What is the Linux kernel equivalent to the memset function?

c linux-kernel kernel driver memset
Dr.Knowitall picture Dr.Knowitall · Mar 27, 2012 · Viewed 15.4k times · Source

I'm writing a driver that requires me to clear all the memory allocated to zero. memset is a userspace function, but I would like to know if the kernel provides a macro that helps me do this.

Answer

Chrysanthemumer picture Chrysanthemumer · Mar 29, 2013

It's true memset() in

include <string.h >

not supposed to appear in kernel code.And the fact is it may cost you a lot to trace down where memset() is included during driver development. Actually memset() is defined in 

#include<linux/string.h>

it says:

#ifndef __KERNEL__
#include <string.h>
#else
/* We don't want strings.h stuff being used by user stuff by accident */

Hope this help you type down 'memset()' with 100% sure :)

Related questions

"FATAL: Module not found error" using modprobe

I have a problem with modprobe command... I compiled the hello world module and loaded it with insmod, it works fine and when I do lsmod, I can see it in the output list. But when I insert this module …

Read More
What are vdso and vsyscall?

I did sudo cat /proc/1/maps -vv I am attempting to make sense of the output.I can see a lot of shared libraries being mapped to the memory mapping segment as expected. 7f3c00137000-7f3c00179000 r-xp 00000000 08:01 21233923 /lib/…

Read More
What is the error of "linux unable to handle kernel paging request at ffffffff00000010"?

I have written some Linux kernel code, which causes runtime error, and reports linux unable to handle kernel paging request at ffffffff00000010. It is just a code to hook the open system call in Linux kernel programming. The code is …

Read More