mirror of
https://github.com/python/cpython.git
synced 2024-12-11 18:53:56 +08:00
98297ee781
No detailed change log; just check out the change log for the py3k-pep3137 branch. The most obvious changes: - str8 renamed to bytes (PyString at the C level); - bytes renamed to buffer (PyBytes at the C level); - PyString and PyUnicode are no longer compatible. I.e. we now have an immutable bytes type and a mutable bytes type. The behavior of PyString was modified quite a bit, to make it more bytes-like. Some changes are still on the to-do list.
1301 lines
31 KiB
C
1301 lines
31 KiB
C
/*
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/ Author: Sam Rushing <rushing@nightmare.com>
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/ Hacked for Unix by AMK
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/ $Id$
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/ Modified to support mmap with offset - to map a 'window' of a file
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/ Author: Yotam Medini yotamm@mellanox.co.il
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/
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/ mmapmodule.cpp -- map a view of a file into memory
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/
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/ todo: need permission flags, perhaps a 'chsize' analog
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/ not all functions check range yet!!!
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/
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/
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/ This version of mmapmodule.c has been changed significantly
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/ from the original mmapfile.c on which it was based.
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/ The original version of mmapfile is maintained by Sam at
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/ ftp://squirl.nightmare.com/pub/python/python-ext.
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*/
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#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#ifndef MS_WINDOWS
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#define UNIX
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#endif
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#ifdef MS_WINDOWS
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#include <windows.h>
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static int
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my_getpagesize(void)
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwPageSize;
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}
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static int
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my_getallocationgranularity (void)
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwAllocationGranularity;
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}
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#endif
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#ifdef UNIX
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#include <sys/mman.h>
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#include <sys/stat.h>
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#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
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static int
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my_getpagesize(void)
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{
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return sysconf(_SC_PAGESIZE);
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}
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#define my_getallocationgranularity my_getpagesize
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#else
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#define my_getpagesize getpagesize
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#endif
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#endif /* UNIX */
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif /* HAVE_SYS_TYPES_H */
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/* Prefer MAP_ANONYMOUS since MAP_ANON is deprecated according to man page. */
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#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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# define MAP_ANONYMOUS MAP_ANON
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#endif
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static PyObject *mmap_module_error;
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typedef enum
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{
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ACCESS_DEFAULT,
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ACCESS_READ,
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ACCESS_WRITE,
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ACCESS_COPY
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} access_mode;
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typedef struct {
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PyObject_HEAD
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char * data;
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size_t size;
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size_t pos; /* relative to offset */
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size_t offset;
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int exports;
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#ifdef MS_WINDOWS
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HANDLE map_handle;
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HANDLE file_handle;
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char * tagname;
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#endif
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#ifdef UNIX
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int fd;
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#endif
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access_mode access;
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} mmap_object;
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static void
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mmap_object_dealloc(mmap_object *m_obj)
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{
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#ifdef MS_WINDOWS
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if (m_obj->data != NULL)
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UnmapViewOfFile (m_obj->data);
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if (m_obj->map_handle != INVALID_HANDLE_VALUE)
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CloseHandle (m_obj->map_handle);
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if (m_obj->file_handle != INVALID_HANDLE_VALUE)
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CloseHandle (m_obj->file_handle);
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if (m_obj->tagname)
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PyMem_Free(m_obj->tagname);
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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if (m_obj->fd >= 0)
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(void) close(m_obj->fd);
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if (m_obj->data!=NULL) {
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msync(m_obj->data, m_obj->size, MS_SYNC);
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munmap(m_obj->data, m_obj->size);
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}
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#endif /* UNIX */
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PyObject_Del(m_obj);
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}
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static PyObject *
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mmap_close_method(mmap_object *self, PyObject *unused)
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{
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if (self->exports > 0) {
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PyErr_SetString(PyExc_BufferError, "cannot close "\
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"exported pointers exist");
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return NULL;
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}
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#ifdef MS_WINDOWS
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/* For each resource we maintain, we need to check
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the value is valid, and if so, free the resource
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and set the member value to an invalid value so
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the dealloc does not attempt to resource clearing
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again.
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TODO - should we check for errors in the close operations???
