seccomp / libseccomp / 190

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Pull #147

travis-ci

api: implement user notification in libseccomp

Kernel 5.0 includes the new user notification return code. Here's all the
infrastructure to handle that.

The idea behind the user notification return code is that the filter stops
the syscall, and forwards it to a "listener fd" that is created when
installing a filter. Then then some userspace task can listen and process
events accordingly by taking some (or no) action in userspace, and then
returning a value from the command.

Signed-off-by: Tycho Andersen <tycho@tycho.ws>

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