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From: Mao Chuan Li <maochuan@linux.vnet.ibm.com>
Date: Thu, 13 Nov 2014 18:36:55 +0800
Message-Id: <1415875021-15248-4-git-send-email-maochuan@linux.vnet.ibm.com>
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Subject: [Qemu-devel] [PATCH v1 RFC 3/9] qemu-iotests: add core_pattern
	access functions
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To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Michael Mueller <mimu@linux.vnet.ibm.com>, Mao Chuan Li <maochuan@linux.vnet.ibm.com>, Alexander Graf <agraf@suse.de>, Christian Borntraeger <borntraeger@de.ibm.com>, Stefan Hajnoczi <stefanha@redhat.com>, Cornelia Huck <cornelia.huck@de.ibm.com>

To prevent core dump file generation, the new functions allow to clear
and restore the /proc/sys/kernel/core_pattern definition.

Reviewed-by:   Michael Mueller <mimu@linux.vnet.ibm.com>
Signed-off-by: Mao Chuan Li <maochuan@linux.vnet.ibm.com>
---
 tests/qemu-iotests/common.rc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 9c49deb..87edf36 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -478,5 +478,22 @@ _die()
         exit 1
 }
 
+core_pattern_file="/proc/sys/kernel/core_pattern"
+
+_erase_core_pattern()
+{
+    saved_pattern=$(cat $core_pattern_file)
+
+    echo  > "$core_pattern_file"
+    if [ $? != 0 ]; then
+        exit 1
+    fi
+}
+
+_restore_core_pattern()
+{
+    echo $saved_pattern > $core_pattern_file
+}
+
 # make sure this script returns success
 /bin/true
-- 
1.9.3