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What is the use of "bind()" in TCP socket programming?

+1 vote
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Is it right that it is used to bind Port number with IP?
If it is, then What is the need of binding it? and Why it is not present in UDP?
And also, What is the use of listen(5) ?
Does it mean that server can be connected maximum to 5 client? or it means that if server is busy with other client then 5 more client can be in queue.?
and also, What is the use of select() ?
As far as i know it is used when we want to monitor continuously input/output for that particular file descriptor.
is it correct?
If yes, then why it is used only when accepting connection request from multiple client.?

posted Jun 5, 2015 by anonymous

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1 Answer

+1 vote

Bind function "binds" a socket to an address, otherwise it doesn't know what address (ip-address/port pair) it should listen to.

It is not correct that we dont need to bind the UDP socket (Server side needs a bind while client is not). Check this http://www.programminglogic.com/sockets-programming-in-c-using-udp-datagrams/

answer Jun 5, 2015 by Salil Agrawal
Ok, Thanks, Sir
but there are few more questions in comments. can you please help in that?
commented Jun 5, 2015 by Chirag Gangdev
Listen takes two parameters first is the socket ID and second is the length of the buffer which means how many pending connection possible which are not accepted.

PS: Please frame the query clearly so that an unknown person can understand. Its better to ask multiple question for multiple problem so that those are not missed.
commented Jun 5, 2015 by Salil Agrawal
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