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We were listening for SIGCHLD in the wrong process.
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This partly reverts:
commit 6d1b1e0bc6bd020218afc5f05286bf372be283d5
Author: Tom Gundersen <teg@jklm.no>
Date: Sun May 24 15:10:04 2015 +0200
udevd: worker - fully clean up unnecessary fds
The inotify-fd _is_ used in the workers, so don't close it! Have a look at
udev-watch.c, which keeps track of the inotify-fd as a global variable
(ugh!).
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We would enforce that events could only be added to the queue from the
main process, but that brake in daemonized mode. Relax the restriction
to only allow one process to add events to the queue.
Reported by Mantas Mikulėnas.
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Initialize structs when declaring rather than using memzero().
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These are only ever used in the parent process, so close them early in the worker.
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The original code used fread(), which on some libc implementions
(ie glibc 2.17) would pre-read a full 4K (PAGE_SIZE) of the
PCI config space, when only 64 bytes were requested.
I have recently come across PCIe hardware which responds with
Completion Timeouts when accesses above 256 bytes are attempted.
This can cause server systems with GHES/AEPI support to cause
and immediate kernel panic due to the failed PCI transaction.
This change replaces the buffered fread() with an explict
unbuffered read() of 64 bytes, which corrects this issue by
only reading the guaranteed first 64 bytes of PCIe config space.
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The parser used for MTU and Speed expects them to be size_t, not unsigned int.
This caused a corruption in the rest of the structure.
Reported by David O Neill <david.m.oneill@intel.com>.
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Makes it a bit clearer what is going on, rather than jumping to the end of main().
No functional change.
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First parse config, then sanitize environment before donig any further setup.
No functional change.
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No functional change.
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This uses kill_and_sigcont() instead of kill(), otherwise no functional change.
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We were returning rather than continuing in some cases. The intention
was always to fully process all pending events before returning
from the SIGCHLD handler. Restore this behaviour.
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No functional change.
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No functional change.
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This way it is more obvious that the queue flag file is always
up-to-date. Moreover, we only have to touch/unlink it when the
first/last event is allocated/freed.
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EAGAIN means there are no more messages to read, so give up. EINTR means we got interrupted
reading a message, so try again.
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When notifying the main daemon about event completion, make sure the message is sent
successfully, and not interrupted.
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Path, Driver and Type are now strv rather than strings, so free them properly.
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Bring this in line with the rest of the codebase.
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Stop relying on global variables in event handlers, and move them
all to a Manager object instead.
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This avoids updating the flag files twice for every loop, and also removes another dependency
in the main-loop, so we are freer to reshufle it as we want.
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Rather than skippling ctrl handling whenever we have handlede inotify events
(and hence may have synthesized a 'change' event), just call the uevent
handling explicitly from on_inotify() so that the event queue is up-to-date.
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This allows us to simplify the ctrl_msg handler. Eventually all this global state should move to
a Manager object or so.
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Simply query the size of the hashmap keeping all the worker contexts instead.
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This makes the code somewhat more readable.
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Make the worker context have the same life-span as the worker process. It is created on fork()
and free'd on SIGCHLD.
The change means that we can get worker_returned() for a worker context that is no longer around,
this is not a problem and we can just drop the message. The only use for worker_returned() is to
know to reschedule events to workers that are still around, so if the worker has already exited
it is not important to keep track of. We still print a debug statement in this case to be on the
safe side.
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Eeeew!
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Follow the coding style and avoid the exit handlers.
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We never return magic exit codes, but just EXIT_FAILUER or EXIT_SUCCESS.
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Take and drop explicit references where it makes sense.
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This is not used in the worker, so avoid having to free it there.
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We used to use this to track failed events so they could be retriggered,
but that is no longer done, so the code can be dropped.
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If the main daemon is not notified about a worker finishing an event
the refcounting of the worker struct will be wrong, and we will lose
track of the number of children we have to wait for.
This should not happen, but if it does we better complain loudly about
it. Worst case udev will wait for 30 seconsd at shutdown waiting for
nonexistent workers.
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No need to include this explicitly, just use SCM_CREDENTIALS.
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We should not be receiving these anyway, but let's be correct.
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