#include <stdio.h>
#include <assert.h>
#include <fcntl.h>

int
main()
{
    int fd = creat("a file", 0600);
    int fd2 = open("a file", O_RDONLY);
    write(fd, "hi", 2);

    char buf[3]; 
    read(fd2, buf, 2);
    buf[2] = '\0';
    
    assert(strcmp(buf, "hi") == 0);
}