android10/system/core/liblog/config_write.cpp

/*
 * 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_write.h"
#include "logger.h"

struct listnode __android_log_transport_write = {&__android_log_transport_write,
                                                 &__android_log_transport_write};
struct listnode __android_log_persist_write = {&__android_log_persist_write,
                                               &__android_log_persist_write};

static void __android_log_add_transport(struct listnode* list,
                                        struct android_log_transport_write* transport) {
  uint32_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_write* transp;

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

void __android_log_config_write() {
  if ((__android_log_transport == LOGGER_DEFAULT) || (__android_log_transport & LOGGER_LOGD)) {
#if (FAKE_LOG_DEVICE == 0)
    extern struct android_log_transport_write logdLoggerWrite;
    extern struct android_log_transport_write pmsgLoggerWrite;

    __android_log_add_transport(&__android_log_transport_write, &logdLoggerWrite);
    __android_log_add_transport(&__android_log_persist_write, &pmsgLoggerWrite);
#else
    extern struct android_log_transport_write fakeLoggerWrite;

    __android_log_add_transport(&__android_log_transport_write, &fakeLoggerWrite);
#endif
  }

  if (__android_log_transport & LOGGER_STDERR) {
    extern struct android_log_transport_write stderrLoggerWrite;

    /*
     * stderr logger should be primary if we can be the only one, or if
     * already in the primary list.  Otherwise land in the persist list.
     * Remember we can be called here if we are already initialized.
     */
    if (list_empty(&__android_log_transport_write)) {
      __android_log_add_transport(&__android_log_transport_write, &stderrLoggerWrite);
    } else {
      struct android_log_transport_write* transp;
      write_transport_for_each(transp, &__android_log_transport_write) {
        if (transp == &stderrLoggerWrite) {
          return;
        }
      }
      __android_log_add_transport(&__android_log_persist_write, &stderrLoggerWrite);
    }
  }
}

void __android_log_config_write_close() {
  struct android_log_transport_write* transport;
  struct listnode* n;

  write_transport_for_each_safe(transport, n, &__android_log_transport_write) {
    transport->logMask = 0;
    list_remove(&transport->node);
  }
  write_transport_for_each_safe(transport, n, &__android_log_persist_write) {
    transport->logMask = 0;
    list_remove(&transport->node);
  }
}