How to write data to a socket

pkprince

I wrote a udp server program. In some cases, the server needs to write data into the socket itself.
I tried, write (sockfd, data, 10) directly; it doesn't work, the system prompts Destination address required
Unless the server simulates the client to connect to itself, and then can write data, is there a simpler way?

langr20002

Can be written, that is, write / send, it is estimated that there is a problem with your code

pkprince

The situation you said is the method often used by the udp client.
Bind the socket and struct sockaddr_in with connect () beforehand,
This can be done without using sendto, write () or send () directly without problems,
But mine is server-side, not work

wizardjinx

socket is an interface after encapsulating the protocol
He provides just a few function interfaces for you to use
According to a series of descriptions he provided
Determine if the return is correct
Confirm that the connection is set up correctly

pkprince

In other words, can the server internally write data to the socket without going through the network (too much trouble)?

pkprince

In other words, can the server internally write data to its socket without going through the network (too much trouble)?

better

server:
    recv (pkt)
    packet_dispatch (pkt)

So you can call packet_dispatch?

orangedj

sendto, can you fill in the address yourself?

pepe0209

The first is whether the server can answer, and then the data you write is consistent with what the server requires. Using sendto or send can definitely send the data out, you try again.

pkprince

Thank you several brothers upstairs! !!
tobetter:
Do not understand what you mean? Can you say more in detail.