[PATCH 2/2] seccomp.2: document userspace notification

Michael Kerrisk (man-pages) mtk.manpages at gmail.com
Fri Mar 1 15:16:27 UTC 2019

Hello Tycho,

On 3/1/19 3:53 PM, Tycho Andersen wrote:
> On Thu, Feb 28, 2019 at 01:52:19PM +0100, Michael Kerrisk (man-pages) wrote:
>>> +a notification will be sent to this fd. See "Userspace Notification" below for
>> s/fd/file descriptor/ throughout please.
> Will do.
>>> +more details.
>> I think the description here could be better worded as something like:
>>         Register a new filter, as usual, but on success return a
>>         new file descriptor that provides user-space notifications.
>>         When the filter returns SECCOMP_RET_USER_NOTIF, a notification
>>         will be provided via this file descriptor. The close-on-exec
>>         flag is automatically set on the new file descriptor. ...
>>>  .RE
>>>  .TP
>>>  .BR SECCOMP_GET_ACTION_AVAIL " (since Linux 4.14)"
>>> @@ -606,6 +613,17 @@ file.
>>>  .TP
>>>  This value results in the system call being executed.
>>> +.TP
>>> +.BR SECCOMP_RET_USER_NOTIF " (since Linux 4.21)"
>> Please see the start of this hanging list in the manual page.
>> Can you confirm that SECCOMP_RET_USER_NOTIF really is the lowest
>> in the precedence order of all of the filter return values?
> Oh, no, I didn't realize it was in a particular order. I'll switch it.

Just for my immediate education (I'm experimenting right now),
where/how does it fit in the precedence order?



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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