Linux cli command makedev

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command makedev and provides detailed information about the command makedev, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the makedev.

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NAME 🖥️ makedev 🖥️

manage a device number

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <sys/sysmacros.h>
dev_t makedev(unsigned int maj, unsigned int min);
unsigned int major(dev_t dev);
unsigned int minor(dev_t dev);

DESCRIPTION

A device ID consists of two parts: a major ID, identifying the class of the device, and a minor ID, identifying a specific instance of a device in that class. A device ID is represented using the type dev_t.

Given major and minor device IDs, makedev() combines these to produce a device ID, returned as the function result. This device ID can be given to mknod(2), for example.

The major() and minor() functions perform the converse task: given a device ID, they return, respectively, the major and minor components. These macros can be useful to, for example, decompose the device IDs in the structure returned by stat(2).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue

makedev(), major(), minor()

Thread safetyMT-Safe

VERSIONS

The BSDs expose the definitions for these macros via <sys/types.h>.

STANDARDS

None.

HISTORY

BSD, HP-UX, Solaris, AIX, Irix.

These interfaces are defined as macros. Since glibc 2.3.3, they have been aliases for three GNU-specific functions: gnu_dev_makedev(), gnu_dev_major(), and gnu_dev_minor(). The latter names are exported, but the traditional names are more portable.

Depending on the version, glibc also exposes definitions for these macros from <sys/types.h> if suitable feature test macros are defined. However, this behavior was deprecated in glibc 2.25, and since glibc 2.28, <sys/types.h> no longer provides these definitions.

SEE ALSO

mknod(2), stat(2)

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