sockets

问题 I currently have a .NET program initiating a connection to a server and starting another, unmanaged executable. The native process should take over the same socket (it is essential for the connection not to be closed until the termination of the child process!) and start communicating through it with the server. The aforementioned programs run both on Windows, however I'd prefer a solution that does not involve P/Invoke for the .NET part. As a side note, communication from parent to child

问题 I currently have a .NET program initiating a connection to a server and starting another, unmanaged executable. The native process should take over the same socket (it is essential for the connection not to be closed until the termination of the child process!) and start communicating through it with the server. The aforementioned programs run both on Windows, however I'd prefer a solution that does not involve P/Invoke for the .NET part. As a side note, communication from parent to child

问题 I currently have a .NET program initiating a connection to a server and starting another, unmanaged executable. The native process should take over the same socket (it is essential for the connection not to be closed until the termination of the child process!) and start communicating through it with the server. The aforementioned programs run both on Windows, however I'd prefer a solution that does not involve P/Invoke for the .NET part. As a side note, communication from parent to child

问题 EDIT to format: This is the original code from __future__ import print_function import socket import sys def socket_accept(): conn, address = s.accept() print("Connection has been established | " + "IP " + address[0] + "| Port " + str(address[1])) send_commands(conn) conn.close() def send_commands(conn): while True: cmd = raw_input() if cmd == 'quit': conn.close() s.close() sys.exit() if len(str.encode(cmd)) > 0: conn.send(str.encode(cmd)) client_response = str(conn.recv(1024), "utf-8") print

问题 EDIT to format: This is the original code from __future__ import print_function import socket import sys def socket_accept(): conn, address = s.accept() print("Connection has been established | " + "IP " + address[0] + "| Port " + str(address[1])) send_commands(conn) conn.close() def send_commands(conn): while True: cmd = raw_input() if cmd == 'quit': conn.close() s.close() sys.exit() if len(str.encode(cmd)) > 0: conn.send(str.encode(cmd)) client_response = str(conn.recv(1024), "utf-8") print

问题 Why doesn't the recv system call just block until all the data is received? Every time I have seen a recv call, it's in a while loop which just keeps on calling recv until all the data is there. Why not just have recv block in the first place? 回答1: You can request that recv block until all data is received, with the MSG_WAITALL flag. However, if a signal arrives, a system call that has performed some work (ie, receiving part of the data) cannot be automatically restarted to receive the rest.

问题 Why doesn't the recv system call just block until all the data is received? Every time I have seen a recv call, it's in a while loop which just keeps on calling recv until all the data is there. Why not just have recv block in the first place? 回答1: You can request that recv block until all data is received, with the MSG_WAITALL flag. However, if a signal arrives, a system call that has performed some work (ie, receiving part of the data) cannot be automatically restarted to receive the rest.

问题 Why doesn't the recv system call just block until all the data is received? Every time I have seen a recv call, it's in a while loop which just keeps on calling recv until all the data is there. Why not just have recv block in the first place? 回答1: You can request that recv block until all data is received, with the MSG_WAITALL flag. However, if a signal arrives, a system call that has performed some work (ie, receiving part of the data) cannot be automatically restarted to receive the rest.

问题 I believe the shutdown sequence is as follows (as described here): The MSDN documentation (remarks section) reads: When using a connection-oriented Socket , always call the Shutdown method before closing the Socket . This ensures that all data is sent and received on the connected socket before it is closed. This seems to imply that if I use Shutdown(SocketShutdown.Both) , any data that has not yet been received, may still be consumed. To test this: I continuously send data to the client (via

问题 I believe the shutdown sequence is as follows (as described here): The MSDN documentation (remarks section) reads: When using a connection-oriented Socket , always call the Shutdown method before closing the Socket . This ensures that all data is sent and received on the connected socket before it is closed. This seems to imply that if I use Shutdown(SocketShutdown.Both) , any data that has not yet been received, may still be consumed. To test this: I continuously send data to the client (via