text: /*
   * Copyright (C) 2010 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 <errno.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <linux/keychord.h>
  #include <unistd.h>
  
  #include "init.h"
  #include "log.h"
  #include "property_service.h"
  
  static struct input_keychord *keychords = 0;
  static int keychords_count = 0;
  static int keychords_length = 0;
  static int keychord_fd = -1;
  
  void add_service_keycodes(struct service *svc)
  {
      struct input_keychord *keychord;
      int i, size;
  
      if (svc->keycodes) {
          /* add a new keychord to the list */
          size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
          keychords = realloc(keychords, keychords_length + size);
          if (!keychords) {
              ERROR("could not allocate keychords\n");
              keychords_length = 0;
              keychords_count = 0;
              return;
          }
  
          keychord = (struct input_keychord *)((char *)keychords + keychords_length);
          keychord->version = KEYCHORD_VERSION;
          keychord->id = keychords_count + 1;
          keychord->count = svc->nkeycodes;
          svc->keychord_id = keychord->id;
  
          for (i = 0; i < svc->nkeycodes; i++) {
              keychord->keycodes[i] = svc->keycodes[i];
          }
          keychords_count++;
          keychords_length += size;
      }
  }
  
  void keychord_init()
  {
      int fd, ret;
  
      service_for_each(add_service_keycodes);
  
      /* nothing to do if no services require keychords */
      if (!keychords)
          return;
  
      fd = open("/dev/keychord", O_RDWR);
      if (fd < 0) {
          ERROR("could not open /dev/keychord\n");
          return;
      }
      fcntl(fd, F_SETFD, FD_CLOEXEC);
  
      ret = write(fd, keychords, keychords_length);
      if (ret != keychords_length) {
          ERROR("could not configure /dev/keychord %d (%d)\n", ret, errno);
          close(fd);
          fd = -1;
      }
  
      free(keychords);
      keychords = 0;
  
      keychord_fd = fd;
  }
  
  void handle_keychord()
  {
      struct service *svc;
      const char* debuggable;
      const char* adb_enabled;
      int ret;
      __u16 id;
  
      // Only handle keychords if adb is enabled.
      adb_enabled = property_get("init.svc.adbd");
      ret = read(keychord_fd, &id, sizeof(id));
      if (ret != sizeof(id)) {
          ERROR("could not read keychord id\n");
          return;
      }
  
      if ((adb_enabled && !strcmp(adb_enabled, "running"))) {
          svc = service_find_by_keychord(id);
          if (svc) {
              INFO("starting service %s from keychord\n", svc->name);
              service_start(svc, NULL);
          } else {
              ERROR("service for keychord %d not found\n", id);
          }
      }
  }
  
  int get_keychord_fd()
  {
      return keychord_fd;
  }
  