register_chrdev

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Langue: en

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Version: May 2009 (fedora - 06/07/09)

Section: 9 (Appels noyau Linux)

Sommaire

NAME

register_chrdev - Register a major number for character devices.

SYNOPSIS

int register_chrdev(unsigned int major, const char * name, const struct file_operations * fops);

ARGUMENTS

major

major device number or 0 for dynamic allocation

name

name of this range of devices

fops

file operations associated with this devices

DESCRIPTION

If major == 0 this functions will dynamically allocate a major and return its number.

If major > 0 this function will attempt to reserve a device with the given major number and will return zero on success.

Returns a -ve errno on failure.

The name of this device has nothing to do with the name of the device in /dev. It only helps to keep track of the different owners of devices. If your module name has only one type of devices it's ok to use e.g. the name of the module here.

This function registers a range of 256 minor numbers. The first minor number is 0.