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Anonymous subs cost over 5K each on x86-64. So prefer the
less-recommended-but-still-documented way of using
Linux::Inotify2::watch to register watchers.
This also updates FakeInotify to detect modifications correctly
when used on systems with neither IO::KQueue nor
Linux::Inotify2.
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This allows callers to avoid creating expensive closures.
We no longer pass the `$now' value to callers, as none of
the callers used it.
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We need to detect link(2) and rename(2) in other apps
writing to the Maildir.
We'll be removing the Filesys::Notify::Simple from -watch
in favor of using IO::KQueue or Linux::Inotify2 directly.
Ensure non-inotify emulations can support everything we
expect for Maildir writers.
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We can fill in some missing pieces from the emulation APIs
to enable IMAP IDLE tests on non-Linux platforms.
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This will be used to implement IMAP IDLE, first.
Eventually, it may be used to trigger other things:
* incremental internal updates for manifest.js.gz
* restart `git cat-file' processes on pack index unlink
* IMAP IDLE-like long-polling HTTP endpoint
And maybe more things we haven't thought of, yet.
It uses Linux::Inotify2 or IO::KQueue depending on what packages
are installed and what the kernel supports. It falls back to
nanosecond-aware Time::HiRes::stat() (available with Perl 5.10.0+)
on systems lacking Linux::Inotify2 and IO::KQueue.
In the future, a pure Perl alternative to Linux::Inotify2 may be
supplied for users of architectures we already support signalfd
and epoll on.
v2 changes:
- avoid O_TRUNC on lock file
- change ctime on Linux systems w/o inotify
- fix naming of comments and fields
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