signalfd.2: Describe semantics with respect to SCM_RIGHTS

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

diff --git a/man2/signalfd.2 b/man2/signalfd.2
index e5ab9666f84ef7b23bc95c5b38c33e43f98e03f3..34d9d30ce44317a7d7f839ba905222b29ba873c4 100644 (file)
--- a/man2/signalfd.2
+++ b/man2/signalfd.2
@@ -226,6 +226,15 @@ A
 .BR read (2)
 from the file descriptor in the child will return information
 about signals queued to the child.
+.SS Semantics of file descriptor passing
+As with other file descriptors,
+signalfd file descriptors can be passed to another process
+via a UNIX domain socket (see
+.BR unix (7)).
+In the receiving process, a
+.BR read (2)
+from the received file descriptor will return information
+about signals queued to that process.
 .SS execve(2) semantics
 Just like any other file descriptor,
 a signalfd file descriptor remains open across an