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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	60 B	-rw-r--r--
base.py	4.7 KB	-rw-r--r--
images.py	2.51 KB	-rw-r--r--
locks.py	3.5 KB	-rw-r--r--
move.py	2.9 KB	-rw-r--r--
storage.py	15.56 KB	-rw-r--r--
temp.py	2.43 KB	-rw-r--r--
uploadedfile.py	3.9 KB	-rw-r--r--
uploadhandler.py	6.79 KB	-rw-r--r--
utils.py	2.54 KB	-rw-r--r--

Code Editor : locks.py

"""
Portable file locking utilities.

Based partially on an example by Jonathan Feignberg in the Python
Cookbook [1] (licensed under the Python Software License) and a ctypes port by
Anatoly Techtonik for Roundup [2] (license [3]).

[1] http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203
[2] https://sourceforge.net/p/roundup/code/ci/default/tree/roundup/backends/portalocker.py
[3] https://sourceforge.net/p/roundup/code/ci/default/tree/COPYING.txt

Example Usage::

>>> from django.core.files import locks
    >>> with open('./file', 'wb') as f:
    ...     locks.lock(f, locks.LOCK_EX)
    ...     f.write('Django')
"""
import os

__all__ = ('LOCK_EX', 'LOCK_SH', 'LOCK_NB', 'lock', 'unlock')

def _fd(f):
    """Get a filedescriptor from something which could be a file or an fd."""
    return f.fileno() if hasattr(f, 'fileno') else f

if os.name == 'nt':
    import msvcrt
    from ctypes import (
        POINTER, Structure, Union, byref, c_int64, c_ulong, c_void_p, sizeof,
        windll,
    )
    from ctypes.wintypes import BOOL, DWORD, HANDLE

LOCK_SH = 0  # the default
    LOCK_NB = 0x1  # LOCKFILE_FAIL_IMMEDIATELY
    LOCK_EX = 0x2  # LOCKFILE_EXCLUSIVE_LOCK

# --- Adapted from the pyserial project ---
    # detect size of ULONG_PTR
    if sizeof(c_ulong) != sizeof(c_void_p):
        ULONG_PTR = c_int64
    else:
        ULONG_PTR = c_ulong
    PVOID = c_void_p

# --- Union inside Structure by stackoverflow:3480240 ---
    class _OFFSET(Structure):
        _fields_ = [
            ('Offset', DWORD),
            ('OffsetHigh', DWORD)]

class _OFFSET_UNION(Union):
        _anonymous_ = ['_offset']
        _fields_ = [
            ('_offset', _OFFSET),
            ('Pointer', PVOID)]

class OVERLAPPED(Structure):
        _anonymous_ = ['_offset_union']
        _fields_ = [
            ('Internal', ULONG_PTR),
            ('InternalHigh', ULONG_PTR),
            ('_offset_union', _OFFSET_UNION),
            ('hEvent', HANDLE)]

LPOVERLAPPED = POINTER(OVERLAPPED)

# --- Define function prototypes for extra safety ---
    LockFileEx = windll.kernel32.LockFileEx
    LockFileEx.restype = BOOL
    LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
    UnlockFileEx = windll.kernel32.UnlockFileEx
    UnlockFileEx.restype = BOOL
    UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]

def lock(f, flags):
        hfile = msvcrt.get_osfhandle(_fd(f))
        overlapped = OVERLAPPED()
        ret = LockFileEx(hfile, flags, 0, 0, 0xFFFF0000, byref(overlapped))
        return bool(ret)

def unlock(f):
        hfile = msvcrt.get_osfhandle(_fd(f))
        overlapped = OVERLAPPED()
        ret = UnlockFileEx(hfile, 0, 0, 0xFFFF0000, byref(overlapped))
        return bool(ret)
else:
    try:
        import fcntl
        LOCK_SH = fcntl.LOCK_SH  # shared lock
        LOCK_NB = fcntl.LOCK_NB  # non-blocking
        LOCK_EX = fcntl.LOCK_EX
    except (ImportError, AttributeError):
        # File locking is not supported.
        LOCK_EX = LOCK_SH = LOCK_NB = 0

# Dummy functions that don't do anything.
        def lock(f, flags):
            # File is not locked
            return False

def unlock(f):
            # File is unlocked
            return True
    else:
        def lock(f, flags):
            try:
                fcntl.flock(_fd(f), flags)
                return True
            except BlockingIOError:
                return False

def unlock(f):
            fcntl.flock(_fd(f), fcntl.LOCK_UN)
            return True

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Code Editor : locks.py