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*/
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if (self->data != NULL) {
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UnmapViewOfFile(self->data);
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self->data = NULL;
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}
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if (self->map_handle != INVALID_HANDLE_VALUE) {
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CloseHandle(self->map_handle);
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self->map_handle = INVALID_HANDLE_VALUE;
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}
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if (self->file_handle != INVALID_HANDLE_VALUE) {
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CloseHandle(self->file_handle);
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self->file_handle = INVALID_HANDLE_VALUE;
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}
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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(void) close(self->fd);
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self->fd = -1;
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if (self->data != NULL) {
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munmap(self->data, self->size);
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self->data = NULL;
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}
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#endif
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Py_INCREF(Py_None);
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return Py_None;
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}
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#ifdef MS_WINDOWS
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#define CHECK_VALID(err) \
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do { \
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if (self->map_handle == INVALID_HANDLE_VALUE) { \
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PyErr_SetString(PyExc_ValueError, "mmap closed or invalid"); \
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return err; \
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} \
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} while (0)
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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#define CHECK_VALID(err) \
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do { \
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if (self->data == NULL) { \
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PyErr_SetString(PyExc_ValueError, "mmap closed or invalid"); \
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return err; \
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} \
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} while (0)
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#endif /* UNIX */
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static PyObject *
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mmap_read_byte_method(mmap_object *self,
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PyObject *unused)
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{
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CHECK_VALID(NULL);
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if (self->pos < self->size) {
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char value = self->data[self->pos];
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self->pos += 1;
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return Py_BuildValue("c", value);
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} else {
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PyErr_SetString(PyExc_ValueError, "read byte out of range");
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return NULL;
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}
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}
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static PyObject *
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mmap_read_line_method(mmap_object *self,
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PyObject *unused)
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{
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char *start = self->data+self->pos;
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char *eof = self->data+self->size;
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char *eol;
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PyObject *result;
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CHECK_VALID(NULL);
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eol = memchr(start, '\n', self->size - self->pos);
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if (!eol)
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eol = eof;
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else
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++eol; /* we're interested in the position after the
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newline. */
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result = PyBytes_FromStringAndSize(start, (eol - start));
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self->pos += (eol - start);
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return result;
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}
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static PyObject *
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mmap_read_method(mmap_object *self,
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PyObject *args)
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{
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Py_ssize_t num_bytes;
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PyObject *result;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "n:read", &num_bytes))
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return(NULL);
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/* silently 'adjust' out-of-range requests */
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if ((self->pos + num_bytes) > self->size) {
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num_bytes -= (self->pos+num_bytes) - self->size;
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}
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result = PyBytes_FromStringAndSize(self->data+self->pos, num_bytes);
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self->pos += num_bytes;
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return result;
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}
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static PyObject *
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mmap_find_method(mmap_object *self,
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PyObject *args)
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{
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Py_ssize_t start = self->pos;
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char *needle;
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Py_ssize_t len;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "s#|n:find", &needle, &len, &start)) {
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return NULL;
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} else {
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char *p;
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char *e = self->data + self->size;
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if (start < 0)
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start += self->size;
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if (start < 0)
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start = 0;
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else if ((size_t)start > self->size)
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start = self->size;
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for (p = self->data + start; p + len <= e; ++p) {
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Py_ssize_t i;
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for (i = 0; i < len && needle[i] == p[i]; ++i)
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/* nothing */;
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if (i == len) {
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return PyInt_FromSsize_t(p - self->data);
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}
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}
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return PyInt_FromLong(-1);
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}
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}
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static int
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is_writable(mmap_object *self)
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{
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if (self->access != ACCESS_READ)
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return 1;
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PyErr_Format(PyExc_TypeError, "mmap can't modify a readonly memory map.");
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return 0;
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}
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static int
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is_resizeable(mmap_object *self)
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{
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if (self->exports > 0) {
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PyErr_SetString(PyExc_BufferError,
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"mmap can't resize with extant buffers exported.");
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return 0;
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}
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if ((self->access == ACCESS_WRITE) || (self->access == ACCESS_DEFAULT))
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return 1;
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PyErr_Format(PyExc_TypeError,
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"mmap can't resize a readonly or copy-on-write memory map.");
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return 0;
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}
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static PyObject *
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mmap_write_method(mmap_object *self,
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PyObject *args)
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{
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Py_ssize_t length;
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char *data;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "s#:write", &data, &length))
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return(NULL);
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if (!is_writable(self))
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return NULL;
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if ((self->pos + length) > self->size) {
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PyErr_SetString(PyExc_ValueError, "data out of range");
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return NULL;
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}
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memcpy(self->data+self->pos, data, length);
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self->pos = self->pos+length;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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mmap_write_byte_method(mmap_object *self,
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PyObject *args)
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{
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char value;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "c:write_byte", &value))
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return(NULL);
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if (!is_writable(self))
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return NULL;
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*(self->data+self->pos) = value;
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self->pos += 1;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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mmap_size_method(mmap_object *self,
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PyObject *unused)
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{
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CHECK_VALID(NULL);
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#ifdef MS_WINDOWS
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if (self->file_handle != INVALID_HANDLE_VALUE) {
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DWORD low,high;
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PY_LONG_LONG size;
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low = GetFileSize(self->file_handle, &high);
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if (low == INVALID_FILE_SIZE) {
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/* It might be that the function appears to have failed,
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when indeed its size equals INVALID_FILE_SIZE */
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DWORD error = GetLastError();
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if (error != NO_ERROR)
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return PyErr_SetFromWindowsErr(error);
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}
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if (!high && low < LONG_MAX)
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return PyInt_FromLong((long)low);
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size = (((PY_LONG_LONG)high)<<32) + low;
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return PyLong_FromLongLong(size);
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} else {
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return PyInt_FromSsize_t(self->size);
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}
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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{
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struct stat buf;
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if (-1 == fstat(self->fd, &buf)) {
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PyErr_SetFromErrno(mmap_module_error);
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return NULL;
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}
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return PyInt_FromSsize_t(buf.st_size);
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}
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#endif /* UNIX */
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}
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/* This assumes that you want the entire file mapped,
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/ and when recreating the map will make the new file
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/ have the new size
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/
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/ Is this really necessary? This could easily be done
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/ from python by just closing and re-opening with the
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/ new size?
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*/
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static PyObject *
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mmap_resize_method(mmap_object *self,
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PyObject *args)
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{
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Py_ssize_t new_size;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "n:resize", &new_size) ||
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!is_resizeable(self)) {
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return NULL;
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#ifdef MS_WINDOWS
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} else {
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DWORD dwErrCode = 0;
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DWORD off_hi, off_lo, newSizeLow, newSizeHigh;
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/* First, unmap the file view */
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UnmapViewOfFile(self->data);
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/* Close the mapping object */
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CloseHandle(self->map_handle);
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/* Move to the desired EOF position */
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#if SIZEOF_SIZE_T > 4
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newSizeHigh = (DWORD)((self->offset + new_size) >> 32);
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newSizeLow = (DWORD)((self->offset + new_size) & 0xFFFFFFFF);
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off_hi = (DWORD)(self->offset >> 32);
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off_lo = (DWORD)(self->offset & 0xFFFFFFFF);
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#else
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newSizeHigh = 0;
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newSizeLow = (DWORD)new_size;
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off_hi = 0;
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off_lo = (DWORD)self->offset;
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#endif
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SetFilePointer(self->file_handle,
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newSizeLow, &newSizeHigh, FILE_BEGIN);
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/* Change the size of the file */
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SetEndOfFile(self->file_handle);
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/* Create another mapping object and remap the file view */
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self->map_handle = CreateFileMapping(
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self->file_handle,
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NULL,
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PAGE_READWRITE,
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0,
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0,
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self->tagname);
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if (self->map_handle != NULL) {
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self->data = (char *) MapViewOfFile(self->map_handle,
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FILE_MAP_WRITE,
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off_hi,
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off_lo,
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new_size);
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if (self->data != NULL) {
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self->size = new_size;
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Py_INCREF(Py_None);
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return Py_None;
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} else {
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dwErrCode = GetLastError();
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}
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} else {
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dwErrCode = GetLastError();
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}
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PyErr_SetFromWindowsErr(dwErrCode);
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return NULL;
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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#ifndef HAVE_MREMAP
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} else {
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PyErr_SetString(PyExc_SystemError,
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"mmap: resizing not available--no mremap()");
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return NULL;
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#else
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} else {
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void *newmap;
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if (ftruncate(self->fd, new_size) == -1) {
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PyErr_SetFromErrno(mmap_module_error);
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return NULL;
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}
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#ifdef MREMAP_MAYMOVE
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newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE);
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#else
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newmap = mremap(self->data, self->size, new_size, 0);
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#endif
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if (newmap == (void *)-1)
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{
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PyErr_SetFromErrno(mmap_module_error);
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return NULL;
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}
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self->data = newmap;
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self->size = new_size;
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Py_INCREF(Py_None);
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return Py_None;
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#endif /* HAVE_MREMAP */
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#endif /* UNIX */
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}
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}
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static PyObject *
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mmap_tell_method(mmap_object *self, PyObject *unused)
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{
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CHECK_VALID(NULL);
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return PyInt_FromSize_t(self->pos);
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}
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static PyObject *
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mmap_flush_method(mmap_object *self, PyObject *args)
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{
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Py_ssize_t offset = 0;
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Py_ssize_t size = self->size;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "|nn:flush", &offset, &size))
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return NULL;
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if ((size_t)(offset + size) > self->size) {
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PyErr_SetString(PyExc_ValueError, "flush values out of range");
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return NULL;
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} else {
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#ifdef MS_WINDOWS
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return PyInt_FromLong((long)
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FlushViewOfFile(self->data+offset, size));
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#endif /* MS_WINDOWS */
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#ifdef UNIX
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/* XXX semantics of return value? */
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/* XXX flags for msync? */
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if (-1 == msync(self->data + offset, size,
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MS_SYNC))
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{
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PyErr_SetFromErrno(mmap_module_error);
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return NULL;
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}
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return PyInt_FromLong(0);
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#endif /* UNIX */
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}
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}
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static PyObject *
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mmap_seek_method(mmap_object *self, PyObject *args)
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{
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Py_ssize_t dist;
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int how=0;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, "n|i:seek", &dist, &how))
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return NULL;
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else {
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size_t where;
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switch (how) {
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case 0: /* relative to start */
|
|
if (dist < 0)
|
|
goto onoutofrange;
|
|
where = dist;
|
|
break;
|
|
case 1: /* relative to current position */
|
|
if ((Py_ssize_t)self->pos + dist < 0)
|
|
goto onoutofrange;
|
|
where = self->pos + dist;
|
|
break;
|
|
case 2: /* relative to end */
|
|
if ((Py_ssize_t)self->size + dist < 0)
|
|
goto onoutofrange;
|
|
where = self->size + dist;
|
|
break;
|
|
default:
|
|
PyErr_SetString(PyExc_ValueError, "unknown seek type");
|
|
return NULL;
|
|
}
|
|
if (where > self->size)
|
|
goto onoutofrange;
|
|
self->pos = where;
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
|
|
onoutofrange:
|
|
PyErr_SetString(PyExc_ValueError, "seek out of range");
|
|
return NULL;
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_move_method(mmap_object *self, PyObject *args)
|
|
{
|
|
unsigned long dest, src, count;
|
|
CHECK_VALID(NULL);
|
|
if (!PyArg_ParseTuple(args, "kkk:move", &dest, &src, &count) ||
|
|
!is_writable(self)) {
|
|
return NULL;
|
|
} else {
|
|
/* bounds check the values */
|
|
if (/* end of source after end of data?? */
|
|
((src+count) > self->size)
|
|
/* dest will fit? */
|
|
|| (dest+count > self->size)) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"source or destination out of range");
|
|
return NULL;
|
|
