[LTP] [PATCH v2] ioctl: check if tty device nodes are usable

[Jan S. <jst...@re...>]

ioctl testcases fail on s390x because it doesn't
support virtual consoles.

Trying to use such device node fails:
ioctl01_02    0  TINFO  :  Testing ioctl01 with /dev/tty0
ioctl01     1  TBROK  :  Couldn't open /dev/tty0: errno=ENXIO(6): No
such device or address

This patch tries to get terminal line settings for each tty,
that would be used in test. If that fails, tty is skipped.

Signed-off-by: Jan Stancek <jst...@re...>
---
 testcases/kernel/syscalls/ioctl/test_ioctl |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/testcases/kernel/syscalls/ioctl/test_ioctl b/testcases/kernel/syscalls/ioctl/test_ioctl
index e824ff7..2e5ef25 100755
--- a/testcases/kernel/syscalls/ioctl/test_ioctl
+++ b/testcases/kernel/syscalls/ioctl/test_ioctl
@@ -23,11 +23,27 @@ export TCID=ioctl01_02
 export TST_TOTAL=2
 export TST_COUNT=0
 
+has_tty()
+{
+    if command -v stty >/dev/null 2>&1; then
+        stty --file=$1 > /dev/null
+        if [ $? -ne 0 ]; then
+            return 0
+        fi
+    fi
+    return 1
+}
+
 for tttype in `ls /dev/tty*`
 do
 device_no=${tttype#/dev/tty}
 case "$device_no" in
 [0-9]|[0-9][0-9])
+    has_tty $tttype
+    if [ $? -eq 0 ]; then
+        tst_resm TINFO "Skipping ioctl01 with $tttype"
+        continue
+    fi
     tst_resm TINFO "Testing ioctl01 with $tttype"
     ioctl01 -D $tttype
     RC=$?
@@ -46,6 +62,11 @@ do
 device_no=${tttype#/dev/tty}
 case "$device_no" in
 [0-9]|[0-9][0-9])
+    has_tty $tttype
+    if [ $? -eq 0 ]; then
+        tst_resm TINFO "Skipping ioctl02 with $tttype"
+        continue
+    fi
     tst_resm TINFO "Testing ioctl02 with $tttype"
     ioctl02 -D $tttype
     RC=$?
-- 
1.7.1