From fa3a3d7955074eb15ecb726f3cfcc9b61e499e9b Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Tue, 2 Feb 2021 04:25:46 +0000
Subject: [PATCH] sh_ntfork(): handle SIGTSTP along with SIGTTIN and SIGTTOU

This applies a patch from OpenSUSE that makes SIGTSTP handling
consistent with that of SIGTTIN and SIGTTOU.
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-signals.dif
---
 src/cmd/ksh93/sh/xec.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/cmd/ksh93/sh/xec.c b/src/cmd/ksh93/sh/xec.c
index d594fd59c2ba..8735a6b2c066 100644
--- a/src/cmd/ksh93/sh/xec.c
+++ b/src/cmd/ksh93/sh/xec.c
@@ -3573,6 +3573,7 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
 				{
 					signal(SIGTTIN,SIG_DFL);
 					signal(SIGTTOU,SIG_DFL);
+					signal(SIGTSTP,SIG_DFL);
 				}
 #endif /* SIGTSTP */
 #ifdef JOBS
@@ -3610,6 +3611,10 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
 			{
 				signal(SIGTTIN,SIG_IGN);
 				signal(SIGTTOU,SIG_IGN);
+				if(sh_isstate(SH_INTERACTIVE))
+					signal(SIGTSTP,SIG_IGN);
+				else
+					signal(SIGTSTP,SIG_DFL);
 			}
 #endif /* SIGTSTP */
 			if(spawnpid>0)
@@ -3695,6 +3700,7 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
 		{
 			signal(SIGTTIN,SIG_DFL);
 			signal(SIGTTOU,SIG_DFL);
+			signal(SIGTSTP,SIG_DFL);
 			jobwasset++;
 		}
 #endif /* SIGTSTP */
@@ -3758,6 +3764,10 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
 	{
 		signal(SIGTTIN,SIG_IGN);
 		signal(SIGTTOU,SIG_IGN);
+		if(sh_isstate(SH_INTERACTIVE))
+			signal(SIGTSTP,SIG_IGN);
+		else
+			signal(SIGTSTP,SIG_DFL);
 	}
 #endif /* SIGTSTP */
 	if(sigwasset)