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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017, 2018 Mattias Andrée (maandree@kth.se)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
class Random:
'''
Entropy pool status
@variable poolsize:int The size of the entropy pool, see `man 4 random` for more information
@variable read_wakeup_threshold:int The number of bits of entropy required for waking up processes
that sleep waiting for entropy from `/dev/random`
@variable write_wakeup_threshold:int The number of bits of entropy below which we wake up processes
that do a `select` or `poll` for write access to `/dev/random`
@variable urandom_min_reseed_secs:int The minimum number of seconds between urandom pool reseeding
@variable boot_id:int Random UUID generated when the system is booted
'''
def __init__(self):
'''
Constructor
'''
def read(filename):
with open('/proc/sys/kernel/random/' + filename, 'rb') as file:
return file.read().decode('utf-8', 'replace').rstrip('\n')
self.poolsize = int(read('poolsize'))
self.read_wakeup_threshold = int(read('read_wakeup_threshold'))
self.write_wakeup_threshold = int(read('write_wakeup_threshold'))
self.urandom_min_reseed_secs = int(read('urandom_min_reseed_secs'))
self.boot_id = read('boot_id')
def entropy_avail(self):
'''
Get the number of bits available in the entropy pool.
Note that `poolsize` is in bytes on Linux<2.6.
@return :int The number of bits available in the entropy pool
'''
with open('/proc/sys/kernel/random/entropy_avail', 'rb') as file:
return int(file.read().decode('utf-8', 'replace').rstrip('\n'))
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