Improve test a bit, now that we have fstat(2) support.

The test was support to check if SUID/SGID bits are removed on first
write, but actually we were checking if they were removed after close.
Now we can check if SUID/SGID bits are gone after first write.

While here add checks to see if when both SUID and SGID bits are set they are
both cleared on first write.

1 files changed, 9 insertions, 3 deletions

diff --git a/tools/regression/pjdfstest/tests/chmod/12.t b/tools/regression/pjdfstest/tests/chmod/12.t
index 4b5c58c..affa8de 100644
--- a/tools/regression/pjdfstest/tests/chmod/12.t
+++ b/tools/regression/pjdfstest/tests/chmod/12.t
@@ -6,7 +6,7 @@ desc="verify SUID/SGID bit behaviour"
 dir=`dirname $0`
 . ${dir}/../misc.sh
 
-echo "1..10"
+echo "1..14"
 
 n0=`namegen`
 n1=`namegen`
@@ -18,13 +18,19 @@ cd ${n2}
 
 # Check whether writing to the file by non-owner clears the SUID.
 expect 0 create ${n0} 04777
-expect 0 -u 65534 -g 65534 open ${n0} O_WRONLY : write 0 x
+expect 0777 -u 65534 -g 65534 open ${n0} O_WRONLY : write 0 x : fstat 0 mode
 expect 0777 stat ${n0} mode
 expect 0 unlink ${n0}
 
 # Check whether writing to the file by non-owner clears the SGID.
 expect 0 create ${n0} 02777
-expect 0 -u 65534 -g 65534 open ${n0} O_RDWR : write 0 x
+expect 0777 -u 65534 -g 65534 open ${n0} O_RDWR : write 0 x : fstat 0 mode
+expect 0777 stat ${n0} mode
+expect 0 unlink ${n0}
+
+# Check whether writing to the file by non-owner clears the SUID+SGID.
+expect 0 create ${n0} 06777
+expect 0777 -u 65534 -g 65534 open ${n0} O_RDWR : write 0 x : fstat 0 mode
 expect 0777 stat ${n0} mode
 expect 0 unlink ${n0}