1 /*
2  * Copyright (C) 2016 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 #ifndef _LOGGING_H
18 #define _LOGGING_H
19 
20 #include <stddef.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 
24 #include <string>
25 #include <vector>
26 
27 #include <log/log_id.h>
28 
29 static constexpr int KEEP_LOG_COUNT = 10;
30 
31 struct selabel_handle;
32 
33 struct saved_log_file {
34   std::string name;
35   struct stat sb;
36   std::string data;
37 };
38 
39 void SetLoggingSehandle(selabel_handle* handle);
40 
41 ssize_t logbasename(log_id_t id, char prio, const char* filename, const char* buf, size_t len,
42                     void* arg);
43 
44 ssize_t logrotate(log_id_t id, char prio, const char* filename, const char* buf, size_t len,
45                   void* arg);
46 
47 // Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
48 // Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
49 // Overwrite any existing last_log.$max and last_kmsg.$max.
50 void rotate_logs(const char* last_log_file, const char* last_kmsg_file);
51 
52 // In turn fflush(3)'s, fsync(3)'s and fclose(3)'s the given stream.
53 void check_and_fclose(FILE* fp, const std::string& name);
54 
55 void copy_log_file_to_pmsg(const std::string& source, const std::string& destination);
56 void copy_logs(bool save_current_log);
57 void reset_tmplog_offset();
58 
59 void save_kernel_log(const char* destination);
60 
61 std::vector<saved_log_file> ReadLogFilesToMemory();
62 
63 bool RestoreLogFilesAfterFormat(const std::vector<saved_log_file>& log_files);
64 
65 #endif  //_LOGGING_H
66