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samples: make pidfd-metadata fail gracefully on older kernels
authorDmitry V. Levin <ldv@altlinux.org>
Sun, 23 Jun 2019 11:28:00 +0000 (14:28 +0300)
committerChristian Brauner <christian@brauner.io>
Mon, 24 Jun 2019 13:55:50 +0000 (15:55 +0200)
commitbee19cd8f241ab3cd1bf79e03884e5371f9ef514
tree49430f9d17dcbc8c1d47b1cd5b15426a5ec6ba0d
parent9014143bab2f3bc0b9e5db3bc8d00e2a43e50fbd
samples: make pidfd-metadata fail gracefully on older kernels

Initialize pidfd to an invalid descriptor, to fail gracefully on
those kernels that do not implement CLONE_PIDFD and leave pidfd
unchanged.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Christian Brauner <christian@brauner.io>
samples/pidfd/pidfd-metadata.c