Export cin, cout, sin and sout vars into mptcp_lib.sh as public vars.
Then they can be used in all test script unified.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 tools/testing/selftests/net/mptcp/mptcp_connect.sh | 8 --------
 tools/testing/selftests/net/mptcp/mptcp_join.sh    | 8 --------
 tools/testing/selftests/net/mptcp/mptcp_lib.sh     | 5 +++++
 tools/testing/selftests/net/mptcp/mptcp_sockopt.sh | 8 --------
 tools/testing/selftests/net/mptcp/simult_flows.sh  | 2 --
 5 files changed, 5 insertions(+), 26 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index 91f0fb386bdd..da932176c85d 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -8,11 +8,7 @@ time_start=$(date +%s)
 optstring="S:R:d:e:l:r:h4cm:f:tC"
 ret=0
 final_ret=0
-sin=""
-sout=""
 cin_disconnect=""
-cin=""
-cout=""
 ksft_skip=4
 capture=false
 timeout_poll=30
@@ -149,10 +145,6 @@ if [ $? -ne 0 ];then
 	exit $ksft_skip
 fi
 
-sin=$(mktemp)
-sout=$(mktemp)
-cin=$(mktemp)
-cout=$(mktemp)
 capout=$(mktemp)
 cin_disconnect="$cin".disconnect
 cout_disconnect="$cout".disconnect
diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index e468be7becb4..4aac1bce8aec 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -13,14 +13,10 @@
 . "$(dirname "${0}")/mptcp_lib.sh"
 
 ret=0
-sin=""
 sinfail=""
-sout=""
-cin=""
 cinfail=""
 cinsent=""
 tmpfile=""
-cout=""
 capout=""
 ksft_skip=4
 iptables="iptables"
@@ -166,11 +162,7 @@ init() {
 
 	check_tools
 
-	sin=$(mktemp)
-	sout=$(mktemp)
-	cin=$(mktemp)
 	cinsent=$(mktemp)
-	cout=$(mktemp)
 	mptcp_lib_evts_init
 
 	trap cleanup EXIT
diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index e200eaa2047c..53e69fc807a6 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -17,6 +17,11 @@ readonly AF_INET6=10
 
 MPTCP_LIB_SUBTESTS=()
 
+sin=$(mktemp)
+sout=$(mktemp)
+cin=$(mktemp)
+cout=$(mktemp)
+
 # only if supported (or forced) and not disabled, see no-color.org
 if { [ -t 1 ] || [ "${SELFTESTS_MPTCP_LIB_COLOR_FORCE:-}" = "1" ]; } &&
    [ "${NO_COLOR:-}" != "1" ]; then
diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
index ac907bd302a6..780ceb9314b9 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
@@ -4,10 +4,6 @@
 . "$(dirname "${0}")/mptcp_lib.sh"
 
 ret=0
-sin=""
-sout=""
-cin=""
-cout=""
 ksft_skip=4
 timeout_poll=30
 timeout_test=$((timeout_poll * 2 + 1))
@@ -336,10 +332,6 @@ do_tcpinq_tests()
 	return $?
 }
 
-sin=$(mktemp)
-sout=$(mktemp)
-cin=$(mktemp)
-cout=$(mktemp)
 init
 make_file "$cin" "client" 1
 make_file "$sin" "server" 1
diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index 92b08750a16a..0a06b7f41650 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -50,8 +50,6 @@ setup()
 {
 	large=$(mktemp)
 	small=$(mktemp)
-	sout=$(mktemp)
-	cout=$(mktemp)
 	capout=$(mktemp)
 	size=$((2 * 2048 * 4096))
 
-- 
2.35.3