?? main.c
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/* * Buttos Example for Matrix IV * * Copyright (C) 2004 capbily - friendly-arm * capbily@hotmail.com */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/ioctl.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/select.h>#include <sys/time.h>#include <errno.h>int main(void){ int buttons_fd; int key_value; buttons_fd = open("/dev/buttons", 0); if (buttons_fd < 0) { perror("open device buttons"); exit(1); } for (;;) { fd_set rds; int ret; FD_ZERO(&rds); FD_SET(buttons_fd, &rds); ret = select(buttons_fd + 1, &rds, NULL, NULL, NULL); if (ret < 0) { perror("select"); exit(1); } if (ret == 0) { printf("Timeout.\n"); } else if (FD_ISSET(buttons_fd, &rds)) { int ret = read(buttons_fd, &key_value, sizeof key_value); if (ret != sizeof key_value) { if (errno != EAGAIN) perror("read buttons\n"); continue; } else { printf("buttons_value: %d\n", key_value); } } } close(buttons_fd); return 0;}?? 快捷鍵說明
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