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