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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 Files:
'''
Data from /proc/sys/fs/file-nr
@variable nr_files:int The number of allocated file handles, i.e.,
the number of files presently opened
@variable nr_free_files:int The number of free file handles
@variable file_max:int The maximum number of file handles
If the number of allocated file handles is close to the maximum,
you should consider increasing the maximum. Before Linux 2.6, the
kernel allocated file handles dynamically, but it didn't free them
again. Instead the free file handles were kept in a list for
reallocation; the "free file handles" value indicates the size of
that list. A large number of free file handles indicates that there
was a past peak in the usage of open file handles. Since Linux 2.6,
the kernel does deallocate freed file handles, and the "free file
handles" value is always zero.
'''
def __init__(self):
'''
Constructor
'''
state = None
with open('/proc/sys/fs/file-nr', 'rb') as file:
state = file.read()
state = state.decode('utf-8', 'replace').replace('\t', ' ')
state = [int(field) for field in state.split(' ') if not field == '']
(self.nr_files, self.nr_free_files, self.file_max) = state
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