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026355d34a
- Put 'my_getpagesize' in it's own .c file - Map the call 'my_getpagesize' directly to 'getpagesize' if it exists - Add default implementation for 'my_getpagesize