?? main.c
字號(hào):
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/ioctl.h>int main(int argc, char **argv){ int on; int led_no; int fd; if (argc != 3 || sscanf(argv[1], "%d", &led_no) != 1 || sscanf(argv[2],"%d", &on) != 1 || on < 0 || on > 1 || led_no < 0 || led_no > 3) { fprintf(stderr, "Usage: leds led_no 0|1\n"); exit(1); } fd = open("/dev/leds", 0); if (fd < 0) { perror("open device leds"); exit(1); } ioctl(fd, on, led_no); close(fd); return 0;}
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -