linux中lcd的设备文件名

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <unistd.h>

int main() {
    int fbfd = open("/dev/fb0", O_RDWR);
    if (fbfd == -1) {
        perror("Error: cannot open framebuffer device");
        exit(1);
    }

    struct fb_var_screeninfo vinfo;
    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
        perror("Error reading variable information");
        exit(3);
    }

    long screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
    char *fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
    if ((int)fbp == -1) {
        perror("Error: failed to map framebuffer device to memory");
        exit(4);
    }

    // Example: Draw a red pixel at (10, 20)
    long location = 10 * vinfo.xres + 20;
    long offset = location * (vinfo.bits_per_pixel / 8);
    *(fbp + offset) = 255;     // Some blue
    *(fbp + offset + 1) = 0;   // Some green
    *(fbp + offset + 2) = 0;   // Some red

    munmap(fbp, screensize);
    close(fbfd);
    return 0;
}