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D25488.id73771.diff
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Index: share/man/man4/termios.4
===================================================================
--- share/man/man4/termios.4
+++ share/man/man4/termios.4
@@ -28,7 +28,7 @@
.\" @(#)termios.4 8.4 (Berkeley) 4/19/94
.\" $FreeBSD$
.\"
-.Dd December 26, 2009
+.Dd June 27, 2020
.Dt TERMIOS 4
.Os
.Sh NAME
@@ -761,6 +761,13 @@
wait channel, the number of user and system seconds used,
the percentage of cpu the process is getting, and the resident
set size of the process.
+.Pp
+In case the
+.Xr sysctl 8
+variable
+.Va kern.tty_info_kstacks
+is set to a non-zero value, the running thread's stack is
+written to the terminal for debugging purposes.
.El
.Pp
The
@@ -1586,4 +1593,5 @@
.Xr tcsendbreak 3 ,
.Xr tcsetattr 3 ,
.Xr tcsetsid 3 ,
-.Xr tty 4
+.Xr tty 4 ,
+.Xr stack 9
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