Re: [PATCH] prctl.2: Some additional details regarding PR_GET_UNALIGNED operation

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On 12 December 2016 at 04:54, Eugene Syromyatnikov <evgsyr@xxxxxxxxx> wrote:

Looks like I replied twice to one of your mails, instead of replying
once to each mail. The patch below has been applied.

Cheers,

Michael

> ---
>  man2/prctl.2 | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index 44ec657..5f84bb7 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -1103,20 +1103,27 @@ in the location pointed to by
>  .TP
>  .B PR_SET_UNALIGN
>  (Only on: ia64, since Linux 2.3.48; parisc, since Linux 2.6.15;
> -PowerPC, since Linux 2.6.18; Alpha, since Linux 2.6.22)
> +PowerPC, since Linux 2.6.18; Alpha, since Linux 2.6.22;
> +.\" sh: 94ea5e449ae834af058ef005d16a8ad44fcf13d6
> +.\" tile: 2f9ac29eec71a696cb0dcc5fb82c0f8d4dac28c9
> +sh, since Linux 2.6.34; tile, since Linux 3.12)
>  Set unaligned access control bits to \fIarg2\fP.
>  Pass
>  \fBPR_UNALIGN_NOPRINT\fP to silently fix up unaligned user accesses,
>  or \fBPR_UNALIGN_SIGBUS\fP to generate
>  .B SIGBUS
> -on unaligned user access.
> +on unaligned user access. Alpha also supports an additional flag with the value
> +of 4 and no corresponding named constant, which instructs kernel to not fix up
> +unaligned accesses (it is analogous to providing the
> +.BR UAC_NOFIX " flag in " SSI_NVPAIRS " operation of " setsysinfo
> +syscall on Tru64).
>  .TP
>  .B PR_GET_UNALIGN
>  (see
>  .B PR_SET_UNALIGN
>  for information on versions and architectures)
>  Return unaligned access control bits, in the location pointed to by
> -.IR "(int\ *) arg2" .
> +.IR "(unsigned int\ *) arg2" .
>  .SH RETURN VALUE
>  On success,
>  .BR PR_GET_DUMPABLE ,
> --
> 2.10.2
>



-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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