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Konstantin Belousov 85a0ddfd0b Add a resource limit for the total number of kqueues available to the 
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
2013-10-21 16:46:12 +00:00
..
cat - Add the __dead2 attribute since it is a function that never returns 2013-04-23 13:03:11 +00:00
chflags Expand the use of stat(2) flags to allow storing some Windows/DOS 2013-08-21 23:04:48 +00:00
chio Update chio(1) and ch(4) to support reporting element designators. 2013-04-19 20:03:51 +00:00
chmod Update sticky(7) cross references. 2011-05-13 16:29:57 +00:00
cp Add a few examples. 2013-03-15 20:12:54 +00:00
csh Update to tcsh 6.18.01. 2012-02-22 03:36:15 +00:00
date Fix socket calls on error post-r243965. 2012-12-21 15:54:13 +00:00
dd Sweep man pages replacing ad -> ada. 2013-10-01 18:41:53 +00:00
df Complete revision 243104. 2013-05-17 03:52:20 +00:00
domainname Point users towards nisdomainname and rc.conf. 2013-04-22 17:55:12 +00:00
echo echo(1): Clarify portability and mention literal "--" handling. 2010-11-12 22:43:40 +00:00
ed Fix a -Wunsequenced warning. 2013-06-29 15:49:26 +00:00
expr Add the Clang specific -Wmissing-variable-declarations to WARNS=6. 2013-04-19 19:45:00 +00:00
freebsd-version Remove extraneous \n. 2013-10-11 20:10:18 +00:00
getfacl Fix warnings found by -Wmising-variable-declarations. 2012-10-19 05:43:38 +00:00
hostname Mark usage() __dead2 2013-04-28 22:52:43 +00:00
kenv Constify parameters, no functional or binary change. 2013-05-15 18:38:28 +00:00
kill Remove cast that was only required for K&R C. 2013-04-28 22:05:01 +00:00
ln Add 'static' where able. 2013-06-02 17:55:00 +00:00
ls Expand the use of stat(2) flags to allow storing some Windows/DOS 2013-08-21 23:04:48 +00:00
mkdir Add missing static qualifiers 2013-04-27 21:59:43 +00:00
mv - Make 'flags' argument to chflags(2), fchflags(2) and lchflags(2) of type 2013-03-21 22:44:33 +00:00
pax Fix warnings found by -Wmising-variable-declarations. 2012-10-19 05:43:38 +00:00
pkill Remove useless check - ki_loginclass is an array; can't be NULL. 2013-10-04 16:08:44 +00:00
ps Don't test arrays for being NULL. 2013-10-21 09:12:04 +00:00
pwait Use a different way to silence clang analyzer as done in r245494 by 2013-01-16 18:15:25 +00:00
pwd
rcp Fix warnings found by -Wmising-variable-declarations. 2012-10-19 05:43:38 +00:00
realpath Make `realpath'' behave like `realpath .''. 2011-06-21 19:34:57 +00:00
rm Add two more 'static' qualifiers 2013-04-26 17:56:35 +00:00
rmail Bump WARNS where possible. 2010-02-15 14:07:40 +00:00
rmdir Add a few examples. 2013-03-15 20:12:54 +00:00
setfacl Mention that read_attributes, write_attributes, read_acl and write_acl 2013-04-01 13:17:28 +00:00
sh Add a resource limit for the total number of kqueues available to the 2013-10-21 16:46:12 +00:00
sleep sleep: Explain in a comment why the [EINTR] check is there. 2013-06-05 20:15:18 +00:00
stty stty: Mark usage() __dead2. 2012-07-15 21:12:22 +00:00
sync
test test(1): Add information about replacing -nt/-ot. 2013-05-31 22:57:04 +00:00
uuidgen Mention the upper hard limit for -n option. Patch slightly modified 2012-05-23 16:19:19 +00:00
Makefile By popular demand, move freebsd-version(1) from /libexec to /bin. 2013-10-09 20:47:20 +00:00
Makefile.inc