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/*
* 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 = (input_keychord*) 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;
}
}
static void handle_keychord() {
struct service *svc;
char adb_enabled[PROP_VALUE_MAX];
int ret;
__u16 id;
// Only handle keychords if adb is enabled.
property_get("init.svc.adbd", adb_enabled);
ret = read(keychord_fd, &id, sizeof(id));
if (ret != sizeof(id)) {
ERROR("could not read keychord id\n");
return;
}
if (!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);
}
}
}
void keychord_init() {
service_for_each(add_service_keycodes);
// Nothing to do if no services require keychords.
if (!keychords) {
return;
}
keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
if (keychord_fd == -1) {
ERROR("could not open /dev/keychord: %s\n", strerror(errno));
return;
}
int ret = write(keychord_fd, keychords, keychords_length);
if (ret != keychords_length) {
ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
close(keychord_fd);
}
free(keychords);
keychords = nullptr;
register_epoll_handler(keychord_fd, handle_keychord);
}
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