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"""Platform compatibility."""
import platform
import re
import sys
# Jython does not have this attribute
import typing
try:
from socket import SOL_TCP
except ImportError: # pragma: no cover
from socket import IPPROTO_TCP as SOL_TCP # noqa
RE_NUM = re.compile(r'(\d+).+')
def _linux_version_to_tuple(s: str) -> typing.Tuple[int, int, int]:
return tuple(map(_versionatom, s.split('.')[:3]))
def _versionatom(s: str) -> int:
if s.isdigit():
return int(s)
match = RE_NUM.match(s)
return int(match.groups()[0]) if match else 0
# available socket options for TCP level
KNOWN_TCP_OPTS = {
'TCP_CORK', 'TCP_DEFER_ACCEPT', 'TCP_KEEPCNT',
'TCP_KEEPIDLE', 'TCP_KEEPINTVL', 'TCP_LINGER2',
'TCP_MAXSEG', 'TCP_NODELAY', 'TCP_QUICKACK',
'TCP_SYNCNT', 'TCP_USER_TIMEOUT', 'TCP_WINDOW_CLAMP',
}
LINUX_VERSION = None
if sys.platform.startswith('linux'):
LINUX_VERSION = _linux_version_to_tuple(platform.release())
if LINUX_VERSION < (2, 6, 37):
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
# Windows Subsystem for Linux is an edge-case: the Python socket library
# returns most TCP_* enums, but they aren't actually supported
if platform.release().endswith("Microsoft"):
KNOWN_TCP_OPTS = {'TCP_NODELAY', 'TCP_KEEPIDLE', 'TCP_KEEPINTVL',
'TCP_KEEPCNT'}
elif sys.platform.startswith('darwin'):
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
elif 'bsd' in sys.platform:
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
# According to MSDN Windows platforms support getsockopt(TCP_MAXSSEG) but not
# setsockopt(TCP_MAXSEG) on IPPROTO_TCP sockets.
elif sys.platform.startswith('win'):
KNOWN_TCP_OPTS = {'TCP_NODELAY'}
elif sys.platform.startswith('cygwin'):
KNOWN_TCP_OPTS = {'TCP_NODELAY'}
# illumos does not allow to set the TCP_MAXSEG socket option,
# even if the Oracle documentation says otherwise.
# TCP_USER_TIMEOUT does not exist on Solaris 11.4
elif sys.platform.startswith('sunos'):
KNOWN_TCP_OPTS.remove('TCP_MAXSEG')
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
# aix does not allow to set the TCP_MAXSEG
# or the TCP_USER_TIMEOUT socket options.
elif sys.platform.startswith('aix'):
KNOWN_TCP_OPTS.remove('TCP_MAXSEG')
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
__all__ = (
'LINUX_VERSION',
'SOL_TCP',
'KNOWN_TCP_OPTS',
)
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