cpython/Modules/_multiprocessing/win32_functions.c

/*
 * Win32 functions used by multiprocessing package
 *
 * win32_functions.c
 *
 * Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
 */

#include "multiprocessing.h"


#define WIN32_FUNCTION(func) \
    {#func, (PyCFunction)win32_ ## func, METH_VARARGS | METH_STATIC, ""}

#define WIN32_CONSTANT(fmt, con) \
    PyDict_SetItemString(Win32Type.tp_dict, #con, Py_BuildValue(fmt, con))


static PyObject *
win32_CloseHandle(PyObject *self, PyObject *args)
{
    HANDLE hObject;
    BOOL success;

    if (!PyArg_ParseTuple(args, F_HANDLE, &hObject))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    success = CloseHandle(hObject);
    Py_END_ALLOW_THREADS

    if (!success)
        return PyErr_SetFromWindowsErr(0);

    Py_RETURN_NONE;
}

static PyObject *
win32_ConnectNamedPipe(PyObject *self, PyObject *args)
{
    HANDLE hNamedPipe;
    LPOVERLAPPED lpOverlapped;
    BOOL success;

    if (!PyArg_ParseTuple(args, F_HANDLE F_POINTER,
                          &hNamedPipe, &lpOverlapped))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    success = ConnectNamedPipe(hNamedPipe, lpOverlapped);
    Py_END_ALLOW_THREADS

    if (!success)
        return PyErr_SetFromWindowsErr(0);

    Py_RETURN_NONE;
}

static PyObject *
win32_CreateFile(PyObject *self, PyObject *args)
{
    LPCTSTR lpFileName;
    DWORD dwDesiredAccess;
    DWORD dwShareMode;
    LPSECURITY_ATTRIBUTES lpSecurityAttributes;
    DWORD dwCreationDisposition;
    DWORD dwFlagsAndAttributes;
    HANDLE hTemplateFile;
    HANDLE handle;

    if (!PyArg_ParseTuple(args, "s" F_DWORD F_DWORD F_POINTER
                          F_DWORD F_DWORD F_HANDLE,
                          &lpFileName, &dwDesiredAccess, &dwShareMode,
                          &lpSecurityAttributes, &dwCreationDisposition,
                          &dwFlagsAndAttributes, &hTemplateFile))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    handle = CreateFile(lpFileName, dwDesiredAccess,
                        dwShareMode, lpSecurityAttributes,
                        dwCreationDisposition,
                        dwFlagsAndAttributes, hTemplateFile);
    Py_END_ALLOW_THREADS

    if (handle == INVALID_HANDLE_VALUE)
        return PyErr_SetFromWindowsErr(0);

    return Py_BuildValue(F_HANDLE, handle);
}

static PyObject *
win32_CreateNamedPipe(PyObject *self, PyObject *args)
{
    LPCTSTR lpName;
    DWORD dwOpenMode;
    DWORD dwPipeMode;
    DWORD nMaxInstances;
    DWORD nOutBufferSize;
    DWORD nInBufferSize;
    DWORD nDefaultTimeOut;
    LPSECURITY_ATTRIBUTES lpSecurityAttributes;
    HANDLE handle;

    if (!PyArg_ParseTuple(args, "s" F_DWORD F_DWORD F_DWORD
                          F_DWORD F_DWORD F_DWORD F_POINTER,
                          &lpName, &dwOpenMode, &dwPipeMode,
                          &nMaxInstances, &nOutBufferSize,
                          &nInBufferSize, &nDefaultTimeOut,
                          &lpSecurityAttributes))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    handle = CreateNamedPipe(lpName, dwOpenMode, dwPipeMode,
                             nMaxInstances, nOutBufferSize,
                             nInBufferSize, nDefaultTimeOut,
                             lpSecurityAttributes);
    Py_END_ALLOW_THREADS

    if (handle == INVALID_HANDLE_VALUE)
        return PyErr_SetFromWindowsErr(0);

    return Py_BuildValue(F_HANDLE, handle);
}

static PyObject *
win32_ExitProcess(PyObject *self, PyObject *args)
{
    UINT uExitCode;

    if (!PyArg_ParseTuple(args, "I", &uExitCode))
        return NULL;

    #if defined(Py_DEBUG)
        SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOALIGNMENTFAULTEXCEPT|SEM_NOGPFAULTERRORBOX|SEM_NOOPENFILEERRORBOX);
        _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
    #endif


