Reads at most n bytes from socket
(socket, n=4096)
| 24 | |
| 25 | |
| 26 | def read(socket, n=4096): |
| 27 | """ |
| 28 | Reads at most n bytes from socket |
| 29 | """ |
| 30 | |
| 31 | recoverable_errors = (errno.EINTR, errno.EDEADLK, errno.EWOULDBLOCK) |
| 32 | |
| 33 | if not isinstance(socket, NpipeSocket): |
| 34 | if not hasattr(select, "poll"): |
| 35 | # Limited to 1024 |
| 36 | select.select([socket], [], []) |
| 37 | else: |
| 38 | poll = select.poll() |
| 39 | poll.register(socket, select.POLLIN | select.POLLPRI) |
| 40 | poll.poll() |
| 41 | |
| 42 | try: |
| 43 | if hasattr(socket, 'recv'): |
| 44 | return socket.recv(n) |
| 45 | if isinstance(socket, pysocket.SocketIO): |
| 46 | return socket.read(n) |
| 47 | return os.read(socket.fileno(), n) |
| 48 | except OSError as e: |
| 49 | if e.errno not in recoverable_errors: |
| 50 | raise |
| 51 | except Exception as e: |
| 52 | is_pipe_ended = (isinstance(socket, NpipeSocket) and |
| 53 | len(e.args) > 0 and |
| 54 | e.args[0] == NPIPE_ENDED) |
| 55 | if is_pipe_ended: |
| 56 | # npipes don't support duplex sockets, so we interpret |
| 57 | # a PIPE_ENDED error as a close operation (0-length read). |
| 58 | return '' |
| 59 | raise |
| 60 | |
| 61 | |
| 62 | def read_exactly(socket, n): |
no test coverage detected