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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 struct listnode __android_log_transport_read = {&__android_log_transport_read,
23                                                 &__android_log_transport_read};
24 struct listnode __android_log_persist_read = {&__android_log_persist_read,
25                                               &__android_log_persist_read};
26 
__android_log_add_transport(struct listnode * list,struct android_log_transport_read * transport)27 static void __android_log_add_transport(struct listnode* list,
28                                         struct android_log_transport_read* transport) {
29   uint32_t i;
30 
31   /* Try to keep one functioning transport for each log buffer id */
32   for (i = LOG_ID_MIN; i < LOG_ID_MAX; i++) {
33     struct android_log_transport_read* transp;
34 
35     if (list_empty(list)) {
36       if (!transport->available || ((*transport->available)(static_cast<log_id_t>(i)) >= 0)) {
37         list_add_tail(list, &transport->node);
38         return;
39       }
40     } else {
41       read_transport_for_each(transp, list) {
42         if (!transp->available) {
43           return;
44         }
45         if (((*transp->available)(static_cast<log_id_t>(i)) < 0) &&
46             (!transport->available || ((*transport->available)(static_cast<log_id_t>(i)) >= 0))) {
47           list_add_tail(list, &transport->node);
48           return;
49         }
50       }
51     }
52   }
53 }
54 
__android_log_config_read()55 void __android_log_config_read() {
56 #if (FAKE_LOG_DEVICE == 0)
57   if ((__android_log_transport == LOGGER_DEFAULT) || (__android_log_transport & LOGGER_LOGD)) {
58     extern struct android_log_transport_read logdLoggerRead;
59     extern struct android_log_transport_read pmsgLoggerRead;
60 
61     __android_log_add_transport(&__android_log_transport_read, &logdLoggerRead);
62     __android_log_add_transport(&__android_log_persist_read, &pmsgLoggerRead);
63   }
64 #endif
65 }
66 
__android_log_config_read_close()67 void __android_log_config_read_close() {
68   struct android_log_transport_read* transport;
69   struct listnode* n;
70 
71   read_transport_for_each_safe(transport, n, &__android_log_transport_read) {
72     list_remove(&transport->node);
73   }
74   read_transport_for_each_safe(transport, n, &__android_log_persist_read) {
75     list_remove(&transport->node);
76   }
77 }
78