From 869a4e68a4c3490fea5dcc77381c05fb2defa0b2 Mon Sep 17 00:00:00 2001
From: Andrew Wood <ivarch657@gmail.com>
Date: Sat, 30 Nov 2024 23:39:32 +0000
Subject: [PATCH] Memory safety check for --watchfd.

---
 tests/Memory_safety_-_Watchfd.test | 55 ++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100755 tests/Memory_safety_-_Watchfd.test

diff --git a/tests/Memory_safety_-_Watchfd.test b/tests/Memory_safety_-_Watchfd.test
new file mode 100755
index 0000000..bb52bde
--- /dev/null
+++ b/tests/Memory_safety_-_Watchfd.test
@@ -0,0 +1,55 @@
+#!/bin/sh
+#
+# Run valgrind's memory checker against a process using the --watchfd
+# option.
+
+# Dummy assignments for "shellcheck".
+sourcePath="${sourcePath:-.}"; testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"; workFile2="${workFile2:-.tmp2}"; workFile3="${workFile3:-.tmp3}"; workFile4="${workFile4:-.tmp4}"
+
+# Load the valgrind function.
+. "${sourcePath}/tests/run-valgrind.sh"
+
+# Skip the test if "-d" is not available.
+if ! "${testSubject}" -h | grep -Fq ' -d'; then
+	echo "no \`--watchfd' / \`-d' option on this platform"
+	exit 77
+fi
+
+# Skip the test if "-d" does not work.
+sleep 2 &
+sleep 0.1
+"${testSubject}" -d "${pid}" -f -i 0.5 >/dev/null 2>"${workFile1}"
+if grep -Fq ' -d: not available' "${workFile1}"; then
+	echo "no \`--watchfd' / \`-d' option on this platform"
+	exit 77
+fi
+
+# Check "--watchfd PID:FD".
+# See the "Watchfd" tests for more detail.
+seq 1 100 > "${workFile1}"
+(export line; sleep 1; read -r line; sleep 1; read -r line; sleep 1) <"${workFile1}" &
+pid=$!
+sleep 0.1
+{ runWithValgrind -d "${pid}:0" -f -i 0.5 >/dev/null 2>&1; } 4>&1 || exit 1
+
+# Check "--watchfd PID".
+seq 1 100 > "${workFile1}"
+seq 1 300 > "${workFile2}"
+(
+export line
+sleep 1
+read -r line
+exec 9<"${workFile2}"
+sleep 1
+exec 8<"${workFile1}"
+exec 7</dev/null
+sleep 1
+exec 9<&-
+read -r line
+sleep 1
+) <"${workFile1}" &
+pid=$!
+sleep 0.1
+{ runWithValgrind -d "${pid}" -f -i 0.5 >/dev/null 2>&1; } 4>&1 || exit 1
+
+exit 0