diff options
Diffstat (limited to 'usr/src/cmd/auditd/queue.c')
| -rw-r--r-- | usr/src/cmd/auditd/queue.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/usr/src/cmd/auditd/queue.c b/usr/src/cmd/auditd/queue.c new file mode 100644 index 0000000000..8e51030472 --- /dev/null +++ b/usr/src/cmd/auditd/queue.c @@ -0,0 +1,172 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2003 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <pthread.h> +#include <memory.h> +#include "queue.h" +#include <stdio.h> +#include <assert.h> +#include "plugin.h" + +#define DEBUG 0 + +#if DEBUG +static FILE *dbfp; +extern FILE *__auditd_debug_file_open(); +#define DPRINT(x) {(void) fprintf x; } +#else +#define DPRINT(x) +#endif + +void +audit_queue_init(au_queue_t *q) +{ + q->auq_head = NULL; + q->auq_tail = NULL; + (void) pthread_mutex_init(&q->auq_lock, NULL); + q->auq_count = 0; +#if DEBUG + dbfp = __auditd_debug_file_open(); +#endif +} + +/* + * enqueue() caller creates queue entry + */ + +void +audit_enqueue(au_queue_t *q, void *p) +{ + (void) pthread_mutex_lock(&q->auq_lock); + + DPRINT((dbfp, "enqueue0(%X): p=%X, head=%X, tail=%X, count=%d\n", + q, p, q->auq_head, q->auq_tail, q->auq_count)); + + if (q->auq_head == NULL) + q->auq_head = p; + else { + DPRINT((dbfp, "\tindirect tail=%X\n", + &(((audit_link_t *)(q->auq_tail))->aln_next))); + + ((audit_link_t *)(q->auq_tail))->aln_next = p; + } + q->auq_tail = p; + ((audit_link_t *)p)->aln_next = NULL; + q->auq_count++; + + DPRINT((dbfp, "enqueue1(%X): p=%X, head=%X, tail=%X, " + "count=%d, pnext=%X\n", + q, p, q->auq_head, q->auq_tail, q->auq_count, + ((audit_link_t *)p)->aln_next)); + + (void) pthread_mutex_unlock(&q->auq_lock); +} + +/* + * audit_dequeue() returns entry; caller is responsible for free + */ + +int +audit_dequeue(au_queue_t *q, void **p) +{ + (void) pthread_mutex_lock(&q->auq_lock); + + if ((*p = q->auq_head) == NULL) { + DPRINT((dbfp, "dequeue1(%X): p=%X, head=%X, " + "tail=%X, count=%d\n", + q, *p, q->auq_head, q->auq_tail, q->auq_count)); + + (void) pthread_mutex_unlock(&q->auq_lock); + return (1); + } + q->auq_count--; + + /* if *p is the last, next is NULL */ + q->auq_head = ((audit_link_t *)*p)->aln_next; + + DPRINT((dbfp, "dequeue0(%X): p=%X, head=%X, tail=%X, " + "count=%d, pnext=%X\n", + q, *p, q->auq_head, q->auq_tail, q->auq_count, + ((audit_link_t *)*p)->aln_next)); + + (void) pthread_mutex_unlock(&q->auq_lock); + return (0); +} + +/* + * increment ref count + */ +void +audit_incr_ref(pthread_mutex_t *l, audit_rec_t *p) +{ + (void) pthread_mutex_lock(l); + p->abq_ref_count++; + DPRINT((dbfp, "incr_ref: p=%X, count=%d\n", + p, p->abq_ref_count)); + (void) pthread_mutex_unlock(l); +} +/* + * decrement reference count; if it reaches zero, + * return a pointer to it. Otherwise, return NULL. + */ +audit_rec_t * +audit_release(pthread_mutex_t *l, audit_rec_t *p) +{ + assert(p != NULL); + + (void) pthread_mutex_lock(l); + + DPRINT((dbfp, "release: p=%X, count=%d\n", + p, p->abq_ref_count)); + + if (--(p->abq_ref_count) > 0) { + (void) pthread_mutex_unlock(l); + return (NULL); + } + (void) pthread_mutex_unlock(l); + + return (p); +} + +int +audit_queue_size(au_queue_t *q) +{ + int size; + + (void) pthread_mutex_lock(&q->auq_lock); + size = q->auq_count; + (void) pthread_mutex_unlock(&q->auq_lock); + + return (size); +} + + +void +audit_queue_destroy(au_queue_t *q) +{ + (void) pthread_mutex_destroy(&q->auq_lock); +} |