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makedev(3c) [opensolaris man page]

makedev(3C)						   Standard C Library Functions 					       makedev(3C)

NAME
makedev, major, minor - manage a device number SYNOPSIS
#include <sys/types.h> #include <sys/mkdev.h> dev_t makedev(major_t maj, minor_t min); major_t major(dev_t device); minor_t minor(dev_t device); DESCRIPTION
The makedev() function returns a formatted device number on success and NODEV on failure. The maj argument is the major number. The min argument is the minor number. The makedev() function can be used to create a device number for input to mknod(2). The major() function returns the major number component from device. The minor() function returns the minor number component from device. RETURN VALUES
Upon successful completion, makedev() returns a formatted device number. Otherwise, NODEV is returned and errno is set to indicate the error. ERRORS
The makedev() function will fail if: EINVAL One or both of the arguments maj and min is too large, or the device number created from maj and min is NODEV. The major() function will fail if: EINVAL The device argument is NODEV, or the major number component of device is too large. The minor() function will fail if: EINVAL The device argument is NODEV. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mknod(2), stat(2), attributes(5) SunOS 5.11 29 Dec 1996 makedev(3C)

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MAKEDEV(3)						     Linux Programmer's Manual							MAKEDEV(3)

NAME
makedev, major, minor - manage a device number SYNOPSIS
#define _BSD_SOURCE #include <sys/types.h> dev_t makedev(int maj, int min); int major(dev_t dev); 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). CONFORMING TO
The makedev() major() and minor() functions are not specified in POSIX.1, but are present on many other systems. NOTES
These interfaces are defined as macros. Since glibc 2.3.3, they have been aliases for three GNU-specific functions: gnu_dev_makedev(3), gnu_dev_major(3), and gnu_dev_minor(3). The latter names are exported, but the traditional names are more portable. SEE ALSO
mknod(2), stat(2) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2008-12-01 MAKEDEV(3)
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