syslog.cpp revision bc74ecfaf5de47056fd8a48db65c0e5aef892f0c 
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 <stdlib.h>
18#include <syslog.h>
19
20#include "private/libc_logging.h"
21
22static const char* syslog_log_tag = NULL;
23static int syslog_priority_mask = 0xff;
24
25void closelog() {
26  syslog_log_tag = NULL;
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// HACK to avoid lock up on certain devices. This will be reverted when
51// that is fixed.
52#if 0
53  // Check whether we're supposed to be logging messages of this priority.
54  if ((syslog_priority_mask & LOG_MASK(LOG_PRI(priority))) == 0) {
55    return;
56  }
57
58  // What's our log tag?
59  const char* log_tag = syslog_log_tag;
60  if (log_tag == NULL) {
61    log_tag = getprogname();
62  }
63
64  // What's our Android log priority?
65  priority &= LOG_PRIMASK;
66  int android_log_priority;
67  if (priority <= LOG_ERR) {
68    android_log_priority = ANDROID_LOG_ERROR;
69  } else if (priority == LOG_WARNING) {
70    android_log_priority = ANDROID_LOG_WARN;
71  } else if (priority <= LOG_INFO) {
72    android_log_priority = ANDROID_LOG_INFO;
73  } else {
74    android_log_priority = ANDROID_LOG_DEBUG;
75  }
76
77  __libc_format_log_va_list(android_log_priority, log_tag, fmt, args);
78#endif
79}
80