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      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 #include <log/log_transport.h>
     18 
     19 #include "config_read.h"
     20 #include "logger.h"
     21 
     22 LIBLOG_HIDDEN struct listnode __android_log_transport_read = {
     23   &__android_log_transport_read, &__android_log_transport_read
     24 };
     25 LIBLOG_HIDDEN struct listnode __android_log_persist_read = {
     26   &__android_log_persist_read, &__android_log_persist_read
     27 };
     28 
     29 static void __android_log_add_transport(
     30     struct listnode* list, struct android_log_transport_read* transport) {
     31   size_t i;
     32 
     33   /* Try to keep one functioning transport for each log buffer id */
     34   for (i = LOG_ID_MIN; i < LOG_ID_MAX; i++) {
     35     struct android_log_transport_read* transp;
     36 
     37     if (list_empty(list)) {
     38       if (!transport->available || ((*transport->available)(i) >= 0)) {
     39         list_add_tail(list, &transport->node);
     40         return;
     41       }
     42     } else {
     43       read_transport_for_each(transp, list) {
     44         if (!transp->available) {
     45           return;
     46         }
     47         if (((*transp->available)(i) < 0) &&
     48             (!transport->available || ((*transport->available)(i) >= 0))) {
     49           list_add_tail(list, &transport->node);
     50           return;
     51         }
     52       }
     53     }
     54   }
     55 }
     56 
     57 LIBLOG_HIDDEN void __android_log_config_read() {
     58   if (__android_log_transport & LOGGER_LOCAL) {
     59     extern struct android_log_transport_read localLoggerRead;
     60 
     61     __android_log_add_transport(&__android_log_transport_read, &localLoggerRead);
     62   }
     63 
     64 #if (FAKE_LOG_DEVICE == 0)
     65   if ((__android_log_transport == LOGGER_DEFAULT) ||
     66       (__android_log_transport & LOGGER_LOGD)) {
     67     extern struct android_log_transport_read logdLoggerRead;
     68     extern struct android_log_transport_read pmsgLoggerRead;
     69 
     70     __android_log_add_transport(&__android_log_transport_read, &logdLoggerRead);
     71     __android_log_add_transport(&__android_log_persist_read, &pmsgLoggerRead);
     72   }
     73 #endif
     74 }
     75 
     76 LIBLOG_HIDDEN void __android_log_config_read_close() {
     77   struct android_log_transport_read* transport;
     78   struct listnode* n;
     79 
     80   read_transport_for_each_safe(transport, n, &__android_log_transport_read) {
     81     list_remove(&transport->node);
     82   }
     83   read_transport_for_each_safe(transport, n, &__android_log_persist_read) {
     84     list_remove(&transport->node);
     85   }
     86 }
     87