/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
#ifndef BASE_LINUX_MEMFD_DEFS_H
#define BASE_LINUX_MEMFD_DEFS_H
#include <sys/syscall.h>
// glibc before 2.27 didn't have a memfd_create wrapper, and if the
// build system is old enough then it won't have the syscall number
// and various related constants either.
#if defined(__x86_64__)
# define MEMFD_CREATE_NR 319
#elif defined(__i386__)
# define MEMFD_CREATE_NR 356
#elif defined(__aarch64__)
# define MEMFD_CREATE_NR 279
#elif defined(__arm__)
# define MEMFD_CREATE_NR 385
#elif defined(__powerpc__)
# define MEMFD_CREATE_NR 360
#elif defined(__s390__)
# define MEMFD_CREATE_NR 350
#elif defined(__mips__)
# include <sgidefs.h>
# if _MIPS_SIM == _MIPS_SIM_ABI32
# define MEMFD_CREATE_NR 4354
# elif _MIPS_SIM == _MIPS_SIM_ABI64
# define MEMFD_CREATE_NR 5314
# elif _MIPS_SIM == _MIPS_SIM_NABI32
# define MEMFD_CREATE_NR 6318
# endif
// mips subarch
#endif // arch
#ifdef MEMFD_CREATE_NR
# ifdef SYS_memfd_create
static_assert(MEMFD_CREATE_NR == SYS_memfd_create,
"MEMFD_CREATE_NR should match the actual SYS_memfd_create value");
# else // defined here but not in system headers
# define SYS_memfd_create MEMFD_CREATE_NR
# endif
#endif
#ifndef MFD_CLOEXEC
# define MFD_CLOEXEC 0x0001U
# define MFD_ALLOW_SEALING 0x0002U
#endif
#ifndef MFD_NOEXEC_SEAL
# define MFD_NOEXEC_SEAL 0x0008U
#endif
#ifndef F_ADD_SEALS
# ifndef F_LINUX_SPECIFIC_BASE
# define F_LINUX_SPECIFIC_BASE 1024
# endif
# define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
# define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
# define F_SEAL_SEAL 0x0001
/* prevent further seals from being set */
# define F_SEAL_SHRINK 0x0002
/* prevent file from shrinking */
# define F_SEAL_GROW 0x0004
/* prevent file from growing */
# define F_SEAL_WRITE 0x0008
/* prevent writes */
#endif
#ifndef F_SEAL_FUTURE_WRITE
# define F_SEAL_FUTURE_WRITE 0x0010
#endif
#endif // BASE_LINUX_MEMFD_DEFS_H
