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DEVNAME(3) Library Functions Manual DEVNAME(3)

get device name

library “libc”

#include <stdlib.h>
#include <sys/stat.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, NULL is returned.

The traditional display for applications when no device is found is the string “??”.

Device database file.

stat(2), dev_mkdb(8)

The devname function call appeared in 4.4BSD.
June 3, 2012 NetBSD-7.0.1