101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* $NetBSD: refuse_log.c,v 1.2 2022/01/29 00:03:41 tnn Exp $ */
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/*
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* Copyright (c) 2021 The NetBSD Foundation, Inc.
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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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: refuse_log.c,v 1.2 2022/01/29 00:03:41 tnn Exp $");
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#endif /* !lint */
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#include <assert.h>
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#include <fuse_log.h>
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#if defined(MULTITHREADED_REFUSE)
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# include <pthread.h>
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#endif
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#include <stdio.h>
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static void __printflike(2, 0)
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default_log_func(enum fuse_log_level level __attribute__((__unused__)),
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const char *fmt, va_list ap) {
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/* This function needs to be thread-safe. Calling vfprintf(3)
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* should be okay because POSIX mandates locking FILE* objects
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* internally. */
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vfprintf(stderr, fmt, ap);
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}
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#if defined(MULTITHREADED_REFUSE)
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static pthread_mutex_t log_func_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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static fuse_log_func_t log_func = default_log_func;
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void
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fuse_set_log_func(fuse_log_func_t func) {
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#if defined(MULTITHREADED_REFUSE)
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/* What we really need here is merely a memory barrier, but
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* locking a mutex is the easiest way to achieve that. */
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int rv;
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rv = pthread_mutex_lock(&log_func_mutex);
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assert(rv == 0);
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#endif
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if (func)
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log_func = func;
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else
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log_func = default_log_func;
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#if defined(MULTITHREADED_REFUSE)
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rv = pthread_mutex_unlock(&log_func_mutex);
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assert(rv == 0);
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#endif
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}
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void
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fuse_log(enum fuse_log_level level, const char *fmt, ...) {
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va_list ap;
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#if defined(MULTITHREADED_REFUSE)
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/* What we really need here is merely a memory barrier, but
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* locking a mutex is the easiest way to achieve that. */
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int rv;
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rv = pthread_mutex_lock(&log_func_mutex);
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assert(rv == 0);
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#endif
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va_start(ap, fmt);
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log_func(level, fmt, ap);
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va_end(ap);
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#if defined(MULTITHREADED_REFUSE)
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rv = pthread_mutex_unlock(&log_func_mutex);
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assert(rv == 0);
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#endif
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}
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