9bdfa4d23f
Add support for the memfd_create syscall. If the host does not have the libc wrapper, translate to a direct syscall with NC-macro. Buglink: https://bugs.launchpad.net/qemu/+bug/1734792 Signed-off-by: Shu-Chun Weng <scw@google.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20190819180947.180725-1-scw@google.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#ifndef QEMU_MEMFD_H
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#define QEMU_MEMFD_H
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#ifndef F_LINUX_SPECIFIC_BASE
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#define F_LINUX_SPECIFIC_BASE 1024
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#endif
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#ifndef F_ADD_SEALS
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#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
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#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
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#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
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#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
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#define F_SEAL_GROW 0x0004 /* prevent file from growing */
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#define F_SEAL_WRITE 0x0008 /* prevent writes */
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#endif
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#ifndef MFD_CLOEXEC
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#define MFD_CLOEXEC 0x0001U
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#endif
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#ifndef MFD_ALLOW_SEALING
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#define MFD_ALLOW_SEALING 0x0002U
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#endif
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#ifndef MFD_HUGETLB
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#define MFD_HUGETLB 0x0004U
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#endif
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#ifndef MFD_HUGE_SHIFT
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#define MFD_HUGE_SHIFT 26
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#endif
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#if defined CONFIG_LINUX && !defined CONFIG_MEMFD
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int memfd_create(const char *name, unsigned int flags);
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#endif
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int qemu_memfd_create(const char *name, size_t size, bool hugetlb,
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uint64_t hugetlbsize, unsigned int seals, Error **errp);
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bool qemu_memfd_alloc_check(void);
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void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
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int *fd, Error **errp);
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void qemu_memfd_free(void *ptr, size_t size, int fd);
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bool qemu_memfd_check(unsigned int flags);
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#endif /* QEMU_MEMFD_H */
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