/*
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* Copyright (C) 2007 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 <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <functional>
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#include <memory>
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#include <android-base/unique_fd.h>
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#include <android-base/logging.h>
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#include "minui/minui.h"
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constexpr size_t MAX_DEVICES = 16;
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constexpr size_t MAX_MISC_FDS = 16;
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constexpr size_t BITS_PER_LONG = sizeof(unsigned long) * 8;
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constexpr size_t BITS_TO_LONGS(size_t bits) {
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return ((bits + BITS_PER_LONG - 1) / BITS_PER_LONG);
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}
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struct FdInfo {
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android::base::unique_fd fd;
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ev_callback cb;
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};
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static android::base::unique_fd g_epoll_fd;
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static epoll_event g_polled_events[MAX_DEVICES + MAX_MISC_FDS];
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static int g_polled_events_count;
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static FdInfo ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
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static size_t g_ev_count = 0;
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static size_t g_ev_dev_count = 0;
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static size_t g_ev_misc_count = 0;
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static bool test_bit(size_t bit, unsigned long* array) { // NOLINT
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return (array[bit / BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
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}
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int ev_init(ev_callback input_cb, bool allow_touch_inputs) {
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g_epoll_fd.reset();
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ev_set_callback(input_cb);
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android::base::unique_fd epoll_fd(epoll_create1(EPOLL_CLOEXEC));
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if (epoll_fd == -1) {
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return -1;
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}
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std::unique_ptr<DIR, decltype(&closedir)> dir(opendir("/dev/input"), closedir);
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if (!dir) {
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return -1;
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}
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bool epoll_ctl_failed = false;
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dirent* de;
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while ((de = readdir(dir.get())) != nullptr) {
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if (strncmp(de->d_name, "event", 5)) continue;
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android::base::unique_fd fd(openat(dirfd(dir.get()), de->d_name, O_RDONLY | O_CLOEXEC));
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if (fd == -1) continue;
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// Use unsigned long to match ioctl's parameter type.
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
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// Read the evbits of the input device.
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if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
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continue;
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}
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// We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed. EV_ABS is also
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// allowed if allow_touch_inputs is set.
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if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
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if (!allow_touch_inputs || !test_bit(EV_ABS, ev_bits)) {
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continue;
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}
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}
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epoll_event ev;
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ev.events = EPOLLIN | EPOLLWAKEUP;
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ev.data.ptr = &ev_fdinfo[g_ev_count];
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if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
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epoll_ctl_failed = true;
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continue;
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}
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ev_fdinfo[g_ev_count].fd.reset(fd.release());
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ev_fdinfo[g_ev_count].cb = input_cb;
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g_ev_count++;
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g_ev_dev_count++;
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if (g_ev_dev_count == MAX_DEVICES) break;
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}
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if (epoll_ctl_failed && !g_ev_count) {
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return -1;
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}
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g_epoll_fd.reset(epoll_fd.release());
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return 0;
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}
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int ev_get_epollfd(void) {
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return g_epoll_fd.get();
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}
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int ev_add_fd(android::base::unique_fd&& fd, ev_callback cb) {
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if (g_ev_misc_count == MAX_MISC_FDS || cb == nullptr) {
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return -1;
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}
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epoll_event ev;
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ev.events = EPOLLIN | EPOLLWAKEUP;
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ev.data.ptr = static_cast<void*>(&ev_fdinfo[g_ev_count]);
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int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
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if (!ret) {
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ev_fdinfo[g_ev_count].fd.reset(fd.release());
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ev_fdinfo[g_ev_count].cb = std::move(cb);
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g_ev_count++;
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g_ev_misc_count++;
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}
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return ret;
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}
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void ev_exit(void) {
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while (g_ev_count > 0) {
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ev_fdinfo[--g_ev_count].fd.reset();
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}
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g_ev_misc_count = 0;
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g_ev_dev_count = 0;
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g_epoll_fd.reset();
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}
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void ev_set_callback(ev_callback cb) {
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input_cb_save = cb;
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}
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int ev_create_inotify() {
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if ((ifd = inotify_init()) < 0) {
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PLOG(ERROR) << "inotify_init failed";
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return -1;
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}
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wfd = inotify_add_watch(ifd, "/dev/input", IN_CREATE);
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if (wfd < 0) {
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PLOG(ERROR) << "inotify_add_watch failed";
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return -1;
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}
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return 0;
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}
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int ev_listen(void) {
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int eventnum, length;
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fd_set readset;
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char buffer[512];
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int event_pos = 0;
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struct inotify_event *event;
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char ne_path[20];
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int new_fd;
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FD_ZERO(&readset);
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FD_SET(ifd, &readset);
