Re: send and looping

From: David Stevens (dlstevens@us.ibm.com)
Date: Wed Feb 05 2003 - 17:03:14 EST


With a non-blocking socket, if there is space in the local TCP send buffer,
but the current send is more than the available space in the local send
buffer, it should put a portion of it and return a count equal to that
(that is, less than the total buffer you passed to send).

With a blocking socket (that is, you haven't set non-blocking), it should
block until there is send buffer space for the entire buffer on the current
send.

                        +-DLS

thomas joseph <thomascanny@yahoo.co.nz>@vger.kernel.org on 02/04/2003
09:13:15 PM

Sent by: linux-net-owner@vger.kernel.org

To: linux-net@vger.kernel.org
cc:
Subject: send and looping

Hi All,

I ahve a small question on using send with sockets.
On normal circumstances can I assume that "send always
sends specified bytes completely" or Do I need to
check for the return value and continue looping till
I send the complete data.

 The man pgaes of send say that send normally blocks
 when there is no buffer space left. But the man
 pages of select_tut say that "send" is not assured
of
 sending the complete data.

 Can somebody suggestme on what approach do I need to
take. Hope this is the right place to ask this
question.

 Thanks and Regards,
 --thomas

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