ = '\0';
PyUnicode_Resize(&out, p - PyUnicode_AS_UNICODE(out));
/* PyObject_Print(out, stdout, 0); */
Py_XDECREF(keys);
Py_XDECREF(values);
return out;
error:
Py_XDECREF(out);
Py_XDECREF(keys);
Py_XDECREF(values);
return NULL;
}
PyDoc_STRVAR(CreateProcess_doc,
"CreateProcess(app_name, cmd_line, proc_attrs, thread_attrs,\n\
inherit, flags, env_mapping, curdir,\n\
startup_info) -> (proc_handle, thread_handle,\n\
pid, tid)\n\
\n\
Create a new process and its primary thread. The return\n\
value is a tuple of the process handle, thread handle,\n\
process ID, and thread ID.\n\
\n\
proc_attrs and thread_attrs are ignored internally and can be None.");
static PyObject *
sp_CreateProcess(PyObject* self, PyObject* args)
{
BOOL result;
PROCESS_INFORMATION pi;
STARTUPINFOW si;
PyObject* environment;
Py_UNICODE* application_name;
Py_UNICODE* command_line;
PyObject* process_attributes; /* ignored */
PyObject* thread_attributes; /* ignored */
int inherit_handles;
int creation_flags;
PyObject* env_mapping;
Py_UNICODE* current_directory;
PyObject* startup_info;
if (! PyArg_ParseTuple(args, "ZZOOiiOZO:CreateProcess",
&application_name,
&command_line,
&process_attributes,
&thread_attributes,
&inherit_handles,
&creation_flags,
&env_mapping,
&current_directory,
&startup_info))
return NULL;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
/* note: we only support a small subset of all SI attributes */
si.dwFlags = getint(startup_info, "dwFlags");
si.wShowWindow = getint(startup_info, "wShowWindow");
si.hStdInput = gethandle(startup_info, "hStdInput");
si.hStdOutput = gethandle(startup_info, "hStdOutput");
si.hStdError = gethandle(startup_info, "hStdError");
if (PyErr_Occurred())
return NULL;
if (env_mapping == Py_None)
environment = NULL;
else {
environment = getenvironment(env_mapping);
if (! environment)
return NULL;
}
Py_BEGIN_ALLOW_THREADS
result = CreateProcessW(application_name,
command_line,
NULL,
NULL,
inherit_handles,
creation_flags | CREATE_UNICODE_ENVIRONMENT,
environment ? PyUnicode_AS_UNICODE(environment) : NULL,
current_directory,
&si,
&pi);
Py_END_ALLOW_THREADS
Py_XDECREF(environment);
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
return Py_BuildValue("NNii",
sp_handle_new(pi.hProcess),
sp_handle_new(pi.hThread),
pi.dwProcessId,
pi.dwThreadId);
}
PyDoc_STRVAR(TerminateProcess_doc,
"TerminateProcess(handle, exit_code) -> None\n\
\n\
Terminate the specified process and all of its threads.");
static PyObject *
sp_TerminateProcess(PyObject* self, PyObject* args)
{
BOOL result;
HANDLE process;
int exit_code;
if (! PyArg_ParseTuple(args, PY_HANDLE_PARAM "i:TerminateProcess",
&process, &exit_code))
return NULL;
result = TerminateProcess(process, exit_code);
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(GetExitCodeProcess_doc,
"GetExitCodeProcess(handle) -> Exit code\n\
\n\
Return the termination status of the specified process.");
static PyObject *
sp_GetExitCodeProcess(PyObject* self, PyObject* args)
{
DWORD exit_code;
BOOL result;
HANDLE process;
if (! PyArg_ParseTuple(args, PY_HANDLE_PARAM ":GetExitCodeProcess", &process))
return NULL;
result = GetExitCodeProcess(process, &exit_code);
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
return PyLong_FromLong(exit_code);
}
PyDoc_STRVAR(WaitForSingleObject_doc,
"WaitForSingleObject(handle, timeout) -> result\n\
\n\
Wait until the specified object is in the signaled state or\n\
the time-out interval elapses. The timeout value is specified\n\
in milliseconds.");
static PyObject *
sp_WaitForSingleObject(PyObject* self, PyObject* args)
{
DWORD result;
HANDLE handle;
int milliseconds;
