Re: The time has come for a kernel interfacing library layer

[davidxu <davidxu@xxxxxxxxxxx>]

Matthew Dillon wrote:
>     Joerg, does this look ok as an extension to tls_tcb ?  I also added
>     some pad to reduce compat headaches in the future.
>
>     We then need to add the code to assign tcb_errno_p during initial
>     and new TCB creation.
>
>     I've got the syscall generation infrastructure almost done.  I just
>     need to copy the exceptional cases (e.g. fork(), rfork()) from libc.
>
> 					-Matt
>
> Index: tls.h
> ===================================================================
> RCS file: /cvs/src/sys/i386/include/tls.h,v
> retrieving revision 1.3
> diff -u -r1.3 tls.h
> --- tls.h	3 May 2005 18:25:13 -0000	1.3
> +++ tls.h	8 May 2005 03:34:57 -0000
> @@ -41,6 +41,8 @@
>  	struct tls_tcb *tcb_self;	/* pointer to self*/
>  	void *tcb_dtv;			/* Dynamic Thread Vector */
>  	void *tcb_pthread;		/* thread library's data*/
> +	int *tcb_errno_p;		/* pointer to errno or NULL */
> +	void *tcb_unused[4];
>  };
>  
>  struct tls_dtv {

Do you mean kernel will directly write errno into userland memory?