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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _check_cmdline(data):
    '''
    In some cases where there are an insane number of processes being created
    on a system a PID can get recycled or assigned to a non-Salt process.
    On Linux this fn checks to make sure the PID we are checking on is actually
    a Salt process.

    For non-Linux systems we punt and just return True
    '''
    if not salt.utils.platform.is_linux():
        return True
    pid = data.get('pid')
    if not pid:
        return False
    if not os.path.isdir('/proc'):
        return True
    path = os.path.join('/proc/{0}/cmdline'.format(pid))
    if not os.path.isfile(path):
        return False
    try:
        with salt.utils.files.fopen(path, 'rb') as fp_:
            if b'salt' in fp_.read():
                return True
    except (OSError, IOError):
        return False