if (! PyArg_ParseTuple(args, PY_HANDLE_PARAM "i:WaitForSingleObject",
&handle,
&milliseconds))
return NULL;
Py_BEGIN_ALLOW_THREADS
result = WaitForSingleObject(handle, (DWORD) milliseconds);
Py_END_ALLOW_THREADS
if (result == WAIT_FAILED)
return PyErr_SetFromWindowsErr(GetLastError());
return PyLong_FromLong((int) result);
}
PyDoc_STRVAR(GetVersion_doc,
"GetVersion() -> version\n\
\n\
Return the version number of the current operating system.");
static PyObject *
sp_GetVersion(PyObject* self, PyObject* args)
{
if (! PyArg_ParseTuple(args, ":GetVersion"))
return NULL;
return PyLong_FromLong((int) GetVersion());
}
PyDoc_STRVAR(GetModuleFileName_doc,
"GetModuleFileName(module) -> path\n\
\n\
Return the fully-qualified path for the file that contains\n\
the specified module. The module must have been loaded by the\n\
current process.\n\
\n\
The module parameter should be a handle to the loaded module\n\
whose path is being requested. If this parameter is 0, \n\
GetModuleFileName retrieves the path of the executable file\n\
of the current process.");
static PyObject *
sp_GetModuleFileName(PyObject* self, PyObject* args)
{
BOOL result;
HMODULE module;
WCHAR filename[MAX_PATH];
if (! PyArg_ParseTuple(args, PY_HANDLE_PARAM ":GetModuleFileName",
&module))
return NULL;
result = GetModuleFileNameW(module, filename, MAX_PATH);
filename[MAX_PATH-1] = '\0';
if (! result)
return PyErr_SetFromWindowsErr(GetLastError());
return PyUnicode_FromUnicode(filename, Py_UNICODE_strlen(filename));
}
static PyMethodDef sp_functions[] = {
{"GetStdHandle", sp_GetStdHandle, METH_VARARGS, GetStdHandle_doc},
{"GetCurrentProcess", sp_GetCurrentProcess, METH_VARARGS,
GetCurrentProcess_doc},
{"DuplicateHandle", sp_DuplicateHandle, METH_VARARGS,
DuplicateHandle_doc},
{"CreatePipe", sp_CreatePipe, METH_VARARGS, CreatePipe_doc},
{"CreateProcess", sp_CreateProcess, METH_VARARGS, CreateProcess_doc},
{"TerminateProcess", sp_TerminateProcess, METH_VARARGS,
TerminateProcess_doc},
{"GetExitCodeProcess", sp_GetExitCodeProcess, METH_VARARGS,
GetExitCodeProcess_doc},
{"WaitForSingleObject", sp_WaitForSingleObject, METH_VARARGS,
WaitForSingleObject_doc},
{"GetVersion", sp_GetVersion, METH_VARARGS, GetVersion_doc},
{"GetModuleFileName", sp_GetModuleFileName, METH_VARARGS,
GetModuleFileName_doc},
{NULL, NULL}
};
/* -------------------------------------------------------------------- */
static void
defint(PyObject* d, const char* name, int value)
{
PyObject* v = PyLong_FromLong((long) value);
if (v) {
PyDict_SetItemString(d, (char*) name, v);
Py_DECREF(v);
}
}
static struct PyModuleDef _subprocessmodule = {
PyModuleDef_HEAD_INIT,
"_subprocess",
NULL,
-1,
sp_functions,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__subprocess()
{
PyObject *d;
PyObject *m;
/* patch up object descriptors */
sp_handle_as_number.nb_int = (unaryfunc) sp_handle_as_int;
if (PyType_Ready(&sp_handle_type) < 0)
return NULL;
m = PyModule_Create(&_subprocessmodule);
if (m == NULL)
return NULL;
d = PyModule_GetDict(m);
/* constants */
defint(d, "STD_INPUT_HANDLE", STD_INPUT_HANDLE);
defint(d, "STD_OUTPUT_HANDLE", STD_OUTPUT_HANDLE);
defint(d, "STD_ERROR_HANDLE", STD_ERROR_HANDLE);
defint(d, "DUPLICATE_SAME_ACCESS", DUPLICATE_SAME_ACCESS);
defint(d, "STARTF_USESTDHANDLES", STARTF_USESTDHANDLES);
defint(d, "STARTF_USESHOWWINDOW", STARTF_USESHOWWINDOW);
defint(d, "SW_HIDE", SW_HIDE);
defint(d, "INFINITE", INFINITE);
defint(d, "WAIT_OBJECT_0", WAIT_OBJECT_0);
defint(d, "CREATE_NEW_CONSOLE", CREATE_NEW_CONSOLE);
defint(d, "CREATE_NEW_PROCESS_GROUP", CREATE_NEW_PROCESS_GROUP);
defint(d, "STILL_ACTIVE", STILL_ACTIVE);
return m;
}
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