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	<div>You are a helpful software engineer assistant.<span class="token yellow"><｜User｜></span><uploaded_files>
	/testbed
	</uploaded_files>
	I've uploaded a code repository in the directory /testbed (not in /tmp/inputs). Consider the following PR description:

	<pr_description>
	Bug in posix implementation of django/core/files/locks.py
	Description

	The posix version of locks (the version which supports import fcntl) has a bug. The code attempts to return True to indicate success or failure acquiring a lock, but instead it always returns False. The reason is that cpython fcntl module returns None if successful, and raises an OSError to indicate failure (see https://docs.python.org/3/library/fcntl.html#fcntl.flock).
	Anyone interested in using the non-blocking (i.e. locks.LOCKS_NB) requires a valid return value to know if they have successfully acquired the lock.
	I believe the correct implementation should be the following:
	diff --git a/django/core/files/locks.py b/django/core/files/locks.py
	index c46b00b905..4938347ea7 100644
	--- a/django/core/files/locks.py
	+++ b/django/core/files/locks.py
	@@ -107,9 +107,15 @@ else:
	return True
	else:
	def lock(f, flags):
	- ret = fcntl.flock(_fd(f), flags)
	- return ret == 0
	+ try:
	+ fcntl.flock(_fd(f), flags)
	+ return True
	+ except OSError:
	+ return False
	def unlock(f):
	- ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)
	- return ret == 0
	+ try:
	+ fcntl.flock(_fd(f), fcntl.LOCK_UN)
	+ return True
	+ except OSError:
	+ return False

	</pr_description>

	Can you help me implement the necessary changes to the repository so that the requirements specified in the <pr_description> are met?
	I've already taken care of all changes to any of the test files described in the <pr_description>. This means you DON'T have to modify the testing logic or any of the tests in any way!

	Your task is to make the minimal changes to non-tests files in the /testbed directory to ensure the <pr_description> is satisfied.