    ExitProcess(uExitCode);

    return NULL;
}

static PyObject *
win32_GetLastError(PyObject *self, PyObject *args)
{
    return Py_BuildValue(F_DWORD, GetLastError());
}

static PyObject *
win32_OpenProcess(PyObject *self, PyObject *args)
{
    DWORD dwDesiredAccess;
    BOOL bInheritHandle;
    DWORD dwProcessId;
    HANDLE handle;

    if (!PyArg_ParseTuple(args, F_DWORD "i" F_DWORD,
                          &dwDesiredAccess, &bInheritHandle, &dwProcessId))
        return NULL;

    handle = OpenProcess(dwDesiredAccess, bInheritHandle, dwProcessId);
    if (handle == NULL)
        return PyErr_SetFromWindowsErr(0);

    return Py_BuildValue(F_HANDLE, handle);
}

static PyObject *
win32_SetNamedPipeHandleState(PyObject *self, PyObject *args)
{
    HANDLE hNamedPipe;
    PyObject *oArgs[3];
    DWORD dwArgs[3], *pArgs[3] = {NULL, NULL, NULL};
    int i;

    if (!PyArg_ParseTuple(args, F_HANDLE "OOO",
                          &hNamedPipe, &oArgs[0], &oArgs[1], &oArgs[2]))
        return NULL;

    PyErr_Clear();

    for (i = 0 ; i < 3 ; i++) {
        if (oArgs[i] != Py_None) {
            dwArgs[i] = PyLong_AsUnsignedLongMask(oArgs[i]);
            if (PyErr_Occurred())
                return NULL;
            pArgs[i] = &dwArgs[i];
        }
    }

    if (!SetNamedPipeHandleState(hNamedPipe, pArgs[0], pArgs[1], pArgs[2]))
        return PyErr_SetFromWindowsErr(0);

    Py_RETURN_NONE;
}

static PyObject *
win32_WaitNamedPipe(PyObject *self, PyObject *args)
{
    LPCTSTR lpNamedPipeName;
    DWORD nTimeOut;
    BOOL success;

    if (!PyArg_ParseTuple(args, "s" F_DWORD, &lpNamedPipeName, &nTimeOut))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    success = WaitNamedPipe(lpNamedPipeName, nTimeOut);
    Py_END_ALLOW_THREADS

    if (!success)
        return PyErr_SetFromWindowsErr(0);

    Py_RETURN_NONE;
}

static PyObject *
win32_closesocket(PyObject *self, PyObject *args)
{
    HANDLE handle;
    int ret;

    if (!PyArg_ParseTuple(args, F_HANDLE ":closesocket" , &handle))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    ret = closesocket((SOCKET) handle);
    Py_END_ALLOW_THREADS

    if (ret)
        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
    Py_RETURN_NONE;
}

static PyObject *
win32_recv(PyObject *self, PyObject *args)
{
    HANDLE handle;
    int size, nread;
    PyObject *buf;

    if (!PyArg_ParseTuple(args, F_HANDLE "i:recv" , &handle, &size))
        return NULL;

    buf = PyBytes_FromStringAndSize(NULL, size);
    if (!buf)
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    nread = recv((SOCKET) handle, PyBytes_AS_STRING(buf), size, 0);
    Py_END_ALLOW_THREADS

    if (nread < 0) {
        Py_DECREF(buf);
        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
    }
    _PyBytes_Resize(&buf, nread);
    return buf;
}

static PyObject *
win32_send(PyObject *self, PyObject *args)
{
    HANDLE handle;
    Py_buffer buf;
    int ret;

    if (!PyArg_ParseTuple(args, F_HANDLE "y*:send" , &handle, &buf))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    ret = send((SOCKET) handle, buf.buf, buf.len, 0);
    Py_END_ALLOW_THREADS

    PyBuffer_Release(&buf);
    if (ret < 0)
        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
    return PyLong_FromLong(ret);
}

static PyObject *
win32_WriteFile(PyObject *self, PyObject *args)
{
    HANDLE handle;
    Py_buffer buf;
    int written;
    BOOL ret;

    if (!PyArg_ParseTuple(args, F_HANDLE "y*:WriteFile" , &handle, &buf))
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    ret = WriteFile(handle, buf.buf, buf.len, &written, NULL);
    Py_END_ALLOW_THREADS

    PyBuffer_Release(&buf);
    if (!ret)
        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
    return PyLong_FromLong(written);
}

static PyObject *
win32_ReadFile(PyObject *self, PyObject *args)
{
    HANDLE handle;
    int size;
    DWORD nread;
    PyObject *buf;
    BOOL ret;

    if (!PyArg_ParseTuple(args, F_HANDLE "i:ReadFile" , &handle, &size))
        return NULL;

    buf = PyBytes_FromStringAndSize(NULL, size);
    if (!buf)
        return NULL;

