From 7cc754bc93eafa78695ec03bb0e4e8256d52c76d Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Sun, 28 Jan 2018 04:30:35 +0000 Subject: bits/mman.h: consolidate header file Sync with GNU C library and consolidate duplicate non architecture specific defines. MAP_UNINITIALIZED is only defined to 0x4000000 and used by the Linux kernel when CONFIG_MMAP_ALLOW_UNINITIALIZED is enabled. CONFIG_MMAP_ALLOW_UNINITIALIZED is only available for nommu. See Documentation/nommu-mmap.txt. --- libc/sysdeps/linux/common/bits/mman-shared.h | 75 ++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 libc/sysdeps/linux/common/bits/mman-shared.h (limited to 'libc/sysdeps/linux/common/bits/mman-shared.h') diff --git a/libc/sysdeps/linux/common/bits/mman-shared.h b/libc/sysdeps/linux/common/bits/mman-shared.h new file mode 100644 index 000000000..c40ae2d1e --- /dev/null +++ b/libc/sysdeps/linux/common/bits/mman-shared.h @@ -0,0 +1,75 @@ +/* Memory-mapping-related declarations/definitions, not architecture-specific. + Copyright (C) 2017-2018 Free Software Foundation, Inc. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _SYS_MMAN_H +# error "Never use directly; include instead." +#endif + +#ifdef __USE_GNU +/* Flags for memfd_create. */ +# ifndef MFD_CLOEXEC +# define MFD_CLOEXEC 1U +# define MFD_ALLOW_SEALING 2U +# define MFD_HUGETLB 4U +# endif + +/* Flags for mlock2. */ +# ifndef MLOCK_ONFAULT +# define MLOCK_ONFAULT 1U +# endif + +/* Access rights for pkey_alloc. */ +# ifndef PKEY_DISABLE_ACCESS +# define PKEY_DISABLE_ACCESS 0x1 +# define PKEY_DISABLE_WRITE 0x2 +# endif + +__BEGIN_DECLS + +/* Create a new memory file descriptor. NAME is a name for debugging. + FLAGS is a combination of the MFD_* constants. */ +int memfd_create (const char *__name, unsigned int __flags) __THROW; + +/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into + memory. FLAGS is a combination of the MLOCK_* flags above. */ +int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW; + +/* Allocate a new protection key, with the PKEY_DISABLE_* bits + specified in ACCESS_RIGHTS. The protection key mask for the + current thread is updated to match the access privilege for the new + key. */ +int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW; + +/* Update the access rights for the current thread for KEY, which must + have been allocated using pkey_alloc. */ +int pkey_set (int __key, unsigned int __access_rights) __THROW; + +/* Return the access rights for the current thread for KEY, which must + have been allocated using pkey_alloc. */ +int pkey_get (int _key) __THROW; + +/* Free an allocated protection key, which must have been allocated + using pkey_alloc. */ +int pkey_free (int __key) __THROW; + +/* Apply memory protection flags for KEY to the specified address + range. */ +int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW; + +__END_DECLS + +#endif /* __USE_GNU */ -- cgit v1.2.3