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|
"""
An RPython implementation of select.poll() based on rffi.
Note that this is not a drop-in replacement: the interface is
simplified - instead of a polling object there is only a poll()
function that directly takes a dictionary as argument.
"""
from errno import EINTR
from rpython.rlib import _rsocket_rffi as _c
from rpython.rlib.rarithmetic import r_uint
from rpython.rtyper.lltypesystem import lltype, rffi
# ____________________________________________________________
# events
#
eventnames = '''POLLIN POLLPRI POLLOUT POLLERR POLLHUP POLLNVAL
POLLRDNORM POLLRDBAND POLLWRNORM POLLWEBAND POLLMSG
FD_SETSIZE'''.split()
eventnames = [name for name in eventnames
if _c.constants.get(name) is not None]
for name in eventnames:
globals()[name] = _c.constants[name]
class PollError(Exception):
def __init__(self, errno):
self.errno = errno
def get_msg(self):
return _c.socket_strerror_str(self.errno)
class SelectError(Exception):
def __init__(self, errno):
self.errno = errno
def get_msg(self):
return _c.socket_strerror_str(self.errno)
# ____________________________________________________________
# poll() for POSIX systems
#
if hasattr(_c, 'poll'):
def poll(fddict, timeout=-1):
"""'fddict' maps file descriptors to interesting events.
'timeout' is an integer in milliseconds, and NOT a float
number of seconds, but it's the same in CPython. Use -1 for infinite.
Returns a list [(fd, events)].
"""
numfd = len(fddict)
pollfds = lltype.malloc(_c.pollfdarray, numfd, flavor='raw')
try:
i = 0
for fd, events in fddict.iteritems():
rffi.setintfield(pollfds[i], 'c_fd', fd)
rffi.setintfield(pollfds[i], 'c_events', events)
i += 1
assert i == numfd
ret = _c.poll(pollfds, numfd, timeout)
if ret < 0:
raise PollError(_c.geterrno())
retval = []
for i in range(numfd):
pollfd = pollfds[i]
fd = rffi.cast(lltype.Signed, pollfd.c_fd)
revents = rffi.cast(lltype.Signed, pollfd.c_revents)
if revents:
retval.append((fd, revents))
finally:
lltype.free(pollfds, flavor='raw')
return retval
def select(inl, outl, excl, timeout=-1.0, handle_eintr=False):
nfds = 0
if inl:
ll_inl = lltype.malloc(_c.fd_set.TO, flavor='raw')
_c.FD_ZERO(ll_inl)
for i in inl:
_c.FD_SET(i, ll_inl)
if i > nfds:
nfds = i
else:
ll_inl = lltype.nullptr(_c.fd_set.TO)
if outl:
ll_outl = lltype.malloc(_c.fd_set.TO, flavor='raw')
_c.FD_ZERO(ll_outl)
for i in outl:
_c.FD_SET(i, ll_outl)
if i > nfds:
nfds = i
else:
ll_outl = lltype.nullptr(_c.fd_set.TO)
if excl:
ll_excl = lltype.malloc(_c.fd_set.TO, flavor='raw')
_c.FD_ZERO(ll_excl)
for i in excl:
_c.FD_SET(i, ll_excl)
if i > nfds:
nfds = i
else:
ll_excl = lltype.nullptr(_c.fd_set.TO)
if timeout < 0:
ll_timeval = lltype.nullptr(_c.timeval)
while True:
res = _c.select(nfds + 1, ll_inl, ll_outl, ll_excl, ll_timeval)
if not handle_eintr or res >= 0 or _c.geterrno() != EINTR:
break
else:
sec = int(timeout)
usec = int((timeout - sec) * 10**6)
ll_timeval = rffi.make(_c.timeval)
rffi.setintfield(ll_timeval, 'c_tv_sec', sec)
rffi.setintfield(ll_timeval, 'c_tv_usec', usec)
res = _c.select(nfds + 1, ll_inl, ll_outl, ll_excl, ll_timeval)
if handle_eintr and res < 0 and _c.geterrno() == EINTR:
res = 0 # interrupted, act as timed out
try:
if res == -1:
raise SelectError(_c.geterrno())
if res == 0:
return ([], [], [])
else:
return (
[i for i in inl if _c.FD_ISSET(i, ll_inl)],
[i for i in outl if _c.FD_ISSET(i, ll_outl)],
[i for i in excl if _c.FD_ISSET(i, ll_excl)])
finally:
if ll_inl:
lltype.free(ll_inl, flavor='raw')
if ll_outl:
lltype.free(ll_outl, flavor='raw')
if ll_excl:
lltype.free(ll_excl, flavor='raw')
if ll_timeval:
lltype.free(ll_timeval, flavor='raw')
# ____________________________________________________________
# poll() for Win32
#
if hasattr(_c, 'WSAEventSelect'):
# WSAWaitForMultipleEvents is broken. If you wish to try it,
# rename the function to poll() and run test_exchange in test_rpoll
def _poll(fddict, timeout=-1):
"""'fddict' maps file descriptors to interesting events.
