Consolidate TCP-specific common code into their own files.

The TCP keepalive tuning code has been moved into the newly added
files; this also allows future TCP-specific code to be added into
these files, without bloating the IP level code and establishes a
known file structure for other IP-based transports.

Remember: this is a no-op change, hence no API or functionality
was changed as part of this commit.

Change connection failure test to use an invalid hostname

- invalid hostname set to 0mq.is.the.best (naturally!)
- issue happens as other valid-like non-existent hostnames were
  redirected by buggy Cable/ISP DNS servers

Remove unused variable which causes build to fail with -Werror

Check if SO_NOSIGPIPE is defined

Bumped version for next release (3.3.0)

Fix build on HPUX 11iv3

Fix up build on AIX7

Fix build on RHEL5 and SLES10

The socket length variable for getsockname and accept must be an
(int *) instead of a (socklen_t *) on HPUX.
Signed-off-by: AJ Lewis <aj.lewis@quantum.com>

GCC 4.1.2 on RHEL5 and SLES10 don't like not having a newline at the
end of a source file, and error out if it's missing.
Signed-off-by: AJ Lewis <aj.lewis@quantum.com>

Copy logic from zmq.cpp into device.cpp for getting poll.h included.

Ensure that zmq.h is included *after* poll.h in both zmq.cpp and
device.cpp.
Signed-off-by: AJ Lewis <aj.lewis@quantum.com>

Issue 320 author

Fix Win32 build.

lb: code cleanup

Prevent connection starvation

When removing a pipe from the lb or fq component,
make sure we do not remove another pipe from the active set.

Return error on invalid PGM url instead of raising assertion.

Fix Win32 build.

Fix title on zmq_disconnect manpage.

Fix issue #370

The patch extends the internal session's API with the reset method.
This method is used to reset a session's state so that it can
handle a new connection.

Code cleanup

Fix issue #369

The bug was that after reconnect, the session did not
handle identity messages properly.

Fixed zmq_poll.txt manpage for issue #361

Code cleanup