async_connect sometimes returns succes in case of error

[Gennady Proskurin <gpr@…>]

When listen queue of unix local socket is overflowed, connect() syscall returns EAGAIN, asio does not treat this as error and returns success to async_connect handler.

Reproduced on the following system: Linux maildesk-test 2.6.32-5-amd64 #1 SMP Tue Jun 14 09:42:28 UTC 2011 x86_64 GNU/Linux.

Test program attached, it tries to do write() after successful connect.

[chris_kohlhoff]

(In [76430]) On linux, connect can return EAGAIN in certain circumstances. Remap to another error so that it doesn't look like a non-blocking operation. Refs #6048.

[chris_kohlhoff]

(In [76516]) Merge from trunk:

• Chrono support.

• Added object_handle support.

• Need to enable the basic_handle class when object_handle is supported.

• Update copyright notices.

• Fix MSVC "performance warning".

• Fix for NetBSD. Fixes #6098.

• Fix regression in buffered_write_stream. Fixes #6310.

• Fix deadlock on Mac OS X. Fixes #6275.

• On linux, connect can return EAGAIN in certain circumstances. Remap to another error so that it doesn't look like a non-blocking operation. Fixes #6048.

• Fix non-paged pool "leak" on Windows when io_service is repeatedly run without anything to do. Fixes #6321.

• Disable object_handle on Windows CE.

• Add extra include required for OVERLAPPED struct.

• Fix doxygen comments.

• Update documentation.

• Add missing class.

• Update copyright year.