[LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[Hangbin Liu <liuhangbin@gmail.com>]

The setns() system call was added to glibc in version 2.14. On systems with
lower version glic, like RHEL6.6 glibc 2.12, ltp will build failed with
error "userns04.c:58: undefined reference to `setns'". Use ltp_syscall to make
build pass.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 testcases/kernel/containers/userns/userns_helper.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/testcases/kernel/containers/userns/userns_helper.h b/testcases/kernel/containers/userns/userns_helper.h
index da03bae..21e5cb8 100644
--- a/testcases/kernel/containers/userns/userns_helper.h
+++ b/testcases/kernel/containers/userns/userns_helper.h
@@ -15,6 +15,16 @@
 #include "test.h"
 #include "safe_macros.h"
 
+/*
+ * Use raw setns syscall for versions of glibc that don't include it
+ */
+#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14
+int setns(int fd, int nstype)
+{
+	return ltp_syscall(__NR_setns, fd, nstype);
+}
+#endif
+
 static int dummy_child(void *v)
 {
 	(void) v;
-- 
1.9.3


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