linux_memfd_defs.h

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/* -*- 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 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