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

/* Toy example.  Real applications use
 * mkstemp() instead. 
 */
int
main()
{
    char name [80], buf[3];
    snprintf(name, sizeof name, 
            "/tmp/tmpfile.%d", getpid());

    int fd = open(name, O_CREAT|O_RDWR|O_TRUNC, 0600);
    assert(fd != -1);
    assert(unlink(name) == 0);
    assert(write(fd, "Hi", 3) == 3);
    assert(lseek(fd, (off_t)0, SEEK_SET) == 0);
    assert(read(fd, buf, 3) == 3);
    assert(strcmp(buf, "Hi") == 0);
    assert(access(name, R_OK) == -1);
    printf("Success. Check if %s exists.\n", name);
    return 0;
}