Index: share/man/man4/linux.4
===================================================================
--- share/man/man4/linux.4
+++ share/man/man4/linux.4
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 13, 2019
+.Dd December 15, 2019
 .Dt LINUX 4
 .Os
 .Sh NAME
@@ -105,6 +105,14 @@
 on the value of this sysctl.
 .It Va compat.linux.oss_version
 Linux Open Sound System version.
+.It Va compat.linux.preserve_vstatus
+When set to 1, it prevents Linux applications from resetting the
+.Xr termios 4
+VSTATUS setting.
+From a user perspective, this makes
+.Va SIGINFO
+work for Linux executables.
+Defaults to 0.
 .Sh FILES
 .Bl -tag -width /compat/linux/dev/shm -compact
 .It Pa /compat/linux
Index: sys/compat/linux/linux_ioctl.h
===================================================================
--- sys/compat/linux/linux_ioctl.h
+++ sys/compat/linux/linux_ioctl.h
@@ -435,6 +435,7 @@
 #define	LINUX_VWERASE		14
 #define	LINUX_VLNEXT		15
 #define	LINUX_VEOL2		16
+#define	LINUX_VSTATUS		18
 #define	LINUX_NCCS		19
 
 #define	LINUX_POSIX_VDISABLE	'\0'
Index: sys/compat/linux/linux_ioctl.c
===================================================================
--- sys/compat/linux/linux_ioctl.c
+++ sys/compat/linux/linux_ioctl.c
@@ -500,6 +500,8 @@
 	lios->c_cc[LINUX_VDISCARD] = bios->c_cc[VDISCARD];
 	lios->c_cc[LINUX_VWERASE] = bios->c_cc[VWERASE];
 	lios->c_cc[LINUX_VLNEXT] = bios->c_cc[VLNEXT];
+	if (linux_preserve_vstatus)
+		lios->c_cc[LINUX_VSTATUS] = bios->c_cc[VSTATUS];
 
 	for (i=0; i<LINUX_NCCS; i++) {
 		if (i != LINUX_VMIN && i != LINUX_VTIME &&
@@ -614,6 +616,8 @@
 	bios->c_cc[VDISCARD] = lios->c_cc[LINUX_VDISCARD];
 	bios->c_cc[VWERASE] = lios->c_cc[LINUX_VWERASE];
 	bios->c_cc[VLNEXT] = lios->c_cc[LINUX_VLNEXT];
+	if (linux_preserve_vstatus)
+		bios->c_cc[VSTATUS] = lios->c_cc[LINUX_VSTATUS];
 
 	for (i=0; i<NCCS; i++) {
 		if (i != VMIN && i != VTIME &&
Index: sys/compat/linux/linux_mib.h
===================================================================
--- sys/compat/linux/linux_mib.h
+++ sys/compat/linux/linux_mib.h
@@ -62,4 +62,6 @@
 
 #define	linux_use26(t)		(linux_kernver(t) >= LINUX_KERNVER_2006000)
 
+extern int linux_preserve_vstatus;
+
 #endif /* _LINUX_MIB_H_ */
Index: sys/compat/linux/linux_mib.c
===================================================================
--- sys/compat/linux/linux_mib.c
+++ sys/compat/linux/linux_mib.c
@@ -62,6 +62,10 @@
 
 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode");
 
+int linux_preserve_vstatus = 0;
+SYSCTL_INT(_compat_linux, OID_AUTO, preserve_vstatus, CTLFLAG_RWTUN,
+    &linux_preserve_vstatus, 0, "Preserve VSTATUS termios(4) flag");
+
 static int	linux_set_osname(struct thread *td, char *osname);
 static int	linux_set_osrelease(struct thread *td, char *osrelease);
 static int	linux_set_oss_version(struct thread *td, int oss_version);