Messages in this thread | | | From | Changli Gao <> | Date | Mon, 8 Nov 2010 15:12:00 +0800 | Subject | Re: how to read one udp packet with more than one recvfrom() calls? |
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On Mon, Nov 8, 2010 at 3:08 PM, ranjith kumar <ranjithproxy@gmail.com> wrote: > Hi, > > I have implemented client and server programs using udp > protocol(files are attached). > UDP packet size is 500bytes. > > I want to read these 500bytes in two calls to recvfrom(). First time > reading 100bytes and second time 400bytes. > How to do this? > > When I tried to change the third argument of recvfrom(size_t len), > from 500 to 100, first 100bytes are read correctly. > But when I call recvfrom() second time with len=400, it is reading the > first 400bytes of "next udp packet". > Why? Isn't it possible to read one udp packet in two calls to > recvfrom()/read()???? >
recvmsg(2):
MSG_PEEK This flag causes the receive operation to return data from the beginning of the receive queue without removing that data from the queue. Thus, a subsequent receive call will return the same data.
-- Regards, Changli Gao(xiaosuo@gmail.com) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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