linux-user: Add support for a group of btrfs ioctls used for snapshots
[qemu.git] / tools / virtiofsd / fuse_log.c
1 /*
2 * FUSE: Filesystem in Userspace
3 * Copyright (C) 2019 Red Hat, Inc.
4 *
5 * Logging API.
6 *
7 * This program can be distributed under the terms of the GNU LGPLv2.
8 * See the file COPYING.LIB
9 */
10
11 #include "qemu/osdep.h"
12 #include "fuse_log.h"
13
14 #include <stdarg.h>
15 #include <stdio.h>
16
17 static void default_log_func(__attribute__((unused)) enum fuse_log_level level,
18 const char *fmt, va_list ap)
19 {
20 vfprintf(stderr, fmt, ap);
21 }
22
23 static fuse_log_func_t log_func = default_log_func;
24
25 void fuse_set_log_func(fuse_log_func_t func)
26 {
27 if (!func) {
28 func = default_log_func;
29 }
30
31 log_func = func;
32 }
33
34 void fuse_log(enum fuse_log_level level, const char *fmt, ...)
35 {
36 va_list ap;
37
38 va_start(ap, fmt);
39 log_func(level, fmt, ap);
40 va_end(ap);
41 }