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* sys/sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326256
* Fix a variety of cosmetic typos and misspellingsConrad Meyer2017-01-151-1/+1
| | | | | | | | | | | No functional change. PR: 216096, 216097, 216098, 216101, 216102, 216106, 216109, 216110 Reported by: Bulat <bltsrc at mail.ru> Sponsored by: Dell EMC Isilon Notes: svn path=/head/; revision=312235
* Add a resource limit for the total number of kqueues available to theKonstantin Belousov2013-10-211-0/+1
| | | | | | | | | | | | | | | | | | | | | user. Kqueue now saves the ucred of the allocating thread, to correctly decrement the counter on close. Under some specific and not real-world use scenario for kqueue, it is possible for the kqueues to consume memory proportional to the square of the number of the filedescriptors available to the process. Limit allows administrator to prevent the abuse. This is kernel-mode side of the change, with the user-mode enabling commit following. Reported and tested by: pho Discussed with: jmg Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Notes: svn path=/head/; revision=256849
* Use TAILQ instead of STAILQ for kqeueue filedescriptors to ensure constantKonstantin Belousov2013-09-131-1/+1
| | | | | | | | | | | | | time removal on kqueue close. Reported and tested by: pho Reviewed by: jmg Sponsored by: The FreeBSD Foundation MFC after: 1 week Approved by: re (delphij) Notes: svn path=/head/; revision=255527
* Add locking to the kqueue subsystem. This also makes the kqueue subsystemJohn-Mark Gurney2004-08-151-3/+20
| | | | | | | | | | | | | | | | a more complete subsystem, and removes the knowlege of how things are implemented from the drivers. Include locking around filter ops, so a module like aio will know when not to be unloaded if there are outstanding knotes using it's filter ops. Currently, it uses the MTX_DUPOK even though it is not always safe to aquire duplicate locks. Witness currently doesn't support the ability to discover if a dup lock is ok (in some cases). Reviewed by: green, rwatson (both earlier versions) Notes: svn path=/head/; revision=133741
* Make FIOASYNC, FIOSETOWN and FIOGETOWN work on kqueues.Alfred Perlstein2004-07-141-1/+3
| | | | Notes: svn path=/head/; revision=132138
* Simplify kqueue API slightly.Jonathan Lemon2000-07-181-7/+2
| | | | | | | Discussed on: -arch Notes: svn path=/head/; revision=63452
* Back out the previous change to the queue(3) interface.Jake Burkholder2000-05-261-1/+1
| | | | | | | | | It was not discussed and should probably not happen. Requested by: msmith and others Notes: svn path=/head/; revision=60938
* Change the way that the queue(3) structures are declared; don't assume thatJake Burkholder2000-05-231-1/+1
| | | | | | | | | | | the type argument to *_HEAD and *_ENTRY is a struct. Suggested by: phk Reviewed by: phk Approved by: mdodd Notes: svn path=/head/; revision=60833
* Add files that I forgot to `cvs add' on last commit.Jonathan Lemon2000-04-161-0/+51
Notes: svn path=/head/; revision=59290
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