123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*-
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* Copyright (c) 2002, Jeffrey Roberson <jeff@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 unmodified, this list of conditions, and the following
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* 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS_ALQ_H_
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#define _SYS_ALQ_H_
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/*
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* Opaque type for the Async. Logging Queue
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*/
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struct alq;
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/* The thread for the logging daemon */
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extern struct thread *ald_thread;
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/*
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* Async. Logging Entry
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*/
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struct ale {
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struct ale *ae_next; /* Next Entry */
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char *ae_data; /* Entry buffer */
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int ae_flags; /* Entry flags */
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};
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#define AE_VALID 0x0001 /* Entry has valid data */
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/* waitok options */
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#define ALQ_NOWAIT 0x0001
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#define ALQ_WAITOK 0x0002
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/*
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* alq_open: Creates a new queue
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*
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* Arguments:
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* alq Storage for a pointer to the newly created queue.
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* file The filename to open for logging.
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* size The size of each entry in the queue.
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* count The number of items in the buffer, this should be large enough
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* to store items over the period of a disk write.
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* Returns:
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* error from open or 0 on success
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*/
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struct ucred;
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int alq_open(struct alq **, const char *file, struct ucred *cred, int size,
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int count);
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/*
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* alq_write: Write data into the queue
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*
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* Arguments:
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* alq The queue we're writing to
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* data The entry to be recorded
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* waitok Are we permitted to wait?
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*
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* Returns:
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* EWOULDBLOCK if:
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* Waitok is ALQ_NOWAIT and the queue is full.
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* The system is shutting down.
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* 0 on success.
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*/
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int alq_write(struct alq *alq, void *data, int waitok);
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/*
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* alq_flush: Flush the queue out to disk
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*/
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void alq_flush(struct alq *alq);
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/*
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* alq_close: Flush the queue and free all resources.
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*/
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void alq_close(struct alq *alq);
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/*
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* alq_get: Return an entry for direct access
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*
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* Arguments:
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* alq The queue to retrieve an entry from
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* waitok Are we permitted to wait?
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*
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* Returns:
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* The next available ale on success.
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* NULL if:
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* Waitok is ALQ_NOWAIT and the queue is full.
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* The system is shutting down.
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*
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* This leaves the queue locked until a subsequent alq_post.
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*/
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struct ale *alq_get(struct alq *alq, int waitok);
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/*
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* alq_post: Schedule the ale retrieved by alq_get for writing.
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* alq The queue to post the entry to.
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* ale An asynch logging entry returned by alq_get.
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*/
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void alq_post(struct alq *, struct ale *);
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#endif /* _SYS_ALQ_H_ */
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