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/usr/include/linux/memfd.h is in linux-libc-dev 4.9.144-3.

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#ifndef _LINUX_MEMFD_H
#define _LINUX_MEMFD_H

/* flags for memfd_create(2) (unsigned int) */
#define MFD_CLOEXEC		0x0001U
#define MFD_ALLOW_SEALING	0x0002U

#endif /* _LINUX_MEMFD_H */