syslog.cpp revision b76613627d045acd3bdb7294f424f14c21584872 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <syslog.h>
18
19#include <stdlib.h>
20
21#include "private/libc_logging.h"
22
23static const char* syslog_log_tag = NULL;
24static int syslog_priority_mask = 0xff;
25
26void closelog() {
27}
28
29void openlog(const char* log_tag, int /*options*/, int /*facility*/) {
30  syslog_log_tag = log_tag;
31}
32
33int setlogmask(int new_mask) {
34  int old_mask = syslog_priority_mask;
35  // 0 is used to query the current mask.
36  if (new_mask != 0) {
37    syslog_priority_mask = new_mask;
38  }
39  return old_mask;
40}
41
42void syslog(int priority, const char* fmt, ...) {
43  va_list args;
44  va_start(args, fmt);
45  vsyslog(priority, fmt, args);
46  va_end(args);
47}
48
49void vsyslog(int priority, const char* fmt, va_list args) {
50  // Check whether we're supposed to be logging messages of this priority.
51  if ((syslog_priority_mask & LOG_MASK(LOG_PRI(priority))) == 0) {
52    return;
53  }
54
55  // What's our log tag?
56  const char* log_tag = syslog_log_tag;
57  if (log_tag == NULL) {
58    log_tag = getprogname();
59  }
60
61  // What's our Android log priority?
62  priority &= LOG_PRIMASK;
63  int android_log_priority;
64  if (priority < LOG_ERR) {
65    android_log_priority = ANDROID_LOG_ERROR;
66  } else if (priority == LOG_WARNING) {
67    android_log_priority = ANDROID_LOG_WARN;
68  } else if (priority <= LOG_INFO) {
69    android_log_priority = ANDROID_LOG_INFO;
70  } else {
71    android_log_priority = ANDROID_LOG_DEBUG;
72  }
73
74  __libc_format_log_va_list(android_log_priority, log_tag, fmt, args);
75}
76