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DEVNAME(3) Library Functions Manual DEVNAME(3)

get device name

#include <sys/stat.h>
#include <stdlib.h>
char *
devname(dev_t dev, mode_t type);

The devname() function returns a pointer to the name of the block or character device in /dev with a device number of dev, and a file type matching the one encoded in type which must be one of S_IFBLK or S_IFCHR. If no device matches the specified values, or no information is available, a pointer to the string “??” is returned.

stat(2), dev_mkdb(8)

The devname function call appeared in 4.4BSD.
June 5, 2013 OpenBSD-current