1/* 2 * Copyright (C) 2010 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 "keychords.h" 18 19#include <fcntl.h> 20#include <stdlib.h> 21#include <sys/stat.h> 22#include <sys/types.h> 23#include <linux/keychord.h> 24#include <unistd.h> 25 26#include <android-base/logging.h> 27#include <android-base/properties.h> 28 29#include "init.h" 30 31namespace android { 32namespace init { 33 34static struct input_keychord *keychords = 0; 35static int keychords_count = 0; 36static int keychords_length = 0; 37static int keychord_fd = -1; 38 39void add_service_keycodes(Service* svc) 40{ 41 struct input_keychord *keychord; 42 size_t i, size; 43 44 if (!svc->keycodes().empty()) { 45 /* add a new keychord to the list */ 46 size = sizeof(*keychord) + svc->keycodes().size() * sizeof(keychord->keycodes[0]); 47 keychords = (input_keychord*) realloc(keychords, keychords_length + size); 48 if (!keychords) { 49 PLOG(ERROR) << "could not allocate keychords"; 50 keychords_length = 0; 51 keychords_count = 0; 52 return; 53 } 54 55 keychord = (struct input_keychord *)((char *)keychords + keychords_length); 56 keychord->version = KEYCHORD_VERSION; 57 keychord->id = keychords_count + 1; 58 keychord->count = svc->keycodes().size(); 59 svc->set_keychord_id(keychord->id); 60 61 for (i = 0; i < svc->keycodes().size(); i++) { 62 keychord->keycodes[i] = svc->keycodes()[i]; 63 } 64 keychords_count++; 65 keychords_length += size; 66 } 67} 68 69static void handle_keychord() { 70 int ret; 71 __u16 id; 72 73 ret = read(keychord_fd, &id, sizeof(id)); 74 if (ret != sizeof(id)) { 75 PLOG(ERROR) << "could not read keychord id"; 76 return; 77 } 78 79 // Only handle keychords if adb is enabled. 80 std::string adb_enabled = android::base::GetProperty("init.svc.adbd", ""); 81 if (adb_enabled == "running") { 82 Service* svc = ServiceManager::GetInstance().FindServiceByKeychord(id); 83 if (svc) { 84 LOG(INFO) << "Starting service " << svc->name() << " from keychord " << id; 85 svc->Start(); 86 } else { 87 LOG(ERROR) << "Service for keychord " << id << " not found"; 88 } 89 } else { 90 LOG(WARNING) << "Not starting service for keychord " << id << " because ADB is disabled"; 91 } 92} 93 94void keychord_init() { 95 ServiceManager::GetInstance().ForEachService(add_service_keycodes); 96 97 // Nothing to do if no services require keychords. 98 if (!keychords) { 99 return; 100 } 101 102 keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC)); 103 if (keychord_fd == -1) { 104 PLOG(ERROR) << "could not open /dev/keychord"; 105 return; 106 } 107 108 int ret = write(keychord_fd, keychords, keychords_length); 109 if (ret != keychords_length) { 110 PLOG(ERROR) << "could not configure /dev/keychord " << ret; 111 close(keychord_fd); 112 } 113 114 free(keychords); 115 keychords = nullptr; 116 117 register_epoll_handler(keychord_fd, handle_keychord); 118} 119 120} // namespace init 121} // namespace android 122