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GETRAWPARTITION(3) Library Functions Manual GETRAWPARTITION(3)

getrawpartition
get the system raw partition

#include <util.h>
int
getrawpartition(void);

getrawpartition() returns the partition number (‘a’ == 0, ‘b’ == 1, ...) of the “raw” partition of the system's disks. The “raw” partition is defined as the partition which provides access to the entire disk, regardless of the disk's partition map.

getmaxpartitions(3), sysctl(2)

The getrawpartition function call appeared in NetBSD 1.2.
January 12, 2018 OpenBSD-current