1 /*
2 * Copyright 2021 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 "gd/os/syslog.h"
18
19 #include <syslog.h>
20
21 #include <cstdarg>
22 #include <memory>
23
24 #include "gd/os/log_tags.h"
25
26 namespace {
27 #define SYSLOG_IDENT "btadapterd"
28
29 const char kSyslogIdent[] = SYSLOG_IDENT;
30
31 // Map LOG_TAG_* to syslog mappings
32 const int kTagMap[] = {
33 /*LOG_TAG_FATAL=*/LOG_CRIT,
34 /*LOG_TAG_ERROR=*/LOG_ERR,
35 /*LOG_TAG_WARN=*/LOG_WARNING,
36 /*LOG_TAG_NOTICE=*/LOG_NOTICE,
37 /*LOG_TAG_INFO=*/LOG_INFO,
38 /*LOG_TAG_DEBUG=*/LOG_DEBUG,
39 /*LOG_TAG_VERBOSE=*/LOG_DEBUG,
40 };
41
42 static_assert(sizeof(kTagMap) / sizeof(kTagMap[0]) == LOG_TAG_VERBOSE + 1);
43
44 class SyslogWrapper {
45 public:
SyslogWrapper()46 SyslogWrapper() {
47 openlog(kSyslogIdent, LOG_CONS | LOG_NDELAY | LOG_PID | LOG_PERROR, LOG_DAEMON);
48 }
49
~SyslogWrapper()50 ~SyslogWrapper() {
51 closelog();
52 }
53 };
54
55 std::unique_ptr<SyslogWrapper> gSyslog;
56 } // namespace
57
write_syslog(int tag,const char * format,...)58 void write_syslog(int tag, const char* format, ...) {
59 if (!gSyslog) {
60 gSyslog = std::make_unique<SyslogWrapper>();
61 }
62
63 // I don't expect to see incorrect tags but making the check anyway so we
64 // don't go out of bounds in the array above.
65 tag = tag <= LOG_TAG_VERBOSE ? tag : LOG_TAG_ERROR;
66 int level = kTagMap[tag];
67
68 va_list args;
69 va_start(args, format);
70 vsyslog(level, format, args);
71 va_end(args);
72 }
73