929f407076
Not just because it's what the cool kids are doing --- it also lets us simplify the inner loop and decouple it from whatever systems want to be woken to perform some activity if there's data to be read on some fd. Currently this is just used to clean up the existing signal handling, keychord, and property service code. Change-Id: I4d7541a2c4386957ad877df69e3be08b96a7dec5
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <linux/keychord.h>
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#include <unistd.h>
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#include "init.h"
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#include "log.h"
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#include "property_service.h"
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static struct input_keychord *keychords = 0;
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static int keychords_count = 0;
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static int keychords_length = 0;
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static int keychord_fd = -1;
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void add_service_keycodes(struct service *svc)
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{
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struct input_keychord *keychord;
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int i, size;
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if (svc->keycodes) {
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/* add a new keychord to the list */
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size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
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keychords = (input_keychord*) realloc(keychords, keychords_length + size);
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if (!keychords) {
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ERROR("could not allocate keychords\n");
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keychords_length = 0;
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keychords_count = 0;
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return;
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}
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keychord = (struct input_keychord *)((char *)keychords + keychords_length);
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keychord->version = KEYCHORD_VERSION;
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keychord->id = keychords_count + 1;
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keychord->count = svc->nkeycodes;
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svc->keychord_id = keychord->id;
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for (i = 0; i < svc->nkeycodes; i++) {
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keychord->keycodes[i] = svc->keycodes[i];
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}
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keychords_count++;
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keychords_length += size;
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}
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}
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static void handle_keychord() {
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struct service *svc;
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char adb_enabled[PROP_VALUE_MAX];
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int ret;
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__u16 id;
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// Only handle keychords if adb is enabled.
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property_get("init.svc.adbd", adb_enabled);
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ret = read(keychord_fd, &id, sizeof(id));
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if (ret != sizeof(id)) {
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ERROR("could not read keychord id\n");
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return;
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}
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if (!strcmp(adb_enabled, "running")) {
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svc = service_find_by_keychord(id);
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if (svc) {
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INFO("Starting service %s from keychord\n", svc->name);
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service_start(svc, NULL);
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} else {
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ERROR("service for keychord %d not found\n", id);
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}
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}
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}
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void keychord_init() {
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service_for_each(add_service_keycodes);
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// Nothing to do if no services require keychords.
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if (!keychords) {
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return;
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}
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keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
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if (keychord_fd == -1) {
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ERROR("could not open /dev/keychord: %s\n", strerror(errno));
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return;
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}
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int ret = write(keychord_fd, keychords, keychords_length);
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if (ret != keychords_length) {
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ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
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close(keychord_fd);
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}
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free(keychords);
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keychords = nullptr;
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register_epoll_handler(keychord_fd, handle_keychord);
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}
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