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eventnum = select(ifd + 1, &readset, NULL, NULL, NULL);
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if (eventnum > 0) {
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if (FD_ISSET(ifd, &readset))
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length = read(ifd, buffer, sizeof(buffer));
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else {
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PLOG(ERROR) << "FD_ISSET failed";
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return -1;
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}
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while ((length >= (int)sizeof(*event)) && (event_pos < length)) {
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event = (struct inotify_event *)(buffer + event_pos);
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if (event->len) {
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if (event->mask & IN_CREATE) {
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if (strncmp(event->name, "event", 5)) {
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event_pos += (int)sizeof(*event) + event->len;
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continue;
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}
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snprintf(ne_path, sizeof(ne_path), "/dev/input/%s", event->name);
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PLOG(ERROR) << " ne_path = " << ne_path;
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new_fd = open(ne_path, O_RDONLY);
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if (new_fd < 0) {
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PLOG(ERROR) << "open failed failed :" << ne_path;
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return -1;
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}
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if (ev_add_fd(android::base::unique_fd(new_fd), input_cb_save)) {
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PLOG(ERROR) << "ev_add_fd error";
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return -1;
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}
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PLOG(ERROR) << "add a new device :" << ne_path;
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}
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event_pos += (int)sizeof(*event) + event->len;
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} else {
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PLOG(ERROR) << "get inotify event error";
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}
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}
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}
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return 0;
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}
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int ev_wait(int timeout) {
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g_polled_events_count = epoll_wait(g_epoll_fd, g_polled_events, g_ev_count, timeout);
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if (g_polled_events_count <= 0) {
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return -1;
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}
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return 0;
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}
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void ev_dispatch(void) {
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for (int n = 0; n < g_polled_events_count; n++) {
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FdInfo* fdi = static_cast<FdInfo*>(g_polled_events[n].data.ptr);
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const ev_callback& cb = fdi->cb;
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if (cb) {
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cb(fdi->fd, g_polled_events[n].events);
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}
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}
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}
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int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
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if (epevents & EPOLLIN) {
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ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
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if (r == sizeof(*ev)) {
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return 0;
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}
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}
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return -1;
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}
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int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
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// Use unsigned long to match ioctl's parameter type.
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
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unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
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for (size_t i = 0; i < g_ev_dev_count; ++i) {
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memset(ev_bits, 0, sizeof(ev_bits));
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memset(key_bits, 0, sizeof(key_bits));
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if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
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continue;
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}
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if (!test_bit(EV_KEY, ev_bits)) {
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continue;
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}
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if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
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continue;
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}
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for (int code = 0; code <= KEY_MAX; code++) {
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if (test_bit(code, key_bits)) {
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set_key_cb(code, 1);
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}
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}
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}
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return 0;
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}
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void ev_iterate_available_keys(const std::function<void(int)>& f) {
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// Use unsigned long to match ioctl's parameter type.
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
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unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
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for (size_t i = 0; i < g_ev_dev_count; ++i) {
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memset(ev_bits, 0, sizeof(ev_bits));
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memset(key_bits, 0, sizeof(key_bits));
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// Does this device even have keys?
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if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
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continue;
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}
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if (!test_bit(EV_KEY, ev_bits)) {
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continue;
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}
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if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits) == -1) {
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continue;
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}
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for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
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if (test_bit(key_code, key_bits)) {
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f(key_code);
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}
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}
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}
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}
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void ev_iterate_touch_inputs(const std::function<void(int)>& action) {
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for (size_t i = 0; i < g_ev_dev_count; ++i) {
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// Use unsigned long to match ioctl's parameter type.
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {}; // NOLINT
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if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
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continue;
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}
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if (!test_bit(EV_ABS, ev_bits)) {
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continue;
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}
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unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {}; // NOLINT
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if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) {
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continue;
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}
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for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
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if (test_bit(key_code, key_bits)) {
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action(key_code);
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}
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}
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}
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}
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