} else {
|
|
memmove(self->data+dest, self->data+src, count);
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct PyMethodDef mmap_object_methods[] = {
|
|
{"close", (PyCFunction) mmap_close_method, METH_NOARGS},
|
|
{"find", (PyCFunction) mmap_find_method, METH_VARARGS},
|
|
{"flush", (PyCFunction) mmap_flush_method, METH_VARARGS},
|
|
{"move", (PyCFunction) mmap_move_method, METH_VARARGS},
|
|
{"read", (PyCFunction) mmap_read_method, METH_VARARGS},
|
|
{"read_byte", (PyCFunction) mmap_read_byte_method, METH_NOARGS},
|
|
{"readline", (PyCFunction) mmap_read_line_method, METH_NOARGS},
|
|
{"resize", (PyCFunction) mmap_resize_method, METH_VARARGS},
|
|
{"seek", (PyCFunction) mmap_seek_method, METH_VARARGS},
|
|
{"size", (PyCFunction) mmap_size_method, METH_NOARGS},
|
|
{"tell", (PyCFunction) mmap_tell_method, METH_NOARGS},
|
|
{"write", (PyCFunction) mmap_write_method, METH_VARARGS},
|
|
{"write_byte", (PyCFunction) mmap_write_byte_method, METH_VARARGS},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
/* Functions for treating an mmap'ed file as a buffer */
|
|
|
|
static int
|
|
mmap_buffer_getbuf(mmap_object *self, Py_buffer *view, int flags)
|
|
{
|
|
CHECK_VALID(-1);
|
|
if (PyBuffer_FillInfo(view, self->data, self->size,
|
|
(self->access == ACCESS_READ), flags) < 0)
|
|
return -1;
|
|
self->exports++;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
mmap_buffer_releasebuf(mmap_object *self, Py_buffer *view)
|
|
{
|
|
self->exports--;
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_object_getattr(mmap_object *self, char *name)
|
|
{
|
|
return Py_FindMethod(mmap_object_methods, (PyObject *)self, name);
|
|
}
|
|
|
|
static Py_ssize_t
|
|
mmap_length(mmap_object *self)
|
|
{
|
|
CHECK_VALID(-1);
|
|
return self->size;
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_item(mmap_object *self, Py_ssize_t i)
|
|
{
|
|
CHECK_VALID(NULL);
|
|
if (i < 0 || (size_t)i >= self->size) {
|
|
PyErr_SetString(PyExc_IndexError, "mmap index out of range");
|
|
return NULL;
|
|
}
|
|
return PyBytes_FromStringAndSize(self->data + i, 1);
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_subscript(mmap_object *self, PyObject *item)
|
|
{
|
|
CHECK_VALID(NULL);
|
|
if (PyIndex_Check(item)) {
|
|
Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
|
|
if (i == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
if (i < 0)
|
|
i += self->size;
|
|
if (i < 0 || (size_t)i > self->size) {
|
|
PyErr_SetString(PyExc_IndexError,
|
|
"mmap index out of range");
|
|
return NULL;
|
|
}
|
|
return PyInt_FromLong(Py_CHARMASK(self->data[i]));
|
|
}
|
|
else if (PySlice_Check(item)) {
|
|
Py_ssize_t start, stop, step, slicelen;
|
|
|
|
if (PySlice_GetIndicesEx((PySliceObject *)item, self->size,
|
|
&start, &stop, &step, &slicelen) < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (slicelen <= 0)
|
|
return PyString_FromStringAndSize("", 0);
|
|
else if (step == 1)
|
|
return PyString_FromStringAndSize(self->data + start,
|
|
slicelen);
|
|
else {
|
|
char *result_buf = (char *)PyMem_Malloc(slicelen);
|
|
Py_ssize_t cur, i;
|
|
PyObject *result;
|
|
|
|
if (result_buf == NULL)
|
|
return PyErr_NoMemory();
|
|
for (cur = start, i = 0; i < slicelen;
|
|
cur += step, i++) {
|
|
result_buf[i] = self->data[cur];
|
|
}
|
|
result = PyString_FromStringAndSize(result_buf,
|
|
slicelen);
|
|
PyMem_Free(result_buf);
|
|
return result;
|
|
}
|
|
}
|
|
else {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap indices must be integers");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_concat(mmap_object *self, PyObject *bb)
|
|
{
|
|
CHECK_VALID(NULL);
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"mmaps don't support concatenation");
|
|
return NULL;
|
|
}
|
|
|
|
static PyObject *
|
|
mmap_repeat(mmap_object *self, Py_ssize_t n)
|
|
{
|
|
CHECK_VALID(NULL);
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"mmaps don't support repeat operation");
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
mmap_ass_item(mmap_object *self, Py_ssize_t i, PyObject *v)
|
|
{
|
|
const char *buf;
|
|
|
|
CHECK_VALID(-1);
|
|
if (i < 0 || (size_t)i >= self->size) {
|
|
PyErr_SetString(PyExc_IndexError, "mmap index out of range");
|
|
return -1;
|
|
}
|
|
if (v == NULL) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap object doesn't support item deletion");
|
|
return -1;
|
|
}
|
|
if (! (PyBytes_Check(v) && PyBytes_Size(v)==1) ) {
|
|
PyErr_SetString(PyExc_IndexError,
|
|
"mmap assignment must be length-1 bytes()");
|
|
return -1;
|
|
}
|
|
if (!is_writable(self))
|
|
return -1;
|
|
buf = PyBytes_AsString(v);
|
|
self->data[i] = buf[0];
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mmap_ass_subscript(mmap_object *self, PyObject *item, PyObject *value)
|
|
{
|
|
CHECK_VALID(-1);
|
|
|
|
if (!is_writable(self))
|
|
return -1;
|
|
|
|
if (PyIndex_Check(item)) {
|
|
Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
|
|
Py_ssize_t v;
|
|
|
|
if (i == -1 && PyErr_Occurred())
|
|
return -1;
|
|
if (i < 0)
|
|
i += self->size;
|
|
if (i < 0 || (size_t)i > self->size) {
|
|
PyErr_SetString(PyExc_IndexError,
|
|
"mmap index out of range");
|
|
return -1;
|
|
}
|
|
if (value == NULL) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap doesn't support item deletion");
|
|
return -1;
|
|
}
|
|
if (!PyIndex_Check(value)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap item value must be an int");
|
|
return -1;
|
|
}
|
|
v = PyNumber_AsSsize_t(value, PyExc_TypeError);
|
|
if (v == -1 && PyErr_Occurred())
|
|
return -1;
|
|
if (v < 0 || v > 255) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"mmap item value must be "
|
|
"in range(0, 256)");
|
|
return -1;
|
|
}
|
|
self->data[i] = v;
