83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
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/*
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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 <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <sys/poll.h>
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#include <linux/input.h>
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#include "events.h"
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#define MAX_DEVICES 16
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static struct pollfd ev_fds[MAX_DEVICES];
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static unsigned ev_count = 0;
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int ev_init(void)
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{
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DIR *dir;
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struct dirent *de;
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int fd;
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dir = opendir("/dev/input");
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if(dir != 0) {
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while((de = readdir(dir))) {
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// fprintf(stderr,"/dev/input/%s\n", de->d_name);
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if(strncmp(de->d_name,"event",5)) continue;
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fd = openat(dirfd(dir), de->d_name, O_RDONLY);
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if(fd < 0) continue;
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ev_fds[ev_count].fd = fd;
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ev_fds[ev_count].events = POLLIN;
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ev_count++;
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if(ev_count == MAX_DEVICES) break;
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}
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}
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return 0;
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}
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void ev_exit(void)
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{
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while (ev_count > 0) {
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close(ev_fds[--ev_count].fd);
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}
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}
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int ev_get(struct input_event *ev, unsigned dont_wait)
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{
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int r;
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unsigned n;
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do {
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r = poll(ev_fds, ev_count, dont_wait ? 0 : -1);
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if(r > 0) {
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for(n = 0; n < ev_count; n++) {
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if(ev_fds[n].revents & POLLIN) {
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r = read(ev_fds[n].fd, ev, sizeof(*ev));
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if(r == sizeof(*ev)) return 0;
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}
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}
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}
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} while(dont_wait == 0);
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return -1;
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}
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