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# -*- test-case-name: twisted.test.test_fdesc -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Utility functions for dealing with POSIX file descriptors. """ import errno import os try: import fcntl as _fcntl except ImportError: fcntl = None else: fcntl = _fcntl # twisted imports from twisted.internet.main import CONNECTION_DONE, CONNECTION_LOST def setNonBlocking(fd): """ Set the file description of the given file descriptor to non-blocking. """ flags = fcntl.fcntl(fd, fcntl.F_GETFL) flags = flags | os.O_NONBLOCK fcntl.fcntl(fd, fcntl.F_SETFL, flags) def setBlocking(fd): """ Set the file description of the given file descriptor to blocking. """ flags = fcntl.fcntl(fd, fcntl.F_GETFL) flags = flags & ~os.O_NONBLOCK fcntl.fcntl(fd, fcntl.F_SETFL, flags) if fcntl is None: # fcntl isn't available on Windows. By default, handles aren't # inherited on Windows, so we can do nothing here. _setCloseOnExec = _unsetCloseOnExec = lambda fd: None else: def _setCloseOnExec(fd): """ Make a file descriptor close-on-exec. """ flags = fcntl.fcntl(fd, fcntl.F_GETFD) flags = flags | fcntl.FD_CLOEXEC fcntl.fcntl(fd, fcntl.F_SETFD, flags) def _unsetCloseOnExec(fd): """ Make a file descriptor close-on-exec. """ flags = fcntl.fcntl(fd, fcntl.F_GETFD) flags = flags & ~fcntl.FD_CLOEXEC fcntl.fcntl(fd, fcntl.F_SETFD, flags) def readFromFD(fd, callback): """ Read from file descriptor, calling callback with resulting data. If successful, call 'callback' with a single argument: the resulting data. Returns same thing FileDescriptor.doRead would: CONNECTION_LOST, CONNECTION_DONE, or None. @type fd: C{int} @param fd: non-blocking file descriptor to be read from. @param callback: a callable which accepts a single argument. If data is read from the file descriptor it will be called with this data. Handling exceptions from calling the callback is up to the caller. Note that if the descriptor is still connected but no data is read, None will be returned but callback will not be called. @return: CONNECTION_LOST on error, CONNECTION_DONE when fd is closed, otherwise None. """ try: output = os.read(fd, 8192) except OSError as ioe: if ioe.args[0] in (errno.EAGAIN, errno.EINTR): return else: return CONNECTION_LOST if not output: return CONNECTION_DONE callback(output) def writeToFD(fd, data): """ Write data to file descriptor. Returns same thing FileDescriptor.writeSomeData would. @type fd: C{int} @param fd: non-blocking file descriptor to be written to. @type data: C{str} or C{buffer} @param data: bytes to write to fd. @return: number of bytes written, or CONNECTION_LOST. """ try: return os.write(fd, data) except OSError as io: if io.errno in (errno.EAGAIN, errno.EINTR): return 0 return CONNECTION_LOST __all__ = ["setNonBlocking", "setBlocking", "readFromFD", "writeToFD"]