Hi, thanks for your answer. Should I just use that object's close()
method? Is it safe to assume that objects that have fileno() also have
close()? (Statically typed interfaces would come in handy now.)
I'm writing a simple asynchronous I/O framework (for learning purposes -
I'm aware of the myriad such frameworks for Python), and I'm writing a
wrapper around objects that can be passed into select.select(). Since
select() requires objects that have fileno's, that's the only
requirement I place on the wrapped object's interface, and thus why I've
been using FD-based operations:
class handle( object ):
'''handle( underlying_file ) -> handle object
A wrapper for a nonblocking file descriptor/handle. Wraps any object
with a fileno() method.'''
__slots__ = [ '_real' ]
# _real is the underlying file handle. Must support fileno().
def __init__( self, real_handle ):
self._real = real_handle
def fileno( self ):
return self._real.fileno()
def close( self ):
close( self._real.fileno() )
# seems that this must now become: self._real.close()
def wait_readable( self ):
...
"js " <[EMAIL PROTECTED]> wrote in
news:[EMAIL PROTECTED]:
> Hello, Yang.
>
> You're not supposed to use os.open there.
> See the doc at http://docs.python.org/lib/os-fd-ops.html
>
> Is there any reason you want to use os.close?
>
> On 20 May 2007 04:26:12 GMT, Yang
> <[EMAIL PROTECTED]> wrote:
>> Hi, I'm experiencing a problem when trying to close the file
descriptor
>> for a socket, creating another socket, and then closing the file
>> descriptor for that second socket. I can't tell if my issue is about
>> Python or POSIX.
>>
>> In the following, the first time through, everything works. On the
>> second connection, though, the same file descriptor as the first
>> connection may be re-used, but for some reason, trying to do
>> os.read/close on that file descriptor will cause an error.
>>
>> Thanks in advance for any help on why this problem is occurring
and/or
>> how to resolve it (preferrably, I can continue to use file
descriptors
>> instead of resorting to socket.recv/socket.close).
>>
>> def handle( s ):
>> print id(s), s
>> print os.read( s.fileno(), 4096 ) # s.recv(4096)
>> os.close( s.fileno() ) # s.close()
>> svr = socket.socket()
>> svr.bind( ( 'localhost', 8003 ) )
>> svr.listen( 1 )
>> while True:
>> print 'accepting'
>> s,_ = svr.accept()
>> handle( s )
>>
>> # Traceback (most recent call last):
>> # File "./normal_server_close_error.py", line 25, in <module>
>> # handle( s )
>> # File "./normal_server_close_error.py", line 13, in handle
>> # print os.read( s.fileno(), 4096 ) # s.recv(4096)
>> # OSError: [Errno 9] Bad file descriptor
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
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