|
|
return 0;
|
|
}
|
|
else if (PySlice_Check(item)) {
|
|
Py_ssize_t start, stop, step, slicelen;
|
|
Py_buffer vbuf;
|
|
|
|
if (PySlice_GetIndicesEx((PySliceObject *)item,
|
|
self->size, &start, &stop,
|
|
&step, &slicelen) < 0) {
|
|
return -1;
|
|
}
|
|
if (value == NULL) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap object doesn't support slice deletion");
|
|
return -1;
|
|
}
|
|
if (PyObject_GetBuffer(value, &vbuf, PyBUF_SIMPLE) < 0)
|
|
return -1;
|
|
if (vbuf.len != slicelen) {
|
|
PyErr_SetString(PyExc_IndexError,
|
|
"mmap slice assignment is wrong size");
|
|
PyObject_ReleaseBuffer(value, &vbuf);
|
|
return -1;
|
|
}
|
|
|
|
if (slicelen == 0) {
|
|
}
|
|
else if (step == 1) {
|
|
memcpy(self->data + start, vbuf.buf, slicelen);
|
|
}
|
|
else {
|
|
Py_ssize_t cur, i;
|
|
|
|
for (cur = start, i = 0;
|
|
i < slicelen;
|
|
cur += step, i++)
|
|
{
|
|
self->data[cur] = ((char *)vbuf.buf)[i];
|
|
}
|
|
}
|
|
PyObject_ReleaseBuffer(value, &vbuf);
|
|
return 0;
|
|
}
|
|
else {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"mmap indices must be integer");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static PySequenceMethods mmap_as_sequence = {
|
|
(lenfunc)mmap_length, /*sq_length*/
|
|
(binaryfunc)mmap_concat, /*sq_concat*/
|
|
(ssizeargfunc)mmap_repeat, /*sq_repeat*/
|
|
(ssizeargfunc)mmap_item, /*sq_item*/
|
|
0, /*sq_slice*/
|
|
(ssizeobjargproc)mmap_ass_item, /*sq_ass_item*/
|
|
0, /*sq_ass_slice*/
|
|
};
|
|
|
|
static PyMappingMethods mmap_as_mapping = {
|
|
(lenfunc)mmap_length,
|
|
(binaryfunc)mmap_subscript,
|
|
(objobjargproc)mmap_ass_subscript,
|
|
};
|
|
|
|
static PyBufferProcs mmap_as_buffer = {
|
|
(getbufferproc)mmap_buffer_getbuf,
|
|
(releasebufferproc)mmap_buffer_releasebuf,
|
|
};
|
|
|
|
static PyTypeObject mmap_object_type = {
|
|
PyVarObject_HEAD_INIT(0, 0) /* patched in module init */
|
|
"mmap.mmap", /* tp_name */
|
|
sizeof(mmap_object), /* tp_size */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
(destructor) mmap_object_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
(getattrfunc) mmap_object_getattr, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
0, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
&mmap_as_sequence, /*tp_as_sequence*/
|
|
&mmap_as_mapping, /*tp_as_mapping*/
|
|
0, /*tp_hash*/
|
|
0, /*tp_call*/
|
|
0, /*tp_str*/
|
|
0, /*tp_getattro*/
|
|
0, /*tp_setattro*/
|
|
&mmap_as_buffer, /*tp_as_buffer*/
|
|
Py_TPFLAGS_DEFAULT, /*tp_flags*/
|
|
0, /*tp_doc*/
|
|
};
|
|
|
|
|
|
/* extract the map size from the given PyObject
|
|
|
|
Returns -1 on error, with an appropriate Python exception raised. On
|
|
success, the map size is returned. */
|
|
static Py_ssize_t
|
|
_GetMapSize(PyObject *o, const char* param)
|
|
{
|
|
if (o == NULL)
|
|
return 0;
|
|
if (PyIndex_Check(o)) {
|
|
Py_ssize_t i = PyNumber_AsSsize_t(o, PyExc_OverflowError);
|
|
if (i==-1 && PyErr_Occurred())
|
|
return -1;
|
|
if (i < 0) {
|
|
PyErr_Format(PyExc_OverflowError,
|
|
"memory mapped %s must be positive",
|
|
param);
|
|
return -1;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
PyErr_SetString(PyExc_TypeError, "map size must be an integral value");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef UNIX
|
|
static PyObject *
|
|
new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
|
|
{
|
|
#ifdef HAVE_FSTAT
|
|
struct stat st;
|
|
#endif
|
|
mmap_object *m_obj;
|
|
PyObject *map_size_obj = NULL, *offset_obj = NULL;
|
|
Py_ssize_t map_size, offset;
|
|
int fd, flags = MAP_SHARED, prot = PROT_WRITE | PROT_READ;
|
|
int devzero = -1;
|
|
int access = (int)ACCESS_DEFAULT;
|
|
static char *keywords[] = {"fileno", "length",
|
|
"flags", "prot",
|
|
"access", "offset", NULL};
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwdict, "iO|iiiO", keywords,
|
|
&fd, &map_size_obj, &flags, &prot,
|
|
&access, &offset_obj))
|
|
return NULL;
|
|
map_size = _GetMapSize(map_size_obj, "size");
|
|
if (map_size < 0)
|
|
return NULL;
|
|
offset = _GetMapSize(offset_obj, "offset");
|
|
if (offset < 0)
|
|
return NULL;
|
|
|
|
if ((access != (int)ACCESS_DEFAULT) &&
|
|
((flags != MAP_SHARED) || (prot != (PROT_WRITE | PROT_READ))))
|
|
return PyErr_Format(PyExc_ValueError,
|
|
"mmap can't specify both access and flags, prot.");
|
|
switch ((access_mode)access) {
|
|
case ACCESS_READ:
|
|
flags = MAP_SHARED;
|
|
prot = PROT_READ;
|
|
break;
|
|
case ACCESS_WRITE:
|
|
flags = MAP_SHARED;
|
|
prot = PROT_READ | PROT_WRITE;
|
|
break;
|
|
case ACCESS_COPY:
|
|
flags = MAP_PRIVATE;
|
|
prot = PROT_READ | PROT_WRITE;
|
|
break;
|
|
case ACCESS_DEFAULT:
|
|
/* use the specified or default values of flags and prot */
|
|
break;
|
|
default:
|
|
return PyErr_Format(PyExc_ValueError,
|
|
"mmap invalid access parameter.");
|
|
}
|
|
|
|
#ifdef HAVE_FSTAT
|
|
# ifdef __VMS
|
|
/* on OpenVMS we must ensure that all bytes are written to the file */
|
|
fsync(fd);
|
|
# endif
|
|
if (fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
|
|
if (map_size == 0) {
|
|
map_size = st.st_size;
|
|
} else if ((size_t)offset + (size_t)map_size > st.st_size) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"mmap length is greater than file size");
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif
|
|
m_obj = PyObject_New(mmap_object, &mmap_object_type);
|
|
if (m_obj == NULL) {return NULL;}
|
|
m_obj->data = NULL;
|
|
m_obj->size = (size_t) map_size;
|
|
m_obj->pos = (size_t) 0;
|
|
m_obj->exports = 0;
|
|
m_obj->offset = offset;
|
|
if (fd == -1) {
|
|
m_obj->fd = -1;
|
|
/* Assume the caller wants to map anonymous memory.
|
|
This is the same behaviour as Windows. mmap.mmap(-1, size)
|
|
on both Windows and Unix map anonymous memory.
