04a7b2d379
than defaulting the cmode argument to vn_open() to 0. Supply a default argument of ALQ_DEFAULT_CMODE (0600) in current callers. Discussed with/pointed out by: hmp Reveiwed by: jeff, hmp MFC after: 3 days
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*-
|
|
* Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
#ifndef _SYS_ALQ_H_
|
|
#define _SYS_ALQ_H_
|
|
|
|
/*
|
|
* Opaque type for the Async. Logging Queue
|
|
*/
|
|
struct alq;
|
|
|
|
/* The thread for the logging daemon */
|
|
extern struct thread *ald_thread;
|
|
|
|
/*
|
|
* Async. Logging Entry
|
|
*/
|
|
struct ale {
|
|
struct ale *ae_next; /* Next Entry */
|
|
char *ae_data; /* Entry buffer */
|
|
int ae_flags; /* Entry flags */
|
|
};
|
|
|
|
#define AE_VALID 0x0001 /* Entry has valid data */
|
|
|
|
|
|
/* waitok options */
|
|
#define ALQ_NOWAIT 0x0001
|
|
#define ALQ_WAITOK 0x0002
|
|
|
|
/* Suggested mode for file creation. */
|
|
#define ALQ_DEFAULT_CMODE 0600
|
|
|
|
/*
|
|
* alq_open: Creates a new queue
|
|
*
|
|
* Arguments:
|
|
* alq Storage for a pointer to the newly created queue.
|
|
* file The filename to open for logging.
|
|
* cred Credential to authorize open and I/O with.
|
|
* cmode Creation mode for file, if new.
|
|
* size The size of each entry in the queue.
|
|
* count The number of items in the buffer, this should be large enough
|
|
* to store items over the period of a disk write.
|
|
* Returns:
|
|
* error from open or 0 on success
|
|
*/
|
|
struct ucred;
|
|
int alq_open(struct alq **, const char *file, struct ucred *cred, int cmode,
|
|
int size, int count);
|
|
|
|
/*
|
|
* alq_write: Write data into the queue
|
|
*
|
|
* Arguments:
|
|
* alq The queue we're writing to
|
|
* data The entry to be recorded
|
|
* waitok Are we permitted to wait?
|
|
*
|
|
* Returns:
|
|
* EWOULDBLOCK if:
|
|
* Waitok is ALQ_NOWAIT and the queue is full.
|
|
* The system is shutting down.
|
|
* 0 on success.
|
|
*/
|
|
int alq_write(struct alq *alq, void *data, int waitok);
|
|
|
|
/*
|
|
* alq_flush: Flush the queue out to disk
|
|
*/
|
|
void alq_flush(struct alq *alq);
|
|
|
|
/*
|
|
* alq_close: Flush the queue and free all resources.
|
|
*/
|
|
void alq_close(struct alq *alq);
|
|
|
|
/*
|
|
* alq_get: Return an entry for direct access
|
|
*
|
|
* Arguments:
|
|
* alq The queue to retrieve an entry from
|
|
* waitok Are we permitted to wait?
|
|
*
|
|
* Returns:
|
|
* The next available ale on success.
|
|
* NULL if:
|
|
* Waitok is ALQ_NOWAIT and the queue is full.
|
|
* The system is shutting down.
|
|
*
|
|
* This leaves the queue locked until a subsequent alq_post.
|
|
*/
|
|
struct ale *alq_get(struct alq *alq, int waitok);
|
|
|
|
/*
|
|
* alq_post: Schedule the ale retrieved by alq_get for writing.
|
|
* alq The queue to post the entry to.
|
|
* ale An asynch logging entry returned by alq_get.
|
|
*/
|
|
void alq_post(struct alq *, struct ale *);
|
|
|
|
#endif /* _SYS_ALQ_H_ */
|