	You are only allowed to call ONE function each time!<span class="token yellow"><｜Assistant｜></span><span class="token red"></think></span>I'll help you implement the necessary changes to fix the bug in the posix implementation of `django/core/files/locks.py`. Let me start by examining the current state of the file.<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "view", "path": "/testbed/django/core/files/locks.py"}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>Here's the content of /testbed/django/core/files/locks.py with line numbers (which has a total of 116 lines):
	1 """
	2 Portable file locking utilities.
	3
	4 Based partially on an example by Jonathan Feignberg in the Python
	5 Cookbook [1] (licensed under the Python Software License) and a ctypes port by
	6 Anatoly Techtonik for Roundup [2] (license [3]).
	7
	8 [1] http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203
	9 [2] https://sourceforge.net/p/roundup/code/ci/default/tree/roundup/backends/portalocker.py
	10 [3] https://sourceforge.net/p/roundup/code/ci/default/tree/COPYING.txt
	11
	12 Example Usage::
	13
	14 >>> from django.core.files import locks
	15 >>> with open('./file', 'wb') as f:
	16 ... locks.lock(f, locks.LOCK_EX)
	17 ... f.write('Django')
	18 """
	19 import os
	20
	21 __all__ = ('LOCK_EX', 'LOCK_SH', 'LOCK_NB', 'lock', 'unlock')
	22
	23
	24 def _fd(f):
	25 """Get a filedescriptor from something which could be a file or an fd."""
	26 return f.fileno() if hasattr(f, 'fileno') else f
	27
	28
	29 if os.name == 'nt':
	30 import msvcrt
	31 from ctypes import (
	32 POINTER, Structure, Union, byref, c_int64, c_ulong, c_void_p, sizeof,
	33 windll,
	34 )
	35 from ctypes.wintypes import BOOL, DWORD, HANDLE
	36
	37 LOCK_SH = 0 # the default
	38 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
	39 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
	40
	41 # --- Adapted from the pyserial project ---
	42 # detect size of ULONG_PTR
	43 if sizeof(c_ulong) != sizeof(c_void_p):
	44 ULONG_PTR = c_int64
	45 else:
	46 ULONG_PTR = c_ulong
	47 PVOID = c_void_p
	48
	49 # --- Union inside Structure by stackoverflow:3480240 ---
	50 class _OFFSET(Structure):
	51 _fields_ = [
	52 ('Offset', DWORD),
	53 ('OffsetHigh', DWORD)]
	54
	55 class _OFFSET_UNION(Union):
	56 _anonymous_ = ['_offset']
	57 _fields_ = [
	58 ('_offset', _OFFSET),
	59 ('Pointer', PVOID)]
	60
	61 class OVERLAPPED(Structure):
	62 _anonymous_ = ['_offset_union']
	63 _fields_ = [
	64 ('Internal', ULONG_PTR),
	65 ('InternalHigh', ULONG_PTR),
	66 ('_offset_union', _OFFSET_UNION),
	67 ('hEvent', HANDLE)]
	68
	69 LPOVERLAPPED = POINTER(OVERLAPPED)
	70
	71 # --- Define function prototypes for extra safety ---
	72 LockFileEx = windll.kernel32.LockFileEx
	73 LockFileEx.restype = BOOL
	74 LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
	75 UnlockFileEx = windll.kernel32.UnlockFileEx
	76 UnlockFileEx.restype = BOOL
	77 UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
	78
	79 def lock(f, flags):
	80 hfile = msvcrt.get_osfhandle(_fd(f))
	81 overlapped = OVERLAPPED()
	82 ret = LockFileEx(hfile, flags, 0, 0, 0xFFFF0000, byref(overlapped))
	83 return bool(ret)
	84
	85 def unlock(f):
	86 hfile = msvcrt.get_osfhandle(_fd(f))
	87 overlapped = OVERLAPPED()
	88 ret = UnlockFileEx(hfile, 0, 0, 0xFFFF0000, byref(overlapped))
	89 return bool(ret)
	90 else:
	91 try:
	92 import fcntl
	93 LOCK_SH = fcntl.LOCK_SH # shared lock
	94 LOCK_NB = fcntl.LOCK_NB # non-blocking
	95 LOCK_EX = fcntl.LOCK_EX
	96 except (ImportError, AttributeError):
	97 # File locking is not supported.
	98 LOCK_EX = LOCK_SH = LOCK_NB = 0
	99
	100 # Dummy functions that don't do anything.
	101 def lock(f, flags):
	102 # File is not locked
	103 return False
	104
	105 def unlock(f):
	106 # File is unlocked
	107 return True
	108 else:
	109 def lock(f, flags):
	110 ret = fcntl.flock(_fd(f), flags)
	111 return ret == 0
	112
	113 def unlock(f):
	114 ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)
	115 return ret == 0
	116
	<span class="token green"><｜tool▁output▁end｜></span>Now I can see the issue. Looking at the current implementation in lines 109-115, the code is trying to compare the return value of `fcntl.flock()` with 0, but according to the PR description, `fcntl.flock()` returns `None` on success and raises an `OSError` on failure. This means the current implementation will always return `False` because `None == 0` is `False`.

