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apps: Add a little screen utility

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It tells you the resolution of your screen :)
This commit is contained in:
apio 2022-11-02 21:00:23 +01:00
parent 249c79f8a3
commit 7afbff08b6
2 changed files with 33 additions and 1 deletions
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2
apps/Makefile
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@ -1,4 +1,4 @@
APPS := init sh uname uptime hello ps ls args cat stat su session date mkdir
APPS := init sh uname uptime hello ps ls args cat stat su session date mkdir screen
APPS_DIR := $(LUNA_ROOT)/apps
APPS_SRC := $(APPS_DIR)/src

32
apps/src/screen.c Normal file
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@ -0,0 +1,32 @@
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
int main()
{
int fd = open("/dev/fb0", O_WRONLY | O_CLOEXEC);
if(fd < 0)
{
perror("open");
return 1;
}
int fb_width = ioctl(fd, FB_GET_WIDTH);
if(fb_width < 0)
{
perror("ioctl(FB_GET_WIDTH)");
return 1;
}
int fb_height = ioctl(fd, FB_GET_HEIGHT);
if(fb_height < 0)
{
perror("ioctl(FB_GET_HEIGHT)");
return 1;
}
printf("Your screen is %dx%d\n", fb_width, fb_height);
close(fd);
}