|
|
*/
|
|
#ifdef MAP_ANONYMOUS
|
|
/* BSD way to map anonymous memory */
|
|
flags |= MAP_ANONYMOUS;
|
|
#else
|
|
/* SVR4 method to map anonymous memory is to open /dev/zero */
|
|
fd = devzero = open("/dev/zero", O_RDWR);
|
|
if (devzero == -1) {
|
|
Py_DECREF(m_obj);
|
|
PyErr_SetFromErrno(mmap_module_error);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
} else {
|
|
m_obj->fd = dup(fd);
|
|
if (m_obj->fd == -1) {
|
|
Py_DECREF(m_obj);
|
|
PyErr_SetFromErrno(mmap_module_error);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
m_obj->data = mmap(NULL, map_size,
|
|
prot, flags,
|
|
fd, offset);
|
|
|
|
if (devzero != -1) {
|
|
close(devzero);
|
|
}
|
|
|
|
if (m_obj->data == (char *)-1) {
|
|
m_obj->data = NULL;
|
|
Py_DECREF(m_obj);
|
|
PyErr_SetFromErrno(mmap_module_error);
|
|
return NULL;
|
|
}
|
|
m_obj->access = (access_mode)access;
|
|
return (PyObject *)m_obj;
|
|
}
|
|
#endif /* UNIX */
|
|
|
|
#ifdef MS_WINDOWS
|
|
static PyObject *
|
|
new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
|
|
{
|
|
mmap_object *m_obj;
|
|
PyObject *map_size_obj = NULL, *offset_obj = NULL;
|
|
Py_ssize_t map_size, offset;
|
|
DWORD off_hi; /* upper 32 bits of offset */
|
|
DWORD off_lo; /* lower 32 bits of offset */
|
|
DWORD size_hi; /* upper 32 bits of size */
|
|
DWORD size_lo; /* lower 32 bits of size */
|
|
char *tagname = "";
|
|
DWORD dwErr = 0;
|
|
int fileno;
|
|
HANDLE fh = 0;
|
|
int access = (access_mode)ACCESS_DEFAULT;
|
|
DWORD flProtect, dwDesiredAccess;
|
|
static char *keywords[] = { "fileno", "length",
|
|
"tagname",
|
|
"access", "offset", NULL };
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwdict, "iO|ziO", keywords,
|
|
&fileno, &map_size_obj,
|
|
&tagname, &access, &offset_obj)) {
|
|
return NULL;
|
|
}
|
|
|
|
switch((access_mode)access) {
|
|
case ACCESS_READ:
|
|
flProtect = PAGE_READONLY;
|
|
dwDesiredAccess = FILE_MAP_READ;
|
|
break;
|
|
case ACCESS_DEFAULT: case ACCESS_WRITE:
|
|
flProtect = PAGE_READWRITE;
|
|
dwDesiredAccess = FILE_MAP_WRITE;
|
|
break;
|
|
case ACCESS_COPY:
|
|
flProtect = PAGE_WRITECOPY;
|
|
dwDesiredAccess = FILE_MAP_COPY;
|
|
break;
|
|
default:
|
|
return PyErr_Format(PyExc_ValueError,
|
|
"mmap invalid access parameter.");
|
|
}
|
|
|
|
map_size = _GetMapSize(map_size_obj, "size");
|
|
if (map_size < 0)
|
|
return NULL;
|
|
offset = _GetMapSize(offset_obj, "offset");
|
|
if (offset < 0)
|
|
return NULL;
|
|
|
|
/* assume -1 and 0 both mean invalid filedescriptor
|
|
to 'anonymously' map memory.
|
|
XXX: fileno == 0 is a valid fd, but was accepted prior to 2.5.
|
|
XXX: Should this code be added?
|
|
if (fileno == 0)
|
|
PyErr_WarnEx(PyExc_DeprecationWarning,
|
|
"don't use 0 for anonymous memory",
|
|
1);
|
|
*/
|
|
if (fileno != -1 && fileno != 0) {
|
|
fh = (HANDLE)_get_osfhandle(fileno);
|
|
if (fh==(HANDLE)-1) {
|
|
PyErr_SetFromErrno(mmap_module_error);
|
|
return NULL;
|
|
}
|
|
/* Win9x appears to need us seeked to zero */
|
|
lseek(fileno, 0, SEEK_SET);
|
|
}
|
|
|
|
m_obj = PyObject_New(mmap_object, &mmap_object_type);
|
|
if (m_obj == NULL)
|
|
return NULL;
|
|
/* Set every field to an invalid marker, so we can safely
|
|
destruct the object in the face of failure */
|
|
m_obj->data = NULL;
|
|
m_obj->file_handle = INVALID_HANDLE_VALUE;
|
|
m_obj->map_handle = INVALID_HANDLE_VALUE;
|
|
m_obj->tagname = NULL;
|
|
m_obj->offset = offset;
|
|
|
|
if (fh) {
|
|
/* It is necessary to duplicate the handle, so the
|
|
Python code can close it on us */
|
|
if (!DuplicateHandle(
|
|
GetCurrentProcess(), /* source process handle */
|
|
fh, /* handle to be duplicated */
|
|
GetCurrentProcess(), /* target proc handle */
|
|
(LPHANDLE)&m_obj->file_handle, /* result */
|
|
0, /* access - ignored due to options value */
|
|
FALSE, /* inherited by child processes? */
|
|
DUPLICATE_SAME_ACCESS)) { /* options */
|
|
dwErr = GetLastError();
|
|
Py_DECREF(m_obj);
|
|
PyErr_SetFromWindowsErr(dwErr);
|
|
return NULL;
|
|
}
|
|
if (!map_size) {
|
|
DWORD low,high;
|
|
low = GetFileSize(fh, &high);
|
|
/* low might just happen to have the value INVALID_FILE_SIZE;
|
|
so we need to check the last error also. */
|
|
if (low == INVALID_FILE_SIZE &&
|
|
(dwErr = GetLastError()) != NO_ERROR) {
|
|
Py_DECREF(m_obj);
|
|
return PyErr_SetFromWindowsErr(dwErr);
|
|
}
|
|
|
|
#if SIZEOF_SIZE_T > 4
|
|
m_obj->size = (((size_t)high)<<32) + low;
|
|
#else
|
|
if (high)
|
|
/* File is too large to map completely */
|
|
m_obj->size = (size_t)-1;
|
|
else
|
|
m_obj->size = low;
|
|
#endif
|
|
} else {
|
|
m_obj->size = map_size;
|
|
}
|
|
}
|
|
else {
|
|
m_obj->size = map_size;
|
|
}
|
|
|
|
/* set the initial position */
|
|
m_obj->pos = (size_t) 0;
|
|
|
|
m_obj->exports = 0;
|
|
/* set the tag name */
|
|
if (tagname != NULL && *tagname != '\0') {
|
|
m_obj->tagname = PyMem_Malloc(strlen(tagname)+1);
|
|
if (m_obj->tagname == NULL) {
|
|
PyErr_NoMemory();
|
|
Py_DECREF(m_obj);
|
|
return NULL;
|
|
}
|
|
strcpy(m_obj->tagname, tagname);
|
|
}
|
|
else
|
|
m_obj->tagname = NULL;
|
|
|
|
m_obj->access = (access_mode)access;
|
|
/* DWORD is a 4-byte int. If we're on a box where size_t consumes
|
|
* more than 4 bytes, we need to break it apart. Else (size_t
|
|
* consumes 4 bytes), C doesn't define what happens if we shift
|
|
* right by 32, so we need different code.
