[LTP] [PATCH 2/2] tst_test.sh: Fix IPC init for checkpoints

[Cyril Hrubis]

The introduction of magic at the start of the LTP IPC region did break
the checkpoints for the tst_test.sh shell library. The reason is that
the library creates the IPC backing file with dd and the magic wasn't
present there.

This introduced failures in the pec testcases:

  cn_pec 1 TINFO: Test process events connector
  cn_pec 1 TINFO: Testing fork event (nevents=10)
  tst_test.c:203: TBROK: Invalid shared memory region (bad magic)
  cn_pec 1 TBROK: tst_checkpoint wait 10000 0 failed

This patch fixes the tst_test.sh library so that the IPC region is
created with a correct magic.

Follow-up: bf9589d5bd ("lib: moves test infrastructure states into a shared context structure")
Reported-by: Avinesh Kumar <akumar@suse.de>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 testcases/lib/tst_test.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/testcases/lib/tst_test.sh b/testcases/lib/tst_test.sh
index c32bd8b19..4be10a4f9 100644
--- a/testcases/lib/tst_test.sh
+++ b/testcases/lib/tst_test.sh
@@ -627,6 +627,7 @@ _tst_init_checkpoints()
 		tst_brk TBROK "tst_getconf PAGESIZE failed"
 	fi
 	ROD_SILENT dd if=/dev/zero of="$LTP_IPC_PATH" bs="$pagesize" count=1
+	ROD_SILENT "printf LTPM | dd of="$LTP_IPC_PATH" bs=1 seek=0 conv=notrunc"
 	ROD_SILENT chmod 600 "$LTP_IPC_PATH"
 	export LTP_IPC_PATH
 }
-- 
2.49.0