#include <stdio.h>
#define __USE_GNU
#include <fcntl.h>

int main(void)
{
  int fd;
  FILE *f;

  fd = open("Pfad", O_CREAT | O_EXCL |
            O_NOFOLLOW | O_RDWR, 0600);
  f = fdopen(fd, "w+");
  fprintf(f, "Hallo\n");
  fclose(f); /* schließt auch fd */

  return 0;
}