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-rw-r--r--share/man/man4/ddb.415
1 files changed, 14 insertions, 1 deletions
diff --git a/share/man/man4/ddb.4 b/share/man/man4/ddb.4
index 1fe3490edd36..4f1614d8e006 100644
--- a/share/man/man4/ddb.4
+++ b/share/man/man4/ddb.4
@@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd January 26, 2021
+.Dd March 14, 2021
.Dt DDB 4
.Os
.Sh NAME
@@ -1571,6 +1571,19 @@ The debugger may be entered by setting the
.Xr sysctl 8
.Va debug.kdb.enter
to 1.
+.Pp
+Output may be interrupted, paused, and resumed with the control
+characters CTRL-C, CTRL-S, and CTRL-Q.
+Because these control characters are received as in-band data from the
+console, there is an input buffer, and once that buffer fills
+.Nm
+must either stop responding to control characters or drop additional
+input while continuing to search for control characters.
+This behavior is controlled by the tunable
+.Xr sysctl 8
+.Va debug.ddb.prioritize_control_input ,
+which defaults to 1.
+The input buffer size is 512 bytes.
.Sh FILES
Header files mentioned in this manual page can be found below
.Pa /usr/include