---
name: "debugfs_create_u64"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/debugfs_create_u64"
---

# debugfs\_create\_u64(9)

create a debugfs file that is used to read and write an unsigned 64-bit value

## NAME

debugfs\_create\_u64 - create a debugfs file that is used to read and write an unsigned 64-bit value

## SYNOPSIS

**struct dentry \* debugfs\_create\_u64(const char \*** *name***, umode\_t** *mode***, struct dentry \*** *parent***, u64 \*** *value***);**

## ARGUMENTS

*name*

a pointer to a string containing the name of the file to create.

*mode*

the permission that the file should have

*parent*

a pointer to the parent dentry for this file. This should be a directory dentry if set. If this parameter is **NULL**, then the file will be created in the root of the debugfs filesystem.

*value*

a pointer to the variable that the file should read to and write from.

## DESCRIPTION

This function creates a file in debugfs with the given name that contains the value of the variable *value*. If the *mode* variable is so set, it can be read from, and written to.

This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the **debugfs\_remove** function when the file is to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, **NULL** will be returned.

If debugfs is not enabled in the kernel, the value -**ENODEV** will be returned. It is not wise to check for this value, but rather, check for **NULL** or !**NULL** instead as to eliminate the need for #ifdef in the calling code.

## COPYRIGHT