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help me about sending file through socket udp with c in linux

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# 1  
Old 08-18-2010
help me about sending file through socket udp with c in linux
hi, i am newbie of socket. i want to ask some question. if i want to send file from client to server, how do i do? and if i want to send file from server to client, how do i do?
any pro help me and if possible, you can post code for an example
i need it very much
thank you for helping meSmilie
Y!M: tran_thanh_tung_196
Last edited by tung1984; 08-19-2010 at 12:11 AM..
# 2  
Old 08-19-2010
Your question doesn't make much sense. Doing this in TCP is relatively straightforward -- you connect to somewhere, then just write() and read() and expect the data to arrive the same way you sent it. UDP doesn't do that. It sends plain unadorned packets without any connection. To send a stream in UDP you have to figure out a way to manage lots of things that TCP would do for you, like:
  • Connections -- What do you send to your server in order to tell it to send a file? How do you tell it to stop?
  • Packets -- In TCP you can send as much as you want at a time and the socket handles the rest. UDP only lets you send about a kilobyte at once at most. Your file will have to be broken into bits and sent individually.
  • Ordering -- packets sent over UDP aren't guaranteed to arrive in the order you sent. You'll need to add extra data to each telling which packet they are. If you receive any in the wrong order, you'll need to hang onto them until you get the missing pieces.
  • Errors -- TCP automatically retries for you when things get lost, UDP doesn't. You'll need a way to ask the sender to resend a packet if you don't get it in a reasonable amount of time.
  • Flow control -- TCP waits for the receiver to be ready to deal with new data so it doesn't get overflowed with data it's not ready for. UDP doesn't have this kind of control: You have to handle that yourself.
There's no small example because it's not a small question. What it means is writing your own stream sockets from scratch.

Take a look at UDP Cast if you like, it sends a stream over UDP handling flow control and retransmission and the like.
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