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Diffstat (limited to 'sysdeps/generic/sys/mman.h')
| -rw-r--r-- | sysdeps/generic/sys/mman.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/generic/sys/mman.h b/sysdeps/generic/sys/mman.h new file mode 100644 index 0000000000..3575eeb3b4 --- /dev/null +++ b/sysdeps/generic/sys/mman.h @@ -0,0 +1,106 @@ +/* Definitions for BSD-style memory management. Generic/4.4 BSD version. +Copyright (C) 1994 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* These are the bits used by 4.4 BSD and its derivatives. On systems + (such as GNU) where these facilities are not system services but can be + emulated in the C library, these are the definitions we emulate. */ + +#ifndef _SYS_MMAN_H + +#define _SYS_MMAN_H 1 +#include <features.h> + +#include <gnu/types.h> +#define __need_size_t +#include <stddef.h> + + +/* Protections are chosen from these bits, OR'd together. The + implementation does not necessarily support PROT_EXEC or PROT_WRITE + without PROT_READ. The only guarantees are that no writing will be + allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ + +#define PROT_NONE 0x00 /* No access. */ +#define PROT_READ 0x04 /* Pages can be read. */ +#define PROT_WRITE 0x02 /* Pages can be written. */ +#define PROT_EXEC 0x01 /* Pages can be executed. */ + + +/* Flags contain mapping type, sharing type and options. */ + +/* Mapping type (must choose one and only one of these). */ +#define MAP_FILE 0x0001 /* Mapped from a file or device. */ +#define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */ +#define MAP_TYPE 0x000f /* Mask for type field. */ + +/* Sharing types (must choose one and only one of these). */ +#define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */ +#define MAP_SHARED 0x0010 /* Share changes. */ +#define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */ + +/* Other flags. */ +#define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ +#define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */ +#define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */ +#define MAP_INHERIT 0x0800 /* Region is retained after exec. */ + +/* Advice to `madvise'. */ +#define MADV_NORMAL 0 /* No further special treatment. */ +#define MADV_RANDOM 1 /* Expect random page references. */ +#define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ +#define MADV_WILLNEED 3 /* Will need these pages. */ +#define MADV_DONTNEED 4 /* Don't need these pages. */ + +#include <sys/cdefs.h> + +__BEGIN_DECLS +/* Map addresses starting near ADDR and extending for LEN bytes. from + OFFSET into the file FD describes according to PROT and FLAGS. If ADDR + is nonzero, it is the desired mapping address. If the MAP_FIXED bit is + set in FLAGS, the mapping will be at ADDR exactly (which must be + page-aligned); otherwise the system chooses a convenient nearby address. + The return value is the actual mapping address chosen or (caddr_t) -1 + for errors (in which case `errno' is set). A successful `mmap' call + deallocates any previous mapping for the affected region. */ + +__caddr_t mmap __P ((__caddr_t __addr, size_t __len, + int __prot, int __flags, int __fd, off_t __offset)); + +/* Deallocate any mapping for the region starting at ADDR and extending LEN + bytes. Returns 0 if successful, -1 for errors (and sets errno). */ +int munmap __P ((__caddr_t __addr, size_t __len)); + +/* Change the memory protection of the region starting at ADDR and + extending LEN bytes to PROT. Returns 0 if successful, -1 for errors + (and sets errno). */ +int mprotect __P ((__caddr_t __addr, size_t __len, int __prot)); + +/* Synchronize the region starting at ADDR and extending LEN bytes with the + file it maps. Filesystem operations on a file being mapped are + unpredictable before this is done. */ +int msync __P ((__caddr_t __addr, size_t __len)); + +/* Advise the system about particular usage patterns the program follows + for the region starting at ADDR and extending LEN bytes. */ +int madvise __P ((__caddr_t __addr, size_t __len, int __advice)); + +__END_DECLS + + +#endif /* sys/mman.h */ |