80e669df9e
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
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*-
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* Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_EVENTVAR_H_
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#define _SYS_EVENTVAR_H_
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#ifndef _KERNEL
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#error "no user-servicable parts inside"
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#endif
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#include <sys/_task.h>
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#define KQ_NEVENTS 8 /* minimize copy{in,out} calls */
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#define KQEXTENT 256 /* linear growth by this amount */
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struct kqueue {
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struct mtx kq_lock;
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int kq_refcnt;
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TAILQ_ENTRY(kqueue) kq_list;
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TAILQ_HEAD(, knote) kq_head; /* list of pending event */
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int kq_count; /* number of pending events */
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struct selinfo kq_sel;
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struct sigio *kq_sigio;
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struct filedesc *kq_fdp;
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int kq_state;
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#define KQ_SEL 0x01
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#define KQ_SLEEP 0x02
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#define KQ_FLUXWAIT 0x04 /* waiting for a in flux kn */
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#define KQ_ASYNC 0x08
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#define KQ_CLOSING 0x10
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#define KQ_TASKSCHED 0x20 /* task scheduled */
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#define KQ_TASKDRAIN 0x40 /* waiting for task to drain */
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int kq_knlistsize; /* size of knlist */
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struct klist *kq_knlist; /* list of knotes */
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u_long kq_knhashmask; /* size of knhash */
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struct klist *kq_knhash; /* hash table for knotes */
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struct task kq_task;
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struct ucred *kq_cred;
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};
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#endif /* !_SYS_EVENTVAR_H_ */
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