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Unfortunately, I'm not sure how easy catching these at
compile-time, is. Prototypes do not seem to check these
at compile time when crossing packages (not even with
exported subroutines).
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And avoid unnecessary POD markup in the man page.
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Sometimes it may not be apparent when/if a signal is
processed, this hopefully improves the situation.
We'll also change the process title when we're quitting
to better inform users.
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This is no longer limited to Maildirs now that IMAP and NNTP
support exist; so give it a shorter name.
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Thanks to the GCC compile farm project, we can wire up syscalls
for sparc64 and set system-specific SFD_* constants properly.
I've FINALLY figured out how to use POSIX::SigSet to generate
a usable buffer for the syscall perlfunc. This is required
for endian-neutral behavior and relevant to sparc64, at least.
There's no need for signalfd-related stuff to be constants,
either. signalfd initialization is never a hot path and a stub
subroutine for constants uses several KB of memory in the
interpreter.
We'll drop the needless SEEK_CUR import while we're importing
O_NONBLOCK, too.
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In case output is redirected to a pipe, ensure stdout and stderr
are always unbuffered, as -watch may go long periods without
any output to fill up buffers.
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We can avoid synchronous `waitpid(-1, 0)' and save a process
when simultaneously watching Maildirs.
One DS bug is fixed: ->Reset needs to clear the DS $in_loop flag
in forked children so dwaitpid() fails and allows git processes
to be reaped synchronously. TestCommon also calls DS->Reset
when spawning new processes, since t/imapd.t uses DS->EventLoop
while waiting on -watch to write.
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We can get rid of the janky wannabe
self-using-a-directory-instead-of-pipe thing we needed to
workaround Filesys::Notify::Simple being blocking.
For existing Maildir users, this should be more robust and
immune to missed wakeups for signalfd and kqueue-enabled
systems; as well as being immune to BOFHs clearing $TMPDIR
and preventing notifications from firing.
The IMAP IDLE code still uses normal Perl signals, so it's still
vulnerable to missed wakeups. That will be addressed in future
commits.
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Since we already use inotify and EVFILT_VNODE (kqueue)
in -imapd, we might as well use them directly in -watch,
too.
This will allow public-inbox-watch to use PublicInbox::DS
for timers to watch newsgroups/mailboxes and have saner
signal handling in future commits.
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I didn't wait until September to do it, this year!
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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This should be more reliable and safer as it'll ensure
existing fast-import instances are shut down properly.
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We need to ensure new messages are being processed
fairly during full rescans, so have the ->scan subroutine
yield and reschedule itself. Additionally, having a
long-running task inside the signal handler is dangerous
and subject to reentrancy bugs.
Due to the limitations of the Filesys::Notify::Simple interface,
we cannot rely on multiplexing I/O interfaces (select, IO::Poll,
Danga::Socket, etc...) for this. Forking a separate process
was considered, but it is more expensive for a mostly-idle
process.
So, we use a variant of the "self-pipe trick" via inotify (or
whatever Filesys::Notify::Simple gives us). Instead of writing
to our own pipe, we write to a file in our own temporary
directory watched by Filesys::Notify::Simple to trigger events
in signal handlers.
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Otherwise the old watcher may run indefinitely
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This can be useful for adding new lists, as restarting is
expensive (but still non-lossy).
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This will allow users to run importers off existing mail
accounts where they may not have access to run -mda.
Currently, we only support Maildirs, but IMAP ought to be
doable.
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