From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Sat, 24 Oct 2020 10:54:11 +0000 (+0200)
Subject: signal.7: Add reference to seccomp_user_notif(2)
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78aead1121ceb2e1bb19e63d4e430d835037ec45;p=thirdparty%2Fman-pages.git

signal.7: Add reference to seccomp_user_notif(2)

The seccomp user-space notification feature can cause changes in
the semantics of SA_RESTART with respect to system calls that
would never normally be restarted. Point the reader to the page
that provide further details.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---

diff --git a/man7/signal.7 b/man7/signal.7
index 91669145a2..6995e28ed7 100644
--- a/man7/signal.7
+++ b/man7/signal.7
@@ -742,6 +742,15 @@ The
 .BR sleep (3)
 function is also never restarted if interrupted by a handler,
 but gives a success return: the number of seconds remaining to sleep.
+.PP
+In certain circumstances, the
+.BR seccomp (2)
+user-space notification feature can lead to restarting of system calls
+that would otherwise never be restarted by
+.BR SA_RESTART ;
+for details, see
+.BR seccomp_user_notif (2).
+.\"
 .SS Interruption of system calls and library functions by stop signals
 On Linux, even in the absence of signal handlers,
 certain blocking interfaces can fail with the error