is memcpy a system call?

Jonathan Neuschäfer j.neuschaefer at
Fri Jun 8 17:48:15 EDT 2012

On Sat, Jun 09, 2012 at 12:11:36AM +0900, J.Hwan Kim wrote:
> Hi, everyone
> Is memcpy a system call?
> Thanks in advnace,
> Best Regards,
> J.Hwna Kim

"strace" is a good tool to find out which system calls a program is

To answer your question, I don't think it makes much sense to implement
memcpy as a syscall, because entering kernel mode is usually relatively
expensive and I can't think of any kernel mode-only memcpy optimizations
(and optimizations are the only reason to do a user space memcpy in
kernel space I can think of).

	Jonathan Neuschäfer

More information about the Kernelnewbies mailing list