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Date:      Tue, 16 Mar 2004 19:39:56 +0300
From:      Roman Bogorodskiy <bogorodskiy@inbox.ru>
To:        freebsd-hackers@freebsd.org
Subject:   kernel modules programming: struct proc question
Message-ID:  <20040316163956.GD638@lame.novel.ru>
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Hi,

	I hope it's a right place for kernel module programming related
questions, in another case I'd be glad if you point me to the right
maillist.=20

So, my aim is to log every file opening in `/tmp' dir. I've wrote a simple
"syscall" module which replaces open(2) syscall. My new open(2) looks
like this:

>---cut 8<---
static int
new_open(struct proc *p, register struct open_args *uap)
{
        char name[NAME_MAX];
	        size_t size;

	if((const void*)copyinstr(uap->path, name,
		NAME_MAX, &size) =3D=3D (const void*)EFAULT)
			                return(EFAULT);

	if (name[0] =3D=3D '/' && name[1] =3D=3D 't' && name[2] =3D=3D 'm'=20
		&& name[3] =3D=3D 'p' && name[4] =3D=3D '/') {
		printf("open(2): %s pid: %i\n", name, (int)p->p_pid);
	}

	return (open(p,	uap));
}

>---cut 9<---<

But instead of a real pid I see something strange in logs, something
like this:

Mar 16 19:15:44 nov kernel: open(2): /tmp/asfdasfsaf pid: -1002890624

What am I doing wrong?=20

-Roman Bogorodskiy


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