Luna/apps/hello.c

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <unistd.h>

int main()
{
    printf("Hello world!\n");

    mkdir("/dev", 0755);
    if (syscall(SYS_mknod, "/dev/console", 0666, makedev(1, 0)) < 0)
    {
        perror("mknod");
        return 1;
    }

    const char* str = "Hello from /dev!";

    FILE* f = fopen("/dev/console", "r+");
    fwrite(str, 1, strlen(str), f);
    if (f) fclose(f);
}