/usr/share/pyshared/eventlet/green/select.py is in python-eventlet 0.9.16-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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error = __select.error
from eventlet.greenthread import getcurrent
from eventlet.hubs import get_hub
__patched__ = ['select']
def get_fileno(obj):
# The purpose of this function is to exactly replicate
# the behavior of the select module when confronted with
# abnormal filenos; the details are extensively tested in
# the stdlib test/test_select.py.
try:
f = obj.fileno
except AttributeError:
if not isinstance(obj, (int, long)):
raise TypeError("Expected int or long, got " + type(obj))
return obj
else:
rv = f()
if not isinstance(rv, (int, long)):
raise TypeError("Expected int or long, got " + type(rv))
return rv
def select(read_list, write_list, error_list, timeout=None):
# error checking like this is required by the stdlib unit tests
if timeout is not None:
try:
timeout = float(timeout)
except ValueError:
raise TypeError("Expected number for timeout")
hub = get_hub()
t = None
current = getcurrent()
assert hub.greenlet is not current, 'do not call blocking functions from the mainloop'
ds = {}
for r in read_list:
ds[get_fileno(r)] = {'read' : r}
for w in write_list:
ds.setdefault(get_fileno(w), {})['write'] = w
for e in error_list:
ds.setdefault(get_fileno(e), {})['error'] = e
listeners = []
def on_read(d):
original = ds[get_fileno(d)]['read']
current.switch(([original], [], []))
def on_write(d):
original = ds[get_fileno(d)]['write']
current.switch(([], [original], []))
def on_error(d, _err=None):
original = ds[get_fileno(d)]['error']
current.switch(([], [], [original]))
def on_timeout():
current.switch(([], [], []))
if timeout is not None:
t = hub.schedule_call_global(timeout, on_timeout)
try:
for k, v in ds.iteritems():
if v.get('read'):
listeners.append(hub.add(hub.READ, k, on_read))
if v.get('write'):
listeners.append(hub.add(hub.WRITE, k, on_write))
try:
return hub.switch()
finally:
for l in listeners:
hub.remove(l)
finally:
if t is not None:
t.cancel()
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