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      1 /*
      2  * Copyright (C) 2015 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 <errno.h>
     18 #include <stdarg.h>
     19 
     20 #include <string>
     21 
     22 #include <android-base/stringprintf.h>
     23 #include <log/log.h>
     24 
     25 // Forward declarations.
     26 class Backtrace;
     27 struct EventTagMap;
     28 struct AndroidLogEntry;
     29 
     30 std::string g_fake_log_buf;
     31 
     32 std::string g_fake_log_print;
     33 
     34 void resetLogs() {
     35   g_fake_log_buf = "";
     36   g_fake_log_print = "";
     37 }
     38 
     39 std::string getFakeLogBuf() {
     40   return g_fake_log_buf;
     41 }
     42 
     43 std::string getFakeLogPrint() {
     44   return g_fake_log_print;
     45 }
     46 
     47 extern "C" int async_safe_format_log(int priority, const char* tag, const char* format, ...) {
     48   g_fake_log_print += std::to_string(priority) + ' ' + tag + ' ';
     49 
     50   va_list ap;
     51   va_start(ap, format);
     52   android::base::StringAppendV(&g_fake_log_print, format, ap);
     53   va_end(ap);
     54 
     55   g_fake_log_print += '\n';
     56 
     57   return 0;
     58 }
     59 
     60 extern "C" int async_safe_write_log(int priority, const char* tag, const char* msg) {
     61   g_fake_log_print += std::to_string(priority) + ' ' + tag + ' ' + msg + '\n';
     62 
     63   return 0;
     64 }
     65 
     66 extern "C" int __android_log_buf_write(int bufId, int prio, const char* tag, const char* msg) {
     67   g_fake_log_buf += std::to_string(bufId) + ' ' + std::to_string(prio) + ' ';
     68   g_fake_log_buf += tag;
     69   g_fake_log_buf += ' ';
     70   g_fake_log_buf += msg;
     71   return 1;
     72 }
     73 
     74 extern "C" int __android_log_print(int prio, const char* tag, const char* fmt, ...) {
     75   g_fake_log_print += std::to_string(prio) + ' ';
     76   g_fake_log_print += tag;
     77   g_fake_log_print += ' ';
     78 
     79   va_list ap;
     80   va_start(ap, fmt);
     81   android::base::StringAppendV(&g_fake_log_print, fmt, ap);
     82   va_end(ap);
     83 
     84   g_fake_log_print += '\n';
     85 
     86   return 1;
     87 }
     88 
     89 extern "C" log_id_t android_name_to_log_id(const char*) {
     90   return LOG_ID_SYSTEM;
     91 }
     92 
     93 extern "C" struct logger_list* android_logger_list_open(log_id_t, int, unsigned int, pid_t) {
     94   errno = EACCES;
     95   return nullptr;
     96 }
     97 
     98 extern "C" int android_logger_list_read(struct logger_list*, struct log_msg*) {
     99   return 0;
    100 }
    101 
    102 extern "C" EventTagMap* android_openEventTagMap(const char*) {
    103   return nullptr;
    104 }
    105 
    106 extern "C" int android_log_processBinaryLogBuffer(
    107     struct logger_entry*,
    108     AndroidLogEntry*, const EventTagMap*, char*, int) {
    109   return 0;
    110 }
    111 
    112 extern "C" void android_logger_list_free(struct logger_list*) {
    113 }
    114