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* sighook: Make sigunhook() O(1)Tavian Barnes2024-07-151-41/+51
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* sighook: Replace sigtables with RCU-protected linked listsTavian Barnes2024-07-071-148/+68
| | | | | | | | This fixes an ABA problem where sigdispatch() could think no handlers are registered for a signal even when there are. Link: https://unix.stackexchange.com/a/779594/56202 Fixes: 375caac ("sighook: New utilities for hooking signals")
* sighook: Shard the signal tableTavian Barnes2024-06-071-7/+24
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* sighook: Ignore sigaction() errors in atsigexit()Tavian Barnes2024-06-071-10/+6
| | | | This fixes bfs under Valgrind, which reserves SIGRTMAX for its own use.
* sighook: Check that atomic size_t is lock-freeTavian Barnes2024-06-031-0/+4
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* sighook: Allow sigunhook(NULL)Tavian Barnes2024-05-251-0/+4
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* diag: New helpers to include xstrerror(errno) automaticallyTavian Barnes2024-05-171-2/+2
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* sighook: New utilities for hooking signalsTavian Barnes2024-05-161-0/+600
This allows multiple hooks to be installed for a single signal.