Python Standard Library

Module select

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Module select

This module supports asynchronous I/O on multiple file descriptors.

*** IMPORTANT NOTICE *** On Windows and OpenVMS, only sockets are supported; on Unix, all file descriptors.

Classes [hide private]

error

Functions [hide private]

poll(...)
Returns a polling object, which supports registering and unregistering file descriptors, and then polling them for I/O events.

(rlist, wlist, xlist)

select(rlist, wlist, xlist, timeout=...)
Wait until one or more file descriptors are ready for some kind of I/O.

Variables [hide private]

POLLERR = 8 POLLHUP = 16 POLLIN = 1 POLLMSG = 1024 POLLNVAL = 32 POLLOUT = 4 POLLPRI = 2 POLLRDBAND = 128 POLLRDNORM = 64 POLLWRBAND = 512 POLLWRNORM = 256

Function Details [hide private]

select(rlist, wlist, xlist, timeout=...)

Wait until one or more file descriptors are ready for some kind of I/O. The first three arguments are sequences of file descriptors to be waited for: rlist -- wait until ready for reading wlist -- wait until ready for writing xlist -- wait for an ``exceptional condition'' If only one kind of condition is required, pass [] for the other lists. A file descriptor is either a socket or file object, or a small integer gotten from a fileno() method call on one of those.

The optional 4th argument specifies a timeout in seconds; it may be a floating point number to specify fractions of seconds. If it is absent or None, the call will never time out.

The return value is a tuple of three lists corresponding to the first three arguments; each contains the subset of the corresponding file descriptors that are ready.

*** IMPORTANT NOTICE *** On Windows and OpenVMS, only sockets are supported; on Unix, all file descriptors.

Returns: (rlist, wlist, xlist)

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Python Standard Library

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