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# Low level unix utility functions
#
# Copyright (C) 2016-2020 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import os, pty, fcntl, termios, signal, logging
import traceback
######################################################################
# Low-level Unix commands
######################################################################
# Return the SIGINT interrupt handler back to the OS default
def fix_sigint():
signal.signal(signal.SIGINT, signal.SIG_DFL)
fix_sigint()
# Set a file-descriptor as non-blocking
def set_nonblock(fd):
fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
# Clear HUPCL flag
def clear_hupcl(fd):
attrs = termios.tcgetattr(fd)
attrs[2] = attrs[2] & ~termios.HUPCL
try:
termios.tcsetattr(fd, termios.TCSADRAIN, attrs)
except termios.error:
pass
# Support for creating a pseudo-tty for emulating a serial port
def create_pty(ptyname):
mfd, sfd = pty.openpty()
try:
os.unlink(ptyname)
except os.error:
pass
filename = os.ttyname(sfd)
os.chmod(filename, 0o660)
os.symlink(filename, ptyname)
set_nonblock(mfd)
old = termios.tcgetattr(mfd)
old[3] = old[3] & ~termios.ECHO
termios.tcsetattr(mfd, termios.TCSADRAIN, old)
return mfd
######################################################################
# General system and software information
######################################################################
def get_cpu_info():
try:
f = open("/proc/cpuinfo", "r")
data = f.read()
f.close()
except (IOError, OSError) as e:
logging.debug("Exception on read /proc/cpuinfo: %s", traceback.format_exc())
return "?"
lines = [l.split(":", 1) for l in data.split("\n")]
lines = [(l[0].strip(), l[1].strip()) for l in lines if len(l) == 2]
core_count = [k for k, v in lines].count("processor")
model_name = dict(lines).get("model name", "?")
return "%d core %s" % (core_count, model_name)
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