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'''This is like :mod:`pexpect`, but it will work with any file descriptor that you pass it. You are responsible for opening and close the file descriptor. This allows you to use Pexpect with sockets and named pipes (FIFOs). .. note:: socket.fileno() does not give a readable file descriptor on windows. Use :mod:`pexpect.socket_pexpect` for cross-platform socket support PEXPECT LICENSE This license is approved by the OSI and FSF as GPL-compatible. http://opensource.org/licenses/isc-license.txt Copyright (c) 2012, Noah Spurrier <noah@noah.org> PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ''' from .spawnbase import SpawnBase from .exceptions import ExceptionPexpect, TIMEOUT from .utils import select_ignore_interrupts, poll_ignore_interrupts import os __all__ = ['fdspawn'] class fdspawn(SpawnBase): '''This is like pexpect.spawn but allows you to supply your own open file descriptor. For example, you could use it to read through a file looking for patterns, or to control a modem or serial device. ''' def __init__ (self, fd, args=None, timeout=30, maxread=2000, searchwindowsize=None, logfile=None, encoding=None, codec_errors='strict', use_poll=False): '''This takes a file descriptor (an int) or an object that support the fileno() method (returning an int). All Python file-like objects support fileno(). ''' if type(fd) != type(0) and hasattr(fd, 'fileno'): fd = fd.fileno() if type(fd) != type(0): raise ExceptionPexpect('The fd argument is not an int. If this is a command string then maybe you want to use pexpect.spawn.') try: # make sure fd is a valid file descriptor os.fstat(fd) except OSError: raise ExceptionPexpect('The fd argument is not a valid file descriptor.') self.args = None self.command = None SpawnBase.__init__(self, timeout, maxread, searchwindowsize, logfile, encoding=encoding, codec_errors=codec_errors) self.child_fd = fd self.own_fd = False self.closed = False self.name = '<file descriptor %d>' % fd self.use_poll = use_poll def close (self): """Close the file descriptor. Calling this method a second time does nothing, but if the file descriptor was closed elsewhere, :class:`OSError` will be raised. """ if self.child_fd == -1: return self.flush() os.close(self.child_fd) self.child_fd = -1 self.closed = True def isalive (self): '''This checks if the file descriptor is still valid. If :func:`os.fstat` does not raise an exception then we assume it is alive. ''' if self.child_fd == -1: return False try: os.fstat(self.child_fd) return True except: return False def terminate (self, force=False): # pragma: no cover '''Deprecated and invalid. Just raises an exception.''' raise ExceptionPexpect('This method is not valid for file descriptors.') # These four methods are left around for backwards compatibility, but not # documented as part of fdpexpect. You're encouraged to use os.write # directly. def send(self, s): "Write to fd, return number of bytes written" s = self._coerce_send_string(s) self._log(s, 'send') b = self._encoder.encode(s, final=False) return os.write(self.child_fd, b) def sendline(self, s): "Write to fd with trailing newline, return number of bytes written" s = self._coerce_send_string(s) return self.send(s + self.linesep) def write(self, s): "Write to fd, return None" self.send(s) def writelines(self, sequence): "Call self.write() for each item in sequence" for s in sequence: self.write(s) def read_nonblocking(self, size=1, timeout=-1): """ Read from the file descriptor and return the result as a string. The read_nonblocking method of :class:`SpawnBase` assumes that a call to os.read will not block (timeout parameter is ignored). This is not the case for POSIX file-like objects such as sockets and serial ports. Use :func:`select.select`, timeout is implemented conditionally for POSIX systems. :param int size: Read at most *size* bytes. :param int timeout: Wait timeout seconds for file descriptor to be ready to read. When -1 (default), use self.timeout. When 0, poll. :return: String containing the bytes read """ if os.name == 'posix': if timeout == -1: timeout = self.timeout rlist = [self.child_fd] wlist = [] xlist = [] if self.use_poll: rlist = poll_ignore_interrupts(rlist, timeout) else: rlist, wlist, xlist = select_ignore_interrupts( rlist, wlist, xlist, timeout ) if self.child_fd not in rlist: raise TIMEOUT('Timeout exceeded.') return super(fdspawn, self).read_nonblocking(size)