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

[Hangbin Liu <liuhangbin@gmail.com>]

On RHEL6.6, the kernel support setns syscall, but glibc(2.12) does not support
this syscall. Thus ltp build failed with "userns04.c:58: undefined reference
to `setns'". Use raw setns syscall to make ltp build pass.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 testcases/kernel/containers/userns/userns_helper.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/testcases/kernel/containers/userns/userns_helper.h b/testcases/kernel/containers/userns/userns_helper.h
index da03bae..9107886 100644
--- a/testcases/kernel/containers/userns/userns_helper.h
+++ b/testcases/kernel/containers/userns/userns_helper.h
@@ -15,6 +15,19 @@
 #include "test.h"
 #include "safe_macros.h"
 
+/*
+ * Use raw setns syscall for versions of glibc that don't include it (namely
+ * glibc-2.12)
+ */
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 14
+#ifdef SYS_setns
+int setns(int fd, int nstype)
+{
+	return syscall(SYS_setns, fd, nstype);
+}
+#endif
+#endif
+
 static int dummy_child(void *v)
 {
 	(void) v;
-- 
1.9.3


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