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This is going to be used to facilitate debugging, and eliminate some
inconveniences around these things. We plan to move the pipe functions
to use these directly, hopefully moving away from the pipe_getopt hack.
(The transport API will need to grow these. For now this is just the
streams.)
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This involved test-specific hacks, since connect() for UNIX domain
sockets always completes synchronously one way or the other, even though
it is documented that it might not. This found a bug, with an uninitialized
poll FD as well!
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This change moves the posix pollers to inline the PFD and makes
the callbacks constant, so that we can dispense with tests, failures,
and locks. It is anticipated that this will reduce lock based
pressure on the bus and increase performance modestly.
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fixes #1326 Linux IPC could use fchmod
fixes #1327 getsockname on ipc may not work
This introduces an abstract:// style transport, which on Linux
results in using the abstract socket with the given name (not
including the leading NULL byte). A new NNG_AF_ABSTRACT is
provided. Auto bind abstract sockets are also supported.
While here we have inlined the aios for the POSIX ipc pipe
objects, eliminating at least one set of failure paths, and
have also performed various other cleanups.
A unix:// alias is available on POSIX systems, which acts just
like ipc:// (and is fact just an alias). This is supplied so
that in the future we can add support for AF_UNIX on Windows.
We've also absorbed the ipcperms test into the new ipc_test suite.
Finally we are now enforcing that IPC path names on Windows are
not over the maximum size, rather than just silently truncating
them.
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We reap the connections when closing, to ensure that the clean up is
done outside the pollq thread. This also reduces pressure on the
pollq, we think. But more importantly it eliminates some complex
code that was meant to avoid deadlocks, but ultimately created other
use-after-free challenges. This work is an enabler for further
simplifications in the aio/task logic. While here we converted some
potentially racy locking of the dialers and reference counts to simpler
lock-free reference counting.
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This reference counts both TCP and IPC dialers running on POSIX
configurations, as we need to take care not to destroy the dialer
until any streams associated with are completely destroyed.
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This is a major change, and includes changes to use a polymorphic
stream API for all transports. There have been related bugs fixed
along the way. Additionally the man pages have changed.
The old non-polymorphic APIs are removed now. This is a breaking
change, but the old APIs were never part of any released public API.
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This also makes some smaller related changes to use the new
nni_type instead of nni_opt_type.
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fixes #596 POSIX IPC should move away from pipedesc/epdesc
fixes #598 TLS and TCP listeners could support NNG_OPT_LOCADDR
fixes #594 Windows IPC should use "new style" win_io code.
fixes #597 macOS could support PEER PID
This large change set cleans up the IPC support on Windows and
POSIX. This has the beneficial impact of significantly reducing
the complexity of the code, reducing locking, increasing
concurrency (multiple dial and accepts can be outstanding now),
reducing context switches (we complete thins synchronously now).
While here we have added some missing option support, and fixed a
few more bugs that we found in the TCP code changes from last week.
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