Older versions of glibc don't provide the setns() syscall
function wrapper, so we must define it ourselves to prevent
build failure on old distros.
Signed-off-by: Daniel P. Berrange berra...@redhat.com
Pushed as a RHEL-6 build-break fix
---
src/lxc/lxc_container.c | 34 ++
1 file changed, 34 insertions(+)
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 8011ed0..feb8fad 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -95,6 +95,40 @@ VIR_LOG_INIT(lxc.lxc_container);
# define CLONE_NEWNET 0x4000 /* New network namespace */
#endif
+/*
+ * Workaround older glibc. While kernel may support the setns
+ * syscall, the glibc wrapper might not exist. If that's the
+ * case, use our own.
+ */
+#ifndef __NR_setns
+# if defined(__x86_64__)
+# define __NR_setns 308
+# elif defined(__i386__)
+# define __NR_setns 346
+# elif defined(__arm__)
+# define __NR_setns 375
+# elif defined(__aarch64__)
+# define __NR_setns 375
+# elif defined(__powerpc__)
+# define __NR_setns 350
+# elif defined(__s390__)
+# define __NR_setns 339
+# endif
+#endif
+
+#ifndef HAVE_SETNS
+# if defined(__NR_setns)
+# include sys/syscall.h
+
+static inline int setns(int fd, int nstype)
+{
+return syscall(__NR_setns, fd, nstype);
+}
+# else /* !__NR_setns */
+# error Please determine the syscall number for setns on your architecture
+# endif
+#endif
+
/* messages between parent and container */
typedef char lxc_message_t;
#define LXC_CONTINUE_MSG 'c'
--
2.4.3
--
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