os.py 文件源码

def read(fd, n):
    """read(fd, buffersize) -> string

    Read a file descriptor."""
    while True:
        try:
            return __original_read__(fd, n)
        except (OSError, IOError) as e:
            if get_errno(e) != errno.EAGAIN:
                raise
        except socket.error as e:
            if get_errno(e) == errno.EPIPE:
                return ''
            raise
        try:
            hubs.trampoline(fd, read=True)
        except hubs.IOClosed:
            return ''