platform_system_core/liblog/config_read.c

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <log/log_transport.h>

#include "config_read.h"
#include "logger.h"

LIBLOG_HIDDEN struct listnode __android_log_transport_read = {
  &__android_log_transport_read, &__android_log_transport_read
};
LIBLOG_HIDDEN struct listnode __android_log_persist_read = {
  &__android_log_persist_read, &__android_log_persist_read
};

static void __android_log_add_transport(
    struct listnode* list, struct android_log_transport_read* transport) {
  size_t i;

  /* Try to keep one functioning transport for each log buffer id */
  for (i = LOG_ID_MIN; i < LOG_ID_MAX; i++) {
    struct android_log_transport_read* transp;

    if (list_empty(list)) {
      if (!transport->available || ((*transport->available)(i) >= 0)) {
        list_add_tail(list, &transport->node);
        return;
      }
    } else {
      read_transport_for_each(transp, list) {
        if (!transp->available) {
          return;
        }
        if (((*transp->available)(i) < 0) &&
            (!transport->available || ((*transport->available)(i) >= 0))) {
          list_add_tail(list, &transport->node);
          return;
        }
      }
    }
  }
}

LIBLOG_HIDDEN void __android_log_config_read() {
  if (__android_log_transport & LOGGER_LOCAL) {
    extern struct android_log_transport_read localLoggerRead;

    __android_log_add_transport(&__android_log_transport_read, &localLoggerRead);
  }

#if (FAKE_LOG_DEVICE == 0)
  if ((__android_log_transport == LOGGER_DEFAULT) ||
      (__android_log_transport & LOGGER_LOGD)) {
    extern struct android_log_transport_read logdLoggerRead;
    extern struct android_log_transport_read pmsgLoggerRead;

    __android_log_add_transport(&__android_log_transport_read, &logdLoggerRead);
    __android_log_add_transport(&__android_log_persist_read, &pmsgLoggerRead);
  }
#endif
}

LIBLOG_HIDDEN void __android_log_config_read_close() {
  struct android_log_transport_read* transport;
  struct listnode* n;

  read_transport_for_each_safe(transport, n, &__android_log_transport_read) {
    list_remove(&transport->node);
  }
  read_transport_for_each_safe(transport, n, &__android_log_persist_read) {
    list_remove(&transport->node);
  }
}