From dd5455ac5f76474d4fca8ab042f5d1a4d7e63950 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Mon, 3 May 2021 16:36:39 +0100
Subject: [PATCH] tests/io.sh: fix spurious failure on Gentoo i386 (re:
 c4f980eb)

---
 src/cmd/ksh93/tests/io.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/cmd/ksh93/tests/io.sh b/src/cmd/ksh93/tests/io.sh
index 77d1171ab..275214591 100755
--- a/src/cmd/ksh93/tests/io.sh
+++ b/src/cmd/ksh93/tests/io.sh
@@ -824,9 +824,9 @@ got=$(umask 777; set +x; { cat <(echo ok); } 2>&1)
 # ======
 # https://github.com/att/ast/issues/1336
 # Use the /proc pseudo filesystem on Linux as a convenient way to force a write I/O error.
-if [[ $(uname) == Linux ]]
+if [[ -e /proc/self/mem && $(uname) == Linux ]]
 then
-	actual=$($SHELL -c 'echo > /proc/self/uid_map; echo okay' 2>&1)
+	actual=$(LC_ALL=C "$SHELL" -c 'echo > /proc/self/mem; echo okay' 2>&1)
 	expect='write.*failed.*okay'
 	[[ "$actual" =~ $expect ]] || err_exit "I/O failure not handled" \
 		"(expected $(printf %q "$expect"), got $(printf %q "$actual"))"