* [Bug 134971] New: Clarify kill(2) man-page for permission to "send" signal 0
@ 2016-07-15 2:50 bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
[not found] ` <bug-134971-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
0 siblings, 1 reply; 3+ messages in thread
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r @ 2016-07-15 2:50 UTC (permalink / raw)
To: linux-man-u79uwXL29TY76Z2rM5mHXA
https://bugzilla.kernel.org/show_bug.cgi?id=134971
Bug ID: 134971
Summary: Clarify kill(2) man-page for permission to "send"
signal 0
Product: Documentation
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: enhancement
Priority: P1
Component: man-pages
Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
Reporter: jrw32982-/E1597aS9LQAvxtiuMwx3w@public.gmane.org
Regression: No
The description of errors relating to signal 0 leaves room for
misinterpretation.
The kill(2) man-page says that for signal 0, no signal is sent, mentions that
error checking is performed and that signal 0 can be used to check for process
existence. Then it says the a process must have perms to send a signal.
Later, for EPERM, it says that the process doesn't have perms to send the
signal.
But for signal 0, no signal is sent. What's not 100% clear is that, *even for
signal 0*, a process must have perms (CAP_KILL or matching user ID). I
misinterpreted it to mean that any process could send signal 0 to any other
process (regardless of user ID), but could not send a non-zero signal to a
process without the appropriate perms. But this is wrong. The reason for the
confusion is the word "send/sent" not being used 100% consistently.
Maybe the wording could be enhanced to say "For a process to have permission to
send a signal, including signal 0, it must either be ...".
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug 134971] Clarify kill(2) man-page for permission to "send" signal 0
[not found] ` <bug-134971-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
@ 2016-07-16 10:24 ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2016-07-16 13:12 ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
1 sibling, 0 replies; 3+ messages in thread
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r @ 2016-07-16 10:24 UTC (permalink / raw)
To: linux-man-u79uwXL29TY76Z2rM5mHXA
https://bugzilla.kernel.org/show_bug.cgi?id=134971
Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Resolution|--- |CODE_FIX
--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Hello John,
I agree the page could be clearer. What I did was change the paragraph
describing sig==0 to:
If sig is 0, then no signal is sent, but existence and permission
checks are still performed; this can be used to check for the
existence of a process ID or process group ID that the caller is
permitted to signal.
I believe that makes the point clear, so I'll close this for now. Please reopen
if you think there's still a problem.
Thanks,
Michael
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug 134971] Clarify kill(2) man-page for permission to "send" signal 0
[not found] ` <bug-134971-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
2016-07-16 10:24 ` [Bug 134971] " bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
@ 2016-07-16 13:12 ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
1 sibling, 0 replies; 3+ messages in thread
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r @ 2016-07-16 13:12 UTC (permalink / raw)
To: linux-man-u79uwXL29TY76Z2rM5mHXA
https://bugzilla.kernel.org/show_bug.cgi?id=134971
--- Comment #2 from John Wiersba <jrw32982-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> ---
Thanks, Michael! That does make it clearer!
From: "bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org"
<bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org>
To: jrw32982-/E1597aS9LQAvxtiuMwx3w@public.gmane.org
Sent: Saturday, July 16, 2016 6:24 AM
Subject: [Bug 134971] Clarify kill(2) man-page for permission to "send" signal
0
https://bugzilla.kernel.org/show_bug.cgi?id=134971
Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Resolution|--- |CODE_FIX
--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Hello John,
I agree the page could be clearer. What I did was change the paragraph
describing sig==0 to:
If sig is 0, then no signal is sent, but existence and permission
checks are still performed; this can be used to check for the
existence of a process ID or process group ID that the caller is
permitted to signal.
I believe that makes the point clear, so I'll close this for now. Please reopen
if you think there's still a problem.
Thanks,
Michael
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2016-07-15 2:50 [Bug 134971] New: Clarify kill(2) man-page for permission to "send" signal 0 bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
[not found] ` <bug-134971-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
2016-07-16 10:24 ` [Bug 134971] " bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2016-07-16 13:12 ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
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