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 is the return value of recv?
Returned value. If successful, recv() returns the length of the message or datagram in bytes. The value 0 indicates the connection is closed.
Under which of the following circumstances recv () returns a zero value?
recv() definitely returns = 0 when the other side closed the connection.
What is RECV?
RETURN VALUE. Upon successful completion, recv() shall return the length of the message in bytes. If no messages are available to be received and the peer has performed an orderly shutdown, recv() shall return 0. Otherwise, -1 shall be returned and errno set to indicate the error.
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 is recv socket?
the parameter to socket. recv is the maximum length of the message to read at once. It will try to read up to that number, but no more, then return the read value. If you expect to receive more data than that, you can try to recv later on, or wait for more data to be received before calling the recv method. – Martin.
Is recv blocking call?
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.
How do I block RECV?
How can I make it blocking? Unless you are actually requesting 0 bytes be read, then a return value of 0 from recv() means the connection has been gracefully closed by the remote peer. This is documented behavior. You are supposed to STOP READING and close your socket.