lsns: report with warnx if a namespace related ioctl fails with ENOSYS

Qemu userspace emulation reports ENOSYS if it doesn't support a given
ioctl command.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
(cherry picked from commit 0a7a8fbc7a82dfbd9e925d1b4d4936bf4e011bc1)

diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
index e68bdbed4687100fa99f5a7269714bfbf710109d..1f3574f99c9a737c1fcebc051064a8e157d80f56 100644 (file)
--- a/sys-utils/lsns.c
+++ b/sys-utils/lsns.c
@@ -68,7 +68,7 @@ UL_DEBUG_DEFINE_MASKNAMES(lsns) = UL_DEBUG_EMPTY_MASKNAMES;
 
 #define lsns_ioctl(fildes, request, ...) __extension__ ({ \
        int ret = ioctl(fildes, request, ##__VA_ARGS__); \
-       if (ret == -1 && errno == ENOTTY) \
+       if (ret == -1 && (errno == ENOTTY || errno == ENOSYS))  \
                warnx("Unsupported ioctl %s", #request); \
        ret; })