mirror of
https://github.com/lutris/lutris
synced 2024-09-15 22:09:55 +00:00
Add support for detecting Linux 5.16's futex_waitv syscall as fsync support.
This commit is contained in:
parent
6faf4211a9
commit
0e6db6f3c3
|
@ -285,12 +285,134 @@ def is_futex2_supported():
|
|||
return True
|
||||
|
||||
|
||||
# Hardcode some of the most commonly used architectures's
|
||||
# futex_waitv syscall numbers.
|
||||
_NR_FUTEX_WAITV_PER_ARCH = {
|
||||
("i386", 32): 449,
|
||||
("i686", 32): 449,
|
||||
("x86_64", 32): 449,
|
||||
("x86_64", 64): 449,
|
||||
("aarch64", 64): 449,
|
||||
("aarch64_be", 64): 449,
|
||||
("armv8b", 32): 449,
|
||||
("armv8l", 32): 449,
|
||||
}
|
||||
|
||||
|
||||
def _get_futex_waitv_syscall_nr():
|
||||
"""Get the syscall number of the Linux futex_waitv() syscall.
|
||||
|
||||
Returns:
|
||||
The futex_waitv() syscall number.
|
||||
|
||||
Raises:
|
||||
RuntimeError: When the syscall number could not be determined.
|
||||
"""
|
||||
bits = ctypes.sizeof(ctypes.c_void_p) * 8
|
||||
|
||||
try:
|
||||
return _NR_FUTEX_WAITV_PER_ARCH[(os.uname()[4], bits)]
|
||||
except KeyError:
|
||||
pass
|
||||
|
||||
return _get_syscall_nr_from_headers('futex_waitv')
|
||||
|
||||
|
||||
# pylint: disable=invalid-name,too-few-public-methods
|
||||
class futex_waitv(ctypes.Structure):
|
||||
"""Linux kernel compatible futex_waitv type.
|
||||
|
||||
Fields:
|
||||
val: The expected value.
|
||||
uaddr: The address to wait for.
|
||||
flags: The type and size of the futex.
|
||||
"""
|
||||
__slots__ = ()
|
||||
_fields_ = [
|
||||
("val", ctypes.c_uint64),
|
||||
("uaddr", ctypes.c_void_p),
|
||||
("flags", ctypes.c_uint),
|
||||
]
|
||||
|
||||
|
||||
def _get_futex_waitv_syscall():
|
||||
"""Create a function that can be used to execute the Linux
|
||||
futex_waitv() syscall.
|
||||
|
||||
Returns:
|
||||
A proxy function for the Linux futex_waitv() syscall.
|
||||
|
||||
Raises:
|
||||
AttributeError: When the libc has no syscall() function.
|
||||
RuntimeError: When the syscall number could not be determined.
|
||||
"""
|
||||
futex_waitv_syscall = ctypes.CDLL(None, use_errno=True).syscall
|
||||
futex_waitv_syscall.argtypes = (ctypes.c_long, ctypes.POINTER(futex_waitv),
|
||||
ctypes.c_uint, ctypes.c_uint,
|
||||
ctypes.POINTER(timespec))
|
||||
futex_waitv_syscall.restype = ctypes.c_long
|
||||
futex_waitv_syscall_nr = _get_futex_waitv_syscall_nr()
|
||||
|
||||
# pylint: disable=too-many-arguments
|
||||
def _futex_waitv_syscall(waiters, nr_futexes, flags, timeout):
|
||||
"""Invoke the Linux futex_waitv() syscall with the provided
|
||||
arguments.
|
||||
|
||||
Args:
|
||||
See the description of the futex_waitv() syscall for the
|
||||
parameter meanings.
|
||||
`waiters` is automatically converted to a pointer.
|
||||
If timeout is None, a zero timeout is passed.
|
||||
|
||||
Returns:
|
||||
A tuple of the return value of the syscall and the error code
|
||||
in case an error occurred.
|
||||
|
||||
Raises:
|
||||
AttributeError: When the libc has no syscall() function.
|
||||
RuntimeError: When the syscall number could not be determined.
|
||||
TypeError: If `waiters` is not a pointer and can't be
|
||||
converted into one.
|
||||
"""
|
||||
error = futex_waitv_syscall(
|
||||
futex_waitv_syscall_nr,
|
||||
_coerce_to_pointer(waiters),
|
||||
nr_futexes,
|
||||
flags,
|
||||
_coerce_to_pointer(timeout)
|
||||
)
|
||||
return error, (ctypes.get_errno() if error == -1 else 0)
|
||||
|
||||
return _futex_waitv_syscall
|
||||
|
||||
|
||||
@functools.lru_cache(None)
|
||||
def is_futex_waitv_supported():
|
||||
"""Checks whether the Linux 5.16 futex_waitv syscall is supported on
|
||||
this kernel.
|
||||
|
||||
Returns:
|
||||
Whether this kernel supports the futex_waitv syscall.
|
||||
"""
|
||||
try:
|
||||
ret = _get_futex_waitv_syscall()(None, 0, 0, None)
|
||||
return ret[1] != errno.ENOSYS
|
||||
except (AttributeError, RuntimeError):
|
||||
return False
|
||||
|
||||
|
||||
@functools.lru_cache(None)
|
||||
def is_fsync_supported():
|
||||
"""Checks whether the FUTEX_WAIT_MULTIPLE operation or the futex2
|
||||
syscall is supported on this kernel.
|
||||
"""Checks whether the FUTEX_WAIT_MULTIPLE operation, the futex2
|
||||
syscalls, or the futex_waitv syscall is supported on this kernel.
|
||||
|
||||
Returns:
|
||||
The result of the check.
|
||||
"""
|
||||
return is_futex_wait_multiple_supported() or is_futex2_supported()
|
||||
if is_futex_waitv_supported():
|
||||
return True
|
||||
if is_futex2_supported():
|
||||
return True
|
||||
if is_futex_wait_multiple_supported():
|
||||
return True
|
||||
return False
|
||||
|
|
Loading…
Reference in a new issue