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path: root/src/libstrongswan/processing/watcher.c
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* watcher: Don't notify watcher if removed FD was not foundTobias Brunner2017-10-101-2/+6
| | | | | | | | | | | | This can happen if a stream is used blocking exclusively (the FD is never registered with watcher, but is removed in the stream's destructor just in case it ever was - doing this conditionally would require an additional flag in streams). There may be no thread reading from the read end of the notify pipe (e.g. in starter), causing the write to the notify pipe to block after it's full. Anyway, doing a relatively expensive FD update is unnecessary if there were no changes. Fixes #1453.
* watcher: Avoid allocations due to enumeratorsTobias Brunner2016-10-041-37/+83
| | | | | Since the FD set could get rebuilt quite often this change avoids having to allocate memory just to enumerate the registered FDs.
* watcher: Check for cancellation if poll() fails with EINTRMartin Willi2015-12-041-0/+7
| | | | | | | With LinuxThreads, poll() is unfortunately no cancellation point. It seems that poll gets woken up after cancellation, but we actively must check for cancellation before re-entering poll to properly shut down the watcher thread.
* watcher: Proper handle poll() POLLHUP/NVAL signalingMartin Willi2014-11-281-13/+36
| | | | | | | poll() may return POLLHUP or POLLNVAL for given file descriptors. To handle these properly, we signal them to the EXCEPT watcher state, if registered. If not, we call the read/write callbacks, so they can properly fail when trying to read from or write to the file descriptor.
* watcher: Use Windows read/write(2) wrappers instead of compile-conditionsMartin Willi2014-11-211-8/+0
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* watcher: Use poll(2) instead of selectMartin Willi2014-11-211-24/+38
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* watcher: Add a method to query the watcher stateMartin Willi2014-09-241-7/+25
| | | | | This allows a user to check if the watcher is actually running, and potentially perform read operations directly instead of relying on watcher.
* watcher: Prevent race condition spawning multiple watcher threadsMartin Willi2014-06-171-1/+3
| | | | | | | | If file descriptors get added and removed in rapid succession, the active watcher thread might not take notice of it and continues running. However, add() spawns a watcher thread whenever a file descriptor is added to an empty set. This could result in multiple watcher threads, which is fixed by a proper check for running watchers.
* watcher: Add Windows supportMartin Willi2014-06-041-16/+80
| | | | | | | | | | Instead of a pipe we use a TCP socketpair (can't select() a _pipe()), and Windsock2 send/recv functions instead of read/write. Currently supported (and required) are file descriptors provided by Winsock only; we might use a separate mechanism for traditional file handles if required (or switch to Windows events and WaitForMultipleObjects) for a future version.
* watcher: Don't wait for running callback once watcher thread cancelledMartin Willi2014-05-071-1/+8
| | | | | | | | During shutdown, waiting for callbacks might never complete, as queued callbacks might not get executed under certain conditions. Not the clean fix, but works good enough for now. Seen on Windows in vici tests.
* watcher: Avoid queueing multiple watcher callbacks at the same timeMartin Willi2014-05-071-1/+8
| | | | | | | | | While we don't add FDs with an active callback to the watched FDSET, we still can get notifications for callbacks active due the asynchronous processing of the same. To avoid queue multiple callbacks, we check for queued callbacks before activating new ones.
* watcher: Don't complain if select() syscall got interruptedMartin Willi2014-01-221-1/+1
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* watcher: Rebuild fdset when select() failsMartin Willi2013-10-241-1/+12
| | | | | | This should make sure we refresh the fdset if a user closes an FD it just removed. Some selects() seem to complain about the bad FD before signaling the notification pipe.
* watcher: Made notify array initialization compatible with older GCC versionsTobias Brunner2013-07-251-2/+1
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* watcher: use processors new execute_job() to notify FDsMartin Willi2013-07-181-9/+1
| | | | | Just queueing is problematic, as all threads might be busy waiting for events that the queued (but never executed) job delivers.
* watcher: properly support multiple watch callback types for the same FDMartin Willi2013-07-181-35/+40
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* watcher: read multiple notifications if availableMartin Willi2013-07-181-2/+15
| | | | | Use non-blocking I/O on the read end of the notify pipe. This also makes sure the read does not block should select() signal data while there is none.
* watcher: add some debugging statementsMartin Willi2013-07-181-0/+12
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* watcher: if the processor has no threads, execute the job with watcher threadMartin Willi2013-07-181-11/+19
| | | | | This is important during shutdown, where we might need to signal some FDs while all idle threads are gone already.
* watcher: unregister a watcher FD if its thread gets cancelledMartin Willi2013-07-181-0/+13
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* watcher: release threads waiting in remove() when watcher thread gets cancelledMartin Willi2013-07-181-0/+24
| | | | | | | During daemon shutdown, users might call remove() after processor.set_threads(0) has been called. This gets problematic, as a watch event might be unable to signal completion when no threads are available anymore. Work around this issue by cancelling waiters once processor.cancel() has been called.
* watcher: add a centralized an generic facility to monitor file descriptorsMartin Willi2013-07-181-0/+396
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