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99b66f5315
shm_open2 allows a little more flexibility than the original shm_open. shm_open2 doesn't enforce CLOEXEC on its callers, and it has a separate shmflag argument that can be expanded later. Currently the only shmflag is to allow file sealing on the returned fd. shm_open and memfd_create will both be implemented in libc to use this new syscall. __FreeBSD_version is bumped to indicate the presence. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D21393