#!/usr/bin/python
# --*-- coding:utf-8 --*--

"""
@File:fileprocess.py
@Author: xianqc
@Date:2020/11/17 2020/11/17 
"""
import psutil
import subprocess
import errno
import os
import time

def startprocess(cmdline):
    try:
        ps = subprocess.Popen(cmdline, shell=False)
        time.sleep(2)
        return ps.pid
    #except WindowsError as err:
    except:
        return None
    return None

def pid_exists(pid):
    """Check whether pid exists in the current process table.
    UNIX only.
    """
    if pid < 0:
        return False
    if pid == 0:
        # According to "man 2 kill" PID 0 refers to every process
        # in the process group of the calling process.
        # On certain systems 0 is a valid PID but we have no way
        # to know that in a portable fashion.
        raise ValueError('invalid PID 0')
    try:
        os.kill(pid, 0)
    except OSError as err:
        if err.errno == errno.ESRCH:
            # ESRCH == No such process
            return False
        elif err.errno == errno.EPERM:
            # EPERM clearly means there's a process to deny access to
            return True
        else:
            # According to "man 2 kill" possible error values are
            # (EINVAL, EPERM, ESRCH)
            raise
    else:
        return True

def checkprocess(processname):
    pl = psutil.pids()
    for pid in pl:
        try:
            if psutil.Process(pid).name() == processname:
                return True
        except:
            continue
    return False

def getprocess(processname):
    pl = psutil.pids()
    for pid in pl:
        try:
            if psutil.Process(pid).name() == processname:
                return pid
        except:
            continue
    return None

def checkfile(filepath):
    if not os.path.isfile(filepath):
        return False
    if os.path.exists(filepath):
        return True
    return False

if __name__ == '__main__':
   print(startprocess('E:\\state\\tools\\blacklist\\UltraISO.exe'))
   print(checkprocess('UltraISO.exe'))
   print(checkfile('E:\\state\\tools\\blacklist\\UltraISO.exe'))
   print(startprocess('E:\\state\\tools\\wormvir\\serotonin.exe'))
   print(checkprocess('serotonin.exe'))
   print(checkfile('E:\\state\\tools\\wormvir\\serotonin.exe'))