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Roland McGrath
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41
sysdeps/unix/bsd/sun/sunos4/mmap.c
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sysdeps/unix/bsd/sun/sunos4/mmap.c
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/* Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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/* Map addresses starting near ADDR and extending for LEN bytes. from
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OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
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is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
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set in FLAGS, the mapping will be at ADDR exactly (which must be
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page-aligned); otherwise the system chooses a convenient nearby address.
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The return value is the actual mapping address chosen or (caddr_t) -1
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for errors (in which case `errno' is set). A successful `mmap' call
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deallocates any previous mapping for the affected region. */
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extern caddr_t __mmap_syscall (caddr_t addr, size_t len,
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int prot, int flags, int fd, off_t offset)
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caddr_t
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mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
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{
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return __mmap_syscall (addr, len, prot, flags | _MAP_NEW, fd, offset);
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}
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107
sysdeps/unix/bsd/sun/sunos4/sys/mman.h
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sysdeps/unix/bsd/sun/sunos4/sys/mman.h
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/* Definitions for BSD-style memory management. SunOS 4 version.
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Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* These are the bits used by 4.4 BSD and its derivatives. On systems
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(such as GNU) where these facilities are not system services but can be
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emulated in the C library, these are the definitions we emulate. */
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#ifndef _SYS_MMAN_H
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#define _SYS_MMAN_H 1
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#include <features.h>
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#include <gnu/types.h>
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#define __need_size_t
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#include <stddef.h>
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/* Protections are chosen from these bits, OR'd together. The
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implementation does not necessarily support PROT_EXEC or PROT_WRITE
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without PROT_READ. The only guarantees are that no writing will be
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allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
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#define PROT_NONE 0x00 /* No access. */
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#define PROT_READ 0x01 /* Pages can be read. */
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#define PROT_WRITE 0x02 /* Pages can be written. */
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#define PROT_EXEC 0x04 /* Pages can be executed. */
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/* Sharing types (must choose one and only one of these). */
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#define MAP_SHARED 0x01 /* Share changes. */
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#define MAP_PRIVATE 0x02 /* Changes private; copy pages on write. */
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#define MAP_TYPE 0x0f /* Mask for sharing type. */
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/* Other flags. */
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#define MAP_FIXED 0x10 /* Map address must be exactly as requested. */
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/* The following three flags are not actually implemented in SunOS 4.1. */
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#define MAP_RENAME 0x20 /* Rename private pages to file. */
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#define MAP_NORESERVE 0x40 /* Don't reserve needed swap area. */
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#define MAP_INHERIT 0x80 /* Region is retained after exec. */
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/* This is an internal flag that is always set in `mmap' system calls. In
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older versions of SunOS 4 `mmap' did not return the actual mapping
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address, but always returned zero. This flag says to return the
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address; the `mmap' C library function always sets it. */
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#define _MAP_NEW 0x80000000
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/* Advice to `madvise'. */
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#define MADV_NORMAL 0 /* No further special treatment. */
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#define MADV_RANDOM 1 /* Expect random page references. */
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#define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
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#define MADV_WILLNEED 3 /* Will need these pages. */
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#define MADV_DONTNEED 4 /* Don't need these pages. */
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/* Flags to `msync'. */
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#define MS_ASYNC 0x1 /* Return immediately, don't fsync. */
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#define MS_INVALIDATE 0x2 /* Invalidate caches. */
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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/* Map addresses starting near ADDR and extending for LEN bytes. from
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OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
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is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
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set in FLAGS, the mapping will be at ADDR exactly (which must be
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page-aligned); otherwise the system chooses a convenient nearby address.
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The return value is the actual mapping address chosen or (caddr_t) -1
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for errors (in which case `errno' is set). A successful `mmap' call
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deallocates any previous mapping for the affected region. */
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__caddr_t mmap __P ((__caddr_t __addr, size_t __len,
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int __prot, int __flags, int __fd, off_t __offset));
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/* Deallocate any mapping for the region starting at ADDR and extending LEN
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bytes. Returns 0 if successful, -1 for errors (and sets errno). */
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int munmap __P ((__caddr_t __addr, size_t __len));
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/* Change the memory protection of the region starting at ADDR and
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extending LEN bytes to PROT. Returns 0 if successful, -1 for errors
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(and sets errno). */
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int mprotect __P ((__caddr_t __addr, size_t __len, int __prot));
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/* Synchronize the region starting at ADDR and extending LEN bytes with the
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file it maps. Filesystem operations on a file being mapped are
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unpredictable before this is done. */
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int msync __P ((caddr_t __addr, size_t __len, int __flags));
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__END_DECLS
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#endif /* sys/mman.h */
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