What does it mean when recv returns 0?
What does it mean when recv returns 0?
Upon successful completion, recv() returns the length of the message in bytes. If no messages are available to be received and the peer has performed an orderly shutdown, recv() returns 0. Otherwise, -1 is returned and errno is set to indicate the error.
What does RECV return in C?
Return value If no error occurs, recv returns the number of bytes received and the buffer pointed to by the buf parameter will contain this data received. If the connection has been gracefully closed, the return value is zero.
What is the return value of Recvfrom?
Return value If no error occurs, recvfrom returns the number of bytes received. If the connection has been gracefully closed, the return value is zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.
What is the difference between RECV and Recvfrom?
Unlike the recv() call, which can only be used on a connected stream socket or bound datagram socket, recvfrom() can be used to receive data on a socket whether or not it is connected. If no messages are available at the socket, the recvfrom() call waits for a message to arrive unless the socket is nonblocking.
What does RECV mean?
RECV
| Acronym | Definition |
|---|---|
| RECV | Received |
| RECV | Receive |
| RECV | Resident Evil Code Veronica (game) |
How does send and recv work?
After your connection is set up, the OS manages the packets entering and leaving your system, the recv() call just reads the packet buffer, and the send() call just queues the packets.
What is Recvfrom in C?
DESCRIPTION. The recvfrom() function shall receive a message from a connection-mode or connectionless-mode socket. It is normally used with connectionless-mode sockets because it permits the application to retrieve the source address of received data.
What does Recvfrom return Python?
UDP sockets use recvfrom to receive data. Its paremeter is the buffer size. The return value is a pair (data, address) where data is a byte string representing the data received and address is the address of the socket sending the data.
How do I stop recvFrom?
Thread off your recvFrom() loop so that your main thread can wait for user input. When user requests stop, close the fd from the main thread and the recvFrom() will return immediately with an error, so allowing your recvFrom() thread to exit.
What does RECV mean in jail?
Is recv blocking calls?
recv(IPC, Buffer, int n) is a blocking call, that is, if data is available it writes it to the buffer and immediately returns true, and if no data is available it waits for at least n seconds to receive any data.
Does recv wait for data?
If no messages are available at the socket, the recv() call waits for a message to arrive unless the socket is nonblocking. If a socket is nonblocking, -1 is returned and the external variable errno is set to EWOULDBLOCK. select() can be used to wait for incoming messages.
