User-space API to inquire block alignment requirements for open file descriptor?

[Poul-Henning Kamp]

--------
In message <c9063edd-a3c1-fce4-483c-a192addc6b86 at FreeBSD.org>, Matthias Andree 
writes:
>Greetings,
>
>given an open file descriptor, do we have a system interface to inquire
>about the block size of the underlying devices? In the past, we used to
>deal with 512-byte blocks, but how about drives using 4096-byte blocks?

DIOCGSECTORSIZE in sys/disk.h

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