Sponsored Content
Full Discussion: major & minor number
Operating Systems Solaris major & minor number Post 53630 by Perderabo on Wednesday 21st of July 2004 06:45:41 AM
Old 07-21-2004
There are several different drivers in a system. For example if your system has a disk drive and tape drive, there would be one driver for the disk and another driver for the tape drive. Each driver gets a number called the major number. The major number just tells the kernel which driver to use.

The minor number is passed to the driver. The driver could ignore it. Or the driver can interpret any way it wants. Usually there are sub fields in the minor number. In the case of a tape driver, one sub field would say which particular tape drive to use. Another sub field might say whether or not to automatically rewind the tape when the file is closed.
 

9 More Discussions You Might Find Interesting

1. Programming

Device Major/Minor numbers

To further my fledgling knowledge of C, I am re-writing some of the Unix command set. My current command is an ls-style command. All works well, except for device files. How do I get the major/minor numbers for the dev files? I see from the stat struct there are st_rdev and st_dev members. Do... (1 Reply)
Discussion started by: zazzybob
1 Replies

2. Shell Programming and Scripting

sort major.minor.release_build_x

would like to order this input based on major.minor.release AND build number Label abc_def_0.0.3_build_999 2008/08/01 'Created by me.' Label abc_def_0.0.9_build_1000 2008/08/01 'Created by me.' Label abc_def_9.0.9_build_10001 2008/08/01 'Created by me.' Label abc_def_10.9.100_build_2... (4 Replies)
Discussion started by: gurpal2000
4 Replies

3. Solaris

Help with Major and minor number

Hi Does anyone know what the major and minor numbers are in Solaris? (2 Replies)
Discussion started by: wisdom
2 Replies

4. AIX

how do I change major-minor numbers of disk devices

Good evening ... does anyone of you know how to change major/minor numbers of disk devices ? I had to migrate from raid1 to raid5 and this messed up my ASM cluster - I know which devices should have which IDs to match the content - but I have no idea how to change it. Any help would be... (2 Replies)
Discussion started by: zxmaus
2 Replies

5. AIX

Difference between Major and Minor in AIX

Difference between Major and Minor in AIX (5 Replies)
Discussion started by: AIXlearner
5 Replies

6. Programming

which head file for major and minor function?

#include <sys/types.h> #include <sys/stat.h> #include <sys/termios.h> #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <string.h> #include <unistd.h> #include <signal.h> #include <sys/mkdev.h> int main(int argc, char *argv) { int i; struct stat buf; ... (4 Replies)
Discussion started by: konvalo
4 Replies

7. Shell Programming and Scripting

How to filter out major and minor?

Hi, I have line like this : proj_name/module/trunk/module_1_0 where the first "1" refers to major version and second "0" refers to minor version. any AWK or command like that so that I can filter out the major and minor ? like major= command | input line minor= command |... (4 Replies)
Discussion started by: bhaskar_m
4 Replies

8. Solaris

Major and Minor number of Virtual File System

Hi friends, Please let me know if there is any way to find out Major and Minor numbers of virtual file system like below: /devices 0K 0K 0K 0% /devices ctfs 0K 0K 0K 0% /system/contract proc 0K 0K ... (8 Replies)
Discussion started by: nitj
8 Replies

9. Shell Programming and Scripting

Filtering my major and minor values

I want to remove all rows with a minor repeating count less than 30% compared to the major repeating count from my table. The values of a col(starting col 2) can assume is A,T,G,C and N. Each row has at least 2 values and at most 4 repeating values(out of ATGC). N is considered a missing value... (12 Replies)
Discussion started by: newbie83
12 Replies
MAKEDEV(3)						     Linux Programmer's Manual							MAKEDEV(3)

NAME
makedev, major, minor - manage a device number SYNOPSIS
#define _BSD_SOURCE /* See feature_test_macros(7) */ #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 3.27 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 2010-09-10 MAKEDEV(3)
All times are GMT -4. The time now is 10:31 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy