monkey.py 文件源码

def patch_os():
    """
    Replace :func:`os.fork` with :func:`gevent.fork`, and, on POSIX,
    :func:`os.waitpid` with :func:`gevent.os.waitpid` (if the
    environment variable ``GEVENT_NOWAITPID`` is not defined). Does
    nothing if fork is not available.

    This method must be used with :func:`patch_signal` to have proper SIGCHLD
    handling. :func:`patch_all` calls both by default.
    """
    patch_module('os')