	Let me examine the specific lines that need to be changed:<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "view", "path": "/testbed/django/core/files/locks.py", "view_range": [109,116]}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>Here's the content of /testbed/django/core/files/locks.py with line numbers (which has a total of 116 lines) with view_range=[109, 116]:
	109 def lock(f, flags):
	110 ret = fcntl.flock(_fd(f), flags)
	111 return ret == 0
	112
	113 def unlock(f):
	114 ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)
	115 return ret == 0
	116
	<span class="token green"><｜tool▁output▁end｜></span>Now I'll implement the fix as described in the PR description. The fix should wrap the `fcntl.flock()` calls in try-except blocks, returning `True` on success and `False` on `OSError`:<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "str_replace", "path": "/testbed/django/core/files/locks.py", "old_str": " def lock(f, flags):\n ret = fcntl.flock(_fd(f), flags)\n return ret == 0\n\n def unlock(f):\n ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)\n return ret == 0", "new_str": " def lock(f, flags):\n try:\n fcntl.flock(_fd(f), flags)\n return True\n except OSError:\n return False\n\n def unlock(f):\n try:\n fcntl.flock(_fd(f), fcntl.LOCK_UN)\n return True\n except OSError:\n return False"}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>The file /testbed/django/core/files/locks.py has been edited successfully.<span class="token green"><｜tool▁output▁end｜></span>Let me verify the changes by viewing the modified section:<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "view", "path": "/testbed/django/core/files/locks.py", "view_range": [109,116]}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>Here's the content of /testbed/django/core/files/locks.py with line numbers (which has a total of 122 lines) with view_range=[109, 116]:
	109 def lock(f, flags):
	110 try:
	111 fcntl.flock(_fd(f), flags)
	112 return True
	113 except OSError:
	114 return False
	115
	116 def unlock(f):
	<span class="token green"><｜tool▁output▁end｜></span><span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "view", "path": "/testbed/django/core/files/locks.py", "view_range": [116,122]}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>Here's the content of /testbed/django/core/files/locks.py with line numbers (which has a total of 122 lines) with view_range=[116, 122]:
	116 def unlock(f):
	117 try:
	118 fcntl.flock(_fd(f), fcntl.LOCK_UN)
	119 return True
	120 except OSError:
	121 return False
	122
	<span class="token green"><｜tool▁output▁end｜></span>Perfect! The changes have been successfully implemented. Let me verify the complete file structure to ensure everything looks correct:<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>str_replace_editor<span class="token green"><｜tool▁sep｜></span>{"command": "view", "path": "/testbed/django/core/files/locks.py", "view_range": [90,122]}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span>Here's the content of /testbed/django/core/files/locks.py with line numbers (which has a total of 122 lines) with view_range=[90, 122]:
	90 else:
	91 try:
	92 import fcntl
	93 LOCK_SH = fcntl.LOCK_SH # shared lock
	94 LOCK_NB = fcntl.LOCK_NB # non-blocking
	95 LOCK_EX = fcntl.LOCK_EX
	96 except (ImportError, AttributeError):
	97 # File locking is not supported.
	98 LOCK_EX = LOCK_SH = LOCK_NB = 0
	99
	100 # Dummy functions that don't do anything.
	101 def lock(f, flags):
	102 # File is not locked
	103 return False
	104
	105 def unlock(f):
	106 # File is unlocked
	107 return True
	108 else:
	109 def lock(f, flags):
	110 try:
	111 fcntl.flock(_fd(f), flags)
	112 return True
	113 except OSError:
	114 return False
	115
	116 def unlock(f):
	117 try:
	118 fcntl.flock(_fd(f), fcntl.LOCK_UN)
	119 return True
	120 except OSError:
	121 return False
	122
	<span class="token green"><｜tool▁output▁end｜></span>Excellent! The changes have been successfully implemented. Let me run a quick test to make sure the file is syntactically correct:<span class="token green"><｜tool▁calls▁begin｜></span><span class="token green"><｜tool▁call▁begin｜></span>bash<span class="token green"><｜tool▁sep｜></span>{"command": "cd /testbed && python -m py_compile django/core/files/locks.py"}<span class="token green"><｜tool▁call▁end｜></span><span class="token green"><｜tool▁calls▁end｜></span><span class="token yellow"><｜end▁of▁sentence｜></span><span class="token green"><｜tool▁output▁begin｜></span><span class="token green"><｜tool▁output▁end｜></span>Great! The file compiles without any syntax errors.

	## Summary

	I have successfully implemented the fix for the bug in the posix implementation of `django/core/files/locks.py`. The changes made are:

	1. Modified the `lock()` function (lines 109-114): Wrapped the `fcntl.flock()` call in a try-except block that returns `True` on success and `False` when an `OSError` is raised.

	2. Modified the `unlock()` function (lines 116-121): Similarly wrapped the `fcntl.flock()` call in a try-except block that returns `True` on success and `False` when an `OSError` is raised.

	The fix addresses the core issue described in the PR:
	- The original code incorrectly compared the return value of `fcntl.flock()` with 0, but `fcntl.flock()` returns `None` on success and raises an `OSError` on failure
	- This meant the functions always returned `False` (`None == 0` is `False`)
	- The new implementation properly handles the success/failure cases by using try-except blocks
	- This is particularly important for non-blocking locks (`LOCK_NB`) where callers need to know if the lock was successfully acquired

	The changes are minimal and focused, exactly matching the suggested fix in the PR description.<span class="token yellow"><｜end▁of▁sentence｜></span></div>