daemonize.py 文件源码

def __init__(self,
                 pidfile=None,
                 stdin='/dev/null',
                 stdout='/dev/null',
                 stderr='/dev/null',
                 close_fds=False):

        self.stdin = stdin
        self.stdout = stdout
        self.stderr = stderr
        self.pidfile = pidfile or _default_pid_file()
        # NOTE: We need to open another separate file to avoid the file
        #       being reopened again.
        #       In which case, process loses file lock.
        #
        # From "man fcntl":
        # As well as being removed by an explicit F_UNLCK, record locks are
        # automatically released when the process terminates or if it
        # closes any file descriptor referring to a file on which locks
        # are held. This is bad: it means that a process can lose the locks
        # on a file like /etc/passwd or /etc/mtab when for some reason a
        # library function decides to open, read and close it.
        self.lockfile = self.pidfile + ".lock"
        self.lockfp = None
        self.close_fds = close_fds