|
|
*/
|
|
#if SIZEOF_SIZE_T > 4
|
|
size_hi = (DWORD)((offset + m_obj->size) >> 32);
|
|
size_lo = (DWORD)((offset + m_obj->size) & 0xFFFFFFFF);
|
|
off_hi = (DWORD)(offset >> 32);
|
|
off_lo = (DWORD)(offset & 0xFFFFFFFF);
|
|
#else
|
|
size_hi = 0;
|
|
size_lo = (DWORD)(offset + m_obj->size);
|
|
off_hi = 0;
|
|
off_lo = (DWORD)offset;
|
|
#endif
|
|
/* For files, it would be sufficient to pass 0 as size.
|
|
For anonymous maps, we have to pass the size explicitly. */
|
|
m_obj->map_handle = CreateFileMapping(m_obj->file_handle,
|
|
NULL,
|
|
flProtect,
|
|
size_hi,
|
|
size_lo,
|
|
m_obj->tagname);
|
|
if (m_obj->map_handle != NULL) {
|
|
m_obj->data = (char *) MapViewOfFile(m_obj->map_handle,
|
|
dwDesiredAccess,
|
|
off_hi,
|
|
off_lo,
|
|
0);
|
|
if (m_obj->data != NULL)
|
|
return (PyObject *)m_obj;
|
|
else
|
|
dwErr = GetLastError();
|
|
} else
|
|
dwErr = GetLastError();
|
|
Py_DECREF(m_obj);
|
|
PyErr_SetFromWindowsErr(dwErr);
|
|
return NULL;
|
|
}
|
|
#endif /* MS_WINDOWS */
|
|
|
|
/* List of functions exported by this module */
|
|
static struct PyMethodDef mmap_functions[] = {
|
|
{"mmap", (PyCFunction) new_mmap_object,
|
|
METH_VARARGS|METH_KEYWORDS},
|
|
{NULL, NULL} /* Sentinel */
|
|
};
|
|
|
|
static void
|
|
setint(PyObject *d, const char *name, long value)
|
|
{
|
|
PyObject *o = PyInt_FromLong(value);
|
|
if (o && PyDict_SetItemString(d, name, o) == 0) {
|
|
Py_DECREF(o);
|
|
}
|
|
}
|
|
|
|
PyMODINIT_FUNC
|
|
initmmap(void)
|
|
{
|
|
PyObject *dict, *module;
|
|
|
|
/* Patch the object type */
|
|
Py_Type(&mmap_object_type) = &PyType_Type;
|
|
|
|
module = Py_InitModule("mmap", mmap_functions);
|
|
if (module == NULL)
|
|
return;
|
|
dict = PyModule_GetDict(module);
|
|
if (!dict)
|
|
return;
|
|
mmap_module_error = PyExc_EnvironmentError;
|
|
PyDict_SetItemString(dict, "error", mmap_module_error);
|
|
#ifdef PROT_EXEC
|
|
setint(dict, "PROT_EXEC", PROT_EXEC);
|
|
#endif
|
|
#ifdef PROT_READ
|
|
setint(dict, "PROT_READ", PROT_READ);
|
|
#endif
|
|
#ifdef PROT_WRITE
|
|
setint(dict, "PROT_WRITE", PROT_WRITE);
|
|
#endif
|
|
|
|
#ifdef MAP_SHARED
|
|
setint(dict, "MAP_SHARED", MAP_SHARED);
|
|
#endif
|
|
#ifdef MAP_PRIVATE
|
|
setint(dict, "MAP_PRIVATE", MAP_PRIVATE);
|
|
#endif
|
|
#ifdef MAP_DENYWRITE
|
|
setint(dict, "MAP_DENYWRITE", MAP_DENYWRITE);
|
|
#endif
|
|
#ifdef MAP_EXECUTABLE
|
|
setint(dict, "MAP_EXECUTABLE", MAP_EXECUTABLE);
|
|
#endif
|
|
#ifdef MAP_ANONYMOUS
|
|
setint(dict, "MAP_ANON", MAP_ANONYMOUS);
|
|
setint(dict, "MAP_ANONYMOUS", MAP_ANONYMOUS);
|
|
#endif
|
|
|
|
setint(dict, "PAGESIZE", (long)my_getpagesize());
|
|
|
|
setint(dict, "ALLOCATIONGRANULARITY", (long)my_getallocationgranularity());
|
|
|
|
setint(dict, "ACCESS_READ", ACCESS_READ);
|
|
setint(dict, "ACCESS_WRITE", ACCESS_WRITE);
|
|
setint(dict, "ACCESS_COPY", ACCESS_COPY);
|
|
}
|