From: Karel Zak <kzak@redhat.com>
Date: Tue, 19 Jan 2021 15:25:33 +0000 (+0100)
Subject: tests: improve u64 use in ipcs test
X-Git-Tag: v2.37-rc1~173
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=734678205af89c2022fd1ad86fddd7c07d188f20;p=thirdparty%2Futil-linux.git

tests: improve u64 use in ipcs test

UINT64_MAX is 18446744073709551615, but 2^64 is 18446744073709551616.
We also need to use kbytes in all calculation in the test than bytes
as ipcs by default do not use bytes anymore.

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/tests/helpers/test_sysinfo.c b/tests/helpers/test_sysinfo.c
index ce7bc081a5..e13931d04b 100644
--- a/tests/helpers/test_sysinfo.c
+++ b/tests/helpers/test_sysinfo.c
@@ -19,6 +19,8 @@
 #include <string.h>
 #include <unistd.h>
 #include <limits.h>
+#include <stdint.h>
+#include <inttypes.h>
 
 typedef struct {
 	const char	*name;
@@ -72,6 +74,12 @@ static int hlp_ulong_max(void)
 	return 0;
 }
 
+static int hlp_u64_max(void)
+{
+	printf("%" PRIu64 "\n", UINT64_MAX);
+	return 0;
+}
+
 static int hlp_ulong_max32(void)
 {
 #if __WORDSIZE == 64
@@ -91,6 +99,7 @@ static mntHlpfnc hlps[] =
 	{ "LONG_MAX",   hlp_long_max	},
 	{ "ULONG_MAX",  hlp_ulong_max	},
 	{ "ULONG_MAX32",hlp_ulong_max32	},
+	{ "UINT64_MAX", hlp_u64_max     },
 	{ "byte-order", hlp_endianness  },
 	{ NULL, NULL }
 };
diff --git a/tests/ts/ipcs/functions.sh b/tests/ts/ipcs/functions.sh
index b23e123d9c..e9b437ee4d 100644
--- a/tests/ts/ipcs/functions.sh
+++ b/tests/ts/ipcs/functions.sh
@@ -63,6 +63,8 @@ IPCS_LIMITS=(
 # list of indexes = 0..(sizeof Array - 1)
 IPCS_IDX=$(seq 0 $(( ${#IPCS_PROCFILES[*]} - 1 )))
 
+UINT64_MAX=$($TS_HELPER_SYSINFO UINT64_MAX)
+
 # checker
 function ipcs_limits_check {
 	for i in $IPCS_IDX; do
@@ -72,16 +74,17 @@ function ipcs_limits_check {
 		a=$(eval ${IPCS_KERNEL_CMD[$i]})
 		b=$(eval ${IPCS_CMD[$i]})
 
+		# follow the way how ipcs handles u64 overflow
+		max_kbytes=$(bc <<< "$UINT64_MAX - ($UINT64_MAX % ($PAGE_SIZE / 1024))")
+
 		#echo
-		#echo "KERNEL-CMD: ${IPCS_KERNEL_CMD[$i]}"
-		#echo "KERNEL-RAW: $(cat ${IPCS_PROCFILES[$i]})"
-		#echo "IPCS-CMD:   ${IPCS_CMD[$i]}"
+		#echo "kernel kbytes: $a"
+		#echo "lsipc kbytes:  $b"
+		#echo "max kbytes:    $max_kbytes"
 		#echo
 
-		# overflow is handled differently because we don't have large
-		# int math, see https://github.com/karelzak/util-linux/issues/51
-		if [ $(bc <<<"$a >= 2^64/1024") -eq 1 ]; then
-			a=$(bc <<<"(2^64 - $PAGE_SIZE)/1024")
+		if [ $(bc <<<"$a > $max_kbytes") -eq 1 ]; then
+			a=$max_kbytes
 		fi
 
 		if [ x"$a" == x"$b" ]; then