33 lines
982 B
Python
33 lines
982 B
Python
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# Low level unix utility functions
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#
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# Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import os, pty, fcntl, termios, signal
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# Return the SIGINT interrupt handler back to the OS default
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def fix_sigint():
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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fix_sigint()
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# Set a file-descriptor as non-blocking
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def set_nonblock(fd):
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fcntl.fcntl(fd, fcntl.F_SETFL
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, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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# Support for creating a pseudo-tty for emulating a serial port
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def create_pty(ptyname):
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mfd, sfd = pty.openpty()
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try:
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os.unlink(ptyname)
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except os.error:
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pass
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os.symlink(os.ttyname(sfd), ptyname)
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fcntl.fcntl(mfd, fcntl.F_SETFL
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, fcntl.fcntl(mfd, fcntl.F_GETFL) | os.O_NONBLOCK)
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old = termios.tcgetattr(mfd)
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old[3] = old[3] & ~termios.ECHO
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termios.tcsetattr(mfd, termios.TCSADRAIN, old)
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return mfd
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