1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <async_safe/log.h>
static const char* syslog_log_tag = nullptr;
static int syslog_priority_mask = 0xff;
void closelog() {
syslog_log_tag = nullptr;
}
void openlog(const char* log_tag, int /*options*/, int /*facility*/) {
syslog_log_tag = log_tag;
}
int setlogmask(int new_mask) {
int old_mask = syslog_priority_mask;
// 0 is used to query the current mask.
if (new_mask != 0) {
syslog_priority_mask = new_mask;
}
return old_mask;
}
void syslog(int priority, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
vsyslog(priority, fmt, args);
va_end(args);
}
void vsyslog(int priority, const char* fmt, va_list args) {
// Check whether we're supposed to be logging messages of this priority.
if ((syslog_priority_mask & LOG_MASK(LOG_PRI(priority))) == 0) {
return;
}
// What's our log tag?
const char* log_tag = syslog_log_tag;
if (log_tag == nullptr) {
log_tag = getprogname();
}
// What's our Android log priority?
priority &= LOG_PRIMASK;
int android_log_priority;
if (priority <= LOG_ERR) {
android_log_priority = ANDROID_LOG_ERROR;
} else if (priority == LOG_WARNING) {
android_log_priority = ANDROID_LOG_WARN;
} else if (priority <= LOG_INFO) {
android_log_priority = ANDROID_LOG_INFO;
} else {
android_log_priority = ANDROID_LOG_DEBUG;
}
// We can't let async_safe_format_log do the formatting because it doesn't support
// all the printf functionality.
char log_line[1024];
vsnprintf(log_line, sizeof(log_line), fmt, args);
async_safe_format_log(android_log_priority, log_tag, "%s", log_line);
}
|
