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Command: makedev | Section: 3 | Source: OpenBSD | File: makedev.3
MAKEDEV(3) FreeBSD Library Functions Manual MAKEDEV(3)
NAME
makedev, major, minor - create or extract device numbers
SYNOPSIS
#include <sys/types.h>
dev_t
makedev(unsigned int maj, unsigned int min);
unsigned int
major(dev_t dev);
unsigned int
minor(dev_t dev);
DESCRIPTION
On OpenBSD, all devices on the system are assigned a unique number which
consists of a major and minor component. Typically, the major number
identifies the kind of device and the minor number identifies a specific
instance of the device.
The makedev() macro is used to combine a major and minor device number
into a form suitable for use with the mknod(2) system call.
The major() macro extracts the major number from the specified device
number.
The minor() macro extracts the minor number from the specified device
number.
RETURN VALUES
The makedev() macro returns a combined device number from the specified
major and minor numbers.
The major() macro returns the major number corresponding to the specified
device number.
The minor() macro returns the minor number corresponding to the specified
device number.
SEE ALSO
mknod(2), intro(4)
STANDARDS
The makedev(), major(), and minor() macros are not standardized by IEEE
Std 1003.1 ("POSIX.1") but are available on most systems.
HISTORY
The makedev(), major(), and minor() macros first appeared in Version 7
AT&T UNIX.
CAVEATS
On some systems, makedev(), major(), and minor() are implemented as
functions rather than macros.
FreeBSD 14.1-RELEASE-p8 January 25, 2019 FreeBSD 14.1-RELEASE-p8