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What happens on buffer overflow?

原文 2012-09-04 18:35:48 0 2 c++/ linux/ sockets/ tcp/ buffer

I read somewhere that every TCP connection has it's own 125kB output and input buffer. What happens if this buffer is full, and I still continue sending data on linux?

According to http://www.kernel.org/doc/man-pages/online/pages/man2/send.2.html the packets are just silently dropped, without notifying me. What can I do to stop this from happening? Is there any way to find out if at least some of my data has been sent correctly, so that I can continue at a later point in time?

2 answers

Short answer is this. "send" calls on a TCP socket will just block until the TCP sliding window (or internal queue buffers) opens up as a result of the remote endpoint receiving and consuming data. It's not much different than trying to write bytes to a file faster than the disk can save it.

If your socket is configured for non-blocking mode, send will return EWOULDBLOCK or EAGAIN, until data can be sent. Standard poll , select , and epoll calls will work as expected so you know when to "send" again.

I don't know that the "packets are dropped". I think that what is more likely is that the calls that the program makes to write() will either block or return a failure.

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Related Question What happens if STDOUT buffer is overflowed What happens in this code? (Executing a char buffer) What happens if strncpy copies random data into a buffer? What happens to the character buffer when my std::string is resized? What happens in boost::asio when TCP TX buffer fills up? What is a buffer overflow and how do I cause one? what is the best way to detect the source of buffer overflow in c++ for windows? What exactly happens when I do buffer1.push_back(buffer2.front()) in C++? buffer overrun happens in SystemTimeToVariantTime Buffer Overflow a Vector

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What happens on buffer overflow?

Question

2 answers

solution1
7 ACCPTED 2012-09-04 18:53:52

solution2
0 2012-09-04 18:38:37

What happens on buffer overflow?

Question

2 answers

solution1 7 ACCPTED 2012-09-04 18:53:52

solution2 0 2012-09-04 18:38:37

solution1
7 ACCPTED 2012-09-04 18:53:52

solution2
0 2012-09-04 18:38:37