Luna/apps/app.c

#include <bits/mmap-flags.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>

void bye()
{
    printf("byeee!\n");
}

int main()
{
    atexit(bye);
    printf("Welcome to %s!\n", "Luna");

    time_t now = time(NULL);
    printf("Realtime clock: %ld s\n", now);

    for (int i = 0; i < atoi("8"); i++) { console_write(".", 1); }

    console_write("\n", 1);

    long rc = syscall(SYS_allocate_memory, 4096, PROT_READ | PROT_WRITE);
    if (rc < 0)
    {
        printf("allocate_memory: %s\n", strerror(-rc));
        return 1;
    }
    char* address = (char*)rc;
    printf("address: %p\n", address);
    printf("memory at address: %c\n", *address);
    *address = 'e';
    printf("memory at address: %c\n", *address);

    syscall(SYS_deallocate_memory, address);
}