[openbeos] Re: memset ---> user_memset ?
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Thu, 07 Sep 2006 11:31:03 +0200 CEST
Siarzhuk Zharski <zharik@xxxxxx> wrote:
> Building my usb_scsi under Haiku I was warned that memset, memcpy
> functions have no prototypes. In KernelExports.h I found only
> user_memset, user_memcpy ones. Are any peculiarities using those mem*
> in
> kernel modules? Should I use user_mem* analogues instead? Are any
> technical details about it somewhere to read? Thanks!
You can still just include <string.h> for those.
The user_*() versions have to be used whenever you're accessing unsafe
user memory. In BeOS, the memory you get in read/write/etc. hooks is
already safe - but the one that got passed into ioctl() never was. Be
never published how to make memory safe, so you can use the user_*()
functions to access it.
Our VM still has some holes with regard to making memory safe, so the
user_*() functions are currently the only way to make sure you can
safely access user memory.
Bye,
Axel.
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