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_write.h"
20#include "logger.h"
21
22LIBLOG_HIDDEN struct listnode __android_log_transport_write = {
23  &__android_log_transport_write, &__android_log_transport_write
24};
25LIBLOG_HIDDEN struct listnode __android_log_persist_write = {
26  &__android_log_persist_write, &__android_log_persist_write
27};
28
29static void __android_log_add_transport(
30    struct listnode* list, struct android_log_transport_write* 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_write* 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      write_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_write() {
58  if (__android_log_transport & LOGGER_LOCAL) {
59    extern struct android_log_transport_write localLoggerWrite;
60
61    __android_log_add_transport(&__android_log_transport_write,
62                                &localLoggerWrite);
63  }
64
65  if ((__android_log_transport == LOGGER_DEFAULT) ||
66      (__android_log_transport & LOGGER_LOGD)) {
67#if (FAKE_LOG_DEVICE == 0)
68    extern struct android_log_transport_write logdLoggerWrite;
69    extern struct android_log_transport_write pmsgLoggerWrite;
70
71    __android_log_add_transport(&__android_log_transport_write,
72                                &logdLoggerWrite);
73    __android_log_add_transport(&__android_log_persist_write, &pmsgLoggerWrite);
74#else
75    extern struct android_log_transport_write fakeLoggerWrite;
76
77    __android_log_add_transport(&__android_log_transport_write,
78                                &fakeLoggerWrite);
79#endif
80  }
81
82  if (__android_log_transport & LOGGER_STDERR) {
83    extern struct android_log_transport_write stderrLoggerWrite;
84
85    /*
86     * stderr logger should be primary if we can be the only one, or if
87     * already in the primary list.  Otherwise land in the persist list.
88     * Remember we can be called here if we are already initialized.
89     */
90    if (list_empty(&__android_log_transport_write)) {
91      __android_log_add_transport(&__android_log_transport_write,
92                                  &stderrLoggerWrite);
93    } else {
94      struct android_log_transport_write* transp;
95      write_transport_for_each(transp, &__android_log_transport_write) {
96        if (transp == &stderrLoggerWrite) {
97          return;
98        }
99      }
100      __android_log_add_transport(&__android_log_persist_write,
101                                  &stderrLoggerWrite);
102    }
103  }
104}
105
106LIBLOG_HIDDEN void __android_log_config_write_close() {
107  struct android_log_transport_write* transport;
108  struct listnode* n;
109
110  write_transport_for_each_safe(transport, n, &__android_log_transport_write) {
111    transport->logMask = 0;
112    list_remove(&transport->node);
113  }
114  write_transport_for_each_safe(transport, n, &__android_log_persist_write) {
115    transport->logMask = 0;
116    list_remove(&transport->node);
117  }
118}
119