# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
import os
import errno
PID_FILE = '/var/run/lvestats.pid'
RUNNING = 0
STOPPED = 1
DEAD = 2
status_description = {
RUNNING: "Server is running",
STOPPED: "Server is not running, Use 'service lvestats start' command to start it",
DEAD: "lvestats server is dead but pid file exists. Use 'service lvestats restart' command to restart it"
}
def check_server_status():
"""
Read pid from file. If file is not exists, then server is stopped
Send kill signal 0 to check if process exists.
Return status.
From http://linux.die.net/man/2/kill :
"If sig is 0, then no signal is sent, but error checking is still performed;
this can be used to check for the existence of a process ID or process group ID."
errno.ESRCH == "No such process"
:return:
"""
try:
with open(PID_FILE, encoding='utf-8') as pid_file:
pid = pid_file.readline().strip()
except (IOError, OSError):
return STOPPED
else:
try:
os.kill(int(pid), 0)
except OSError as e:
if e.errno == errno.ESRCH:
return DEAD
return RUNNING
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