    Py_BEGIN_ALLOW_THREADS
    ret = ReadFile(handle, PyBytes_AS_STRING(buf), size, &nread, NULL);
    Py_END_ALLOW_THREADS

    if (!ret && GetLastError() != ERROR_MORE_DATA) {
        Py_DECREF(buf);
        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
    }
    if (_PyBytes_Resize(&buf, nread))
        return NULL;
    return Py_BuildValue("NN", buf, PyBool_FromLong(ret));
}

static PyObject *
win32_PeekNamedPipe(PyObject *self, PyObject *args)
{
    HANDLE handle;
    int size = 0;
    PyObject *buf = NULL;
    DWORD nread, navail, nleft;
    BOOL ret;

    if (!PyArg_ParseTuple(args, F_HANDLE "|i:PeekNamedPipe" , &handle, &size))
        return NULL;

    if (size < 0) {
        PyErr_SetString(PyExc_ValueError, "negative size");
        return NULL;
    }

    if (size) {
        buf = PyBytes_FromStringAndSize(NULL, size);
        if (!buf)
            return NULL;
        Py_BEGIN_ALLOW_THREADS
        ret = PeekNamedPipe(handle, PyBytes_AS_STRING(buf), size, &nread,
                            &navail, &nleft);
        Py_END_ALLOW_THREADS
        if (!ret) {
            Py_DECREF(buf);
            return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
        }
        if (_PyBytes_Resize(&buf, nread))
            return NULL;
        return Py_BuildValue("Nii", buf, navail, nleft);
    }
    else {
        Py_BEGIN_ALLOW_THREADS
        ret = PeekNamedPipe(handle, NULL, 0, NULL, &navail, &nleft);
        Py_END_ALLOW_THREADS
        if (!ret) {
            return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
        }
        return Py_BuildValue("ii", navail, nleft);
    }
}

static PyMethodDef win32_methods[] = {
    WIN32_FUNCTION(CloseHandle),
    WIN32_FUNCTION(GetLastError),
    WIN32_FUNCTION(OpenProcess),
    WIN32_FUNCTION(ExitProcess),
    WIN32_FUNCTION(ConnectNamedPipe),
    WIN32_FUNCTION(CreateFile),
    WIN32_FUNCTION(CreateNamedPipe),
    WIN32_FUNCTION(ReadFile),
    WIN32_FUNCTION(PeekNamedPipe),
    WIN32_FUNCTION(SetNamedPipeHandleState),
    WIN32_FUNCTION(WaitNamedPipe),
    WIN32_FUNCTION(WriteFile),
    WIN32_FUNCTION(closesocket),
    WIN32_FUNCTION(recv),
    WIN32_FUNCTION(send),
    {NULL}
};


PyTypeObject Win32Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
};


PyObject *
create_win32_namespace(void)
{
    Win32Type.tp_name = "_multiprocessing.win32";
    Win32Type.tp_methods = win32_methods;
    if (PyType_Ready(&Win32Type) < 0)
        return NULL;
    Py_INCREF(&Win32Type);

    WIN32_CONSTANT(F_DWORD, ERROR_ALREADY_EXISTS);
    WIN32_CONSTANT(F_DWORD, ERROR_BROKEN_PIPE);
    WIN32_CONSTANT(F_DWORD, ERROR_NO_SYSTEM_RESOURCES);
    WIN32_CONSTANT(F_DWORD, ERROR_PIPE_BUSY);
    WIN32_CONSTANT(F_DWORD, ERROR_PIPE_CONNECTED);
    WIN32_CONSTANT(F_DWORD, ERROR_SEM_TIMEOUT);
    WIN32_CONSTANT(F_DWORD, GENERIC_READ);
    WIN32_CONSTANT(F_DWORD, GENERIC_WRITE);
    WIN32_CONSTANT(F_DWORD, INFINITE);
    WIN32_CONSTANT(F_DWORD, NMPWAIT_WAIT_FOREVER);
    WIN32_CONSTANT(F_DWORD, OPEN_EXISTING);
    WIN32_CONSTANT(F_DWORD, PIPE_ACCESS_DUPLEX);
    WIN32_CONSTANT(F_DWORD, PIPE_ACCESS_INBOUND);
    WIN32_CONSTANT(F_DWORD, PIPE_READMODE_MESSAGE);
    WIN32_CONSTANT(F_DWORD, PIPE_TYPE_MESSAGE);
    WIN32_CONSTANT(F_DWORD, PIPE_UNLIMITED_INSTANCES);
    WIN32_CONSTANT(F_DWORD, PIPE_WAIT);
    WIN32_CONSTANT(F_DWORD, PROCESS_ALL_ACCESS);

    WIN32_CONSTANT("i", NULL);

    return (PyObject*)&Win32Type;
}