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
22LIBLOG_HIDDEN struct listnode __android_log_transport_read = {
23  &__android_log_transport_read, &__android_log_transport_read
24};
25LIBLOG_HIDDEN struct listnode __android_log_persist_read = {
26  &__android_log_persist_read, &__android_log_persist_read
27};
28
29static 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
57LIBLOG_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
76LIBLOG_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