FIN flag is set to terminate a TCP session, similarly SYN flag is set to indicate beginning of a TCP transmission. So stream tear-down is initiated as soon as receiver gets a packet with FIN flag set to 1. Though there are some intricacy and variation of it. http://www.fluffyspider.com/resources/papers/TTCPIMG00011.GIF http://www.fluffyspider.com/resources/papers/t_tcp.html On Sun, Mar 24, 2013 at 8:59 AM, ishare <june.tune.sea@xxxxxxxxx> wrote: > On Sat, Mar 23, 2013 at 02:31:18PM +0100, Kristof Provost wrote: >> On 2013-03-22 21:30:08 (+0800), ishare <june.tune.sea@xxxxxxxxx> wrote: >> > If I send a buffer with tcp protocol , the data is separated to serveral packets , >> > each packet will have a seq number with it ,which ensures the recipient read this buffer >> > in right orfer . >> > >> > my question is : how the recipient know which is the end packet of this queue ? Is there >> > data indicate the total quantity of packets composing this buffer ? >> > >> TCP is a stream protocol. There is no concept (at the application level >> anyway) of packets in TCP. The receiving TCP/IP stack is free to offer >> the data to the application whenever it decides to, in however many >> lumps as it decides to. Similarly, the sending TCP/IP stack may decide >> to wait to send data until it's received more from the sending >> application before packaging it and sending it to the receiver. > > When one send system api is called , will all data in the buffer > be sent out together at one time ? > > >> >> You may find http://en.wikipedia.org/wiki/Nagle%27s_algorithm >> interesting. >> >> Regards, >> Kristof >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-newbie" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.linux-learn.org/faqs -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
