Does fopen create a file descriptor?
On Unix (which I assume you're using because you're mentioning fcntl) it does open a file descriptor, as fopen(3) eventually calls open(2). You can get that file descriptor via fileno(3).
On Unix (which I assume you're using because you're mentioning fcntl) it does open a file descriptor, as fopen(3) eventually calls open(2). You can get that file descriptor via fileno(3).