Re: new file in kernel.
From: Jan Engelhardt
Date: Sat Jan 19 2008 - 09:30:36 EST
On Jan 19 2008 11:08, Rafael Sisto wrote:
>
>I had already read that webpage, but I dont need to change the data on
>that file. I just want to create a new file and then close it, so I
>can use it later in another system call, to mmap it to a user space.
>Is it clearer now?
>Can you please give me some code snippet?
I don't get what your indirection is supposed to do.
userspace -> sys_open -> kernel space -> create file
-> sys_close -> kernel space -> close it
vs
userspace -> sys_mycall -> kernelspace -> sys_open -> create_file
-> sys_close -> create_file
As for code snippets:
asmlinkage logn sys_mycall(const char __user *filename,
unsigned int flags, unsigned int mode)
{
long ret;
ret = sys_open(filename, flags, mode);
if (ret < 0)
return ret;
return sys_close(fd);
}
You see, this is currently just too trivial to make sense, but if
it helps you, no problem.
>Sorry for the last mail, I answered to your personal mail only)
Here, we use Reply-to-all.
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