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ACE C++ framework Bug 3606 fixed - ACE::handle_ready does not work as expected when waiting for read and write event on a handle

02/23/10

Permalink 09:08:58 pm, by lano1106, 175 words, 2693 views   English (CA)
Categories: TCP/IP, C++

ACE C++ framework Bug 3606 fixed - ACE::handle_ready does not work as expected when waiting for read and write event on a handle

I have submitted a patch for the bugzilla bug 3606:

http://bugzilla.dre.vanderbilt.edu/show_bug.cgi?id=3606

Fix function ACE::handle_ready + SOCK_Test modif to test the fix

The patch include the following:

1. Fix for the bug 3606 in function ACE::handle_ready
2. Modif of the unittest SOCK_Test to validate the fix
3. Removal of the define ACE_HAS_LIMITED_SELECT

There has been a very long thread about it last summer on the ACE mailing list and I was arguing that it was dangerous to use select() when poll() is available because if you pass an handle whose value that is higher than FD_SETSIZE (typically 1024), it causes a buffer overflow on the stack which is hard to debug.

At the end, a consensus emerged that ACE_HAS_LIMITED_SELECT should be removed. Actually if some platform would benefit from that, it would be safer to define ACE_HAS_UNLIMITED_SELECT instead.

4. Remove the duplicated code from ACE::handle_ready() at different locations to replace it with the appropriate ACE namespace function call.

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