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