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diff --git a/bin/stty/stty.1 b/bin/stty/stty.1
--- a/bin/stty/stty.1
+++ b/bin/stty/stty.1
@@ -32,7 +32,7 @@
.\" @(#)stty.1 8.4 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
-.Dd May 24, 2022
+.Dd September 27, 2022
.Dt STTY 1
.Os
.Sh NAME
@@ -40,7 +40,7 @@
.Nd set the options for a terminal device interface
.Sh SYNOPSIS
.Nm
-.Op Fl a | e | g
+.Op Fl a | e | g | i
.Op Fl f Ar file
.Op Ar arguments
.Sh DESCRIPTION
@@ -85,6 +85,23 @@
.Nm
to restore the current terminal state as per
.St -p1003.2 .
+.It Fl i
+Allow
+.Nm
+to change terminal settings even when executing in background
+process group (see description of the job control in
+.Xr termios 4 ) .
+Normally, such attempt results in kernel sending the
+.Va SIGTTOU
+signal and stopping of the process until its group is returned
+to foreground.
+Using this option makes
+.Nm
+ignore
+.Va SIGTTOU .
+.Pp
+Note that changing terminal settings for running foreground
+job that is not prepared to it might cause inconsistencies.
.El
.Pp
The following arguments are available to set the terminal
diff --git a/bin/stty/stty.c b/bin/stty/stty.c
--- a/bin/stty/stty.c
+++ b/bin/stty/stty.c
@@ -47,6 +47,7 @@
#include <err.h>
#include <fcntl.h>
#include <limits.h>
+#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -59,6 +60,7 @@
main(int argc, char *argv[])
{
struct info i;
+ struct sigaction sa;
enum FMT fmt;
int ch;
const char *file, *errstr = NULL;
@@ -69,8 +71,8 @@
opterr = 0;
while (optind < argc &&
- strspn(argv[optind], "-aefg") == strlen(argv[optind]) &&
- (ch = getopt(argc, argv, "aef:g")) != -1)
+ strspn(argv[optind], "-aefgi") == strlen(argv[optind]) &&
+ (ch = getopt(argc, argv, "aef:gi")) != -1)
switch(ch) {
case 'a': /* undocumented: POSIX compatibility */
fmt = POSIX;
@@ -86,6 +88,12 @@
case 'g':
fmt = GFLAG;
break;
+ case 'i':
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = SIG_IGN;
+ if (sigaction(SIGTTOU, &sa, NULL) == -1)
+ err(1, "sigaction");
+ break;
case '?':
default:
goto args;
@@ -161,6 +169,6 @@
{
(void)fprintf(stderr,
- "usage: stty [-a | -e | -g] [-f file] [arguments]\n");
+ "usage: stty [-a | -e | -g] [-i] [-f file] [arguments]\n");
exit (1);
}

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