From 005d38f410e806a080b0dea79076651a31f914a2 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Thu, 28 Jan 2021 07:26:40 +0000
Subject: [PATCH] tests/leaks.sh: add procfs method for Linux

This allows faster testing for memory leaks on Linux if
ksh is compiled without vmalloc.
---
 src/cmd/ksh93/tests/leaks.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/cmd/ksh93/tests/leaks.sh b/src/cmd/ksh93/tests/leaks.sh
index 27628f9c2..a4886ed76 100755
--- a/src/cmd/ksh93/tests/leaks.sh
+++ b/src/cmd/ksh93/tests/leaks.sh
@@ -44,6 +44,15 @@ then	N=512			# number of iterations for each test
 	{
 		vmstate --format='%(busy_size)u'
 	}
+# On Linux, we can use /proc to get byte granularity for vsize (field 23).
+elif	[[ -f /proc/$$/stat && $(uname) == Linux ]]
+then	N=1024			# number of iterations for each test
+	unit=bytes
+	tolerance=$((4*N))	# tolerate 4 bytes per iteration to account for malloc artefacts
+	function getmem
+	{
+		cut -f 23 -d ' ' </proc/$$/stat
+	}
 # Otherwise, make do with the nonstandard 'rss' (real resident size) keyword
 # of the 'ps' command (the standard 'vsz', virtual size, is not usable).
 elif	n=$(ps -o rss= -p "$$" 2>/dev/null) &&