'timeout' is an integer in milliseconds, and NOT a float
number of seconds, but it's the same in CPython. Use -1 for infinite.
Returns a list [(fd, events)].
"""
numfd = len(fddict)
numevents = 0
socketevents = lltype.malloc(_c.WSAEVENT_ARRAY, numfd, flavor='raw')
try:
eventdict = {}
for fd, events in fddict.iteritems():
# select desired events
wsaEvents = 0
if events & _c.POLLIN:
wsaEvents |= _c.FD_READ | _c.FD_ACCEPT | _c.FD_CLOSE
if events & _c.POLLOUT:
wsaEvents |= _c.FD_WRITE | _c.FD_CONNECT | _c.FD_CLOSE
# if no events then ignore socket
if wsaEvents == 0:
continue
# select socket for desired events
event = _c.WSACreateEvent()
if _c.WSAEventSelect(fd, event, wsaEvents) != 0:
raise PollError(_c.geterrno())
eventdict[fd] = event
socketevents[numevents] = event
numevents += 1
assert numevents <= numfd
# if no sockets then return immediately
# XXX commented out by arigo - we just want to sleep for
# 'timeout' milliseconds in this case, which is what
# I hope WSAWaitForMultipleEvents will do, no?
#if numevents == 0:
# return []
# prepare timeout
if timeout < 0:
timeout = _c.INFINITE
# XXX does not correctly report write status of a port
ret = _c.WSAWaitForMultipleEvents(numevents, socketevents,
False, timeout, False)
if ret == _c.WSA_WAIT_TIMEOUT:
return []
if ret == r_uint(_c.WSA_WAIT_FAILED):
raise PollError(_c.geterrno())
retval = []
info = rffi.make(_c.WSANETWORKEVENTS)
for fd, event in eventdict.iteritems():
if _c.WSAEnumNetworkEvents(fd, event, info) < 0:
continue
revents = 0
if info.c_lNetworkEvents & _c.FD_READ:
revents |= _c.POLLIN
if info.c_lNetworkEvents & _c.FD_ACCEPT:
revents |= _c.POLLIN
if info.c_lNetworkEvents & _c.FD_WRITE:
revents |= _c.POLLOUT
if info.c_lNetworkEvents & _c.FD_CONNECT:
if info.c_iErrorCode[_c.FD_CONNECT_BIT]:
revents |= _c.POLLERR
else:
revents |= _c.POLLOUT
if info.c_lNetworkEvents & _c.FD_CLOSE:
if info.c_iErrorCode[_c.FD_CLOSE_BIT]:
revents |= _c.POLLERR
else:
if fddict[fd] & _c.POLLIN:
revents |= _c.POLLIN
if fddict[fd] & _c.POLLOUT:
revents |= _c.POLLOUT
if revents:
retval.append((fd, revents))
lltype.free(info, flavor='raw')
finally:
for fd, event in eventdict.iteritems():
_c.WSAEventSelect(fd, event, 0)
_c.WSACloseEvent(event)
lltype.free(socketevents, flavor='raw')
return retval
|
