I’m having a problem where a TCP socket is listening on a port, and has been working perfectly for a very long time – it’s handled multiple connections, and seems to work flawlessly. However, occasionally when calling accept() to create a new connection the accept() call fails, and I get the following error string from the system:
10022: An invalid argument was supplied.
Apparently this can happen when you call accept() on a socket that is no longer listening, but I have not closed the socket myself, and have not been notified of any errors on that socket.
Can anyone think of any reasons why a listening socket would stop listening, or how the error mentioned above might be generated?
Some possibilities:
Some other part of your code overwrote the handle value. Check to see if it has changed (keep a copy somewhere else and compare, print it out, breakpoint on write in the debugger, whatever).
Something closed the handle.
Interactions with a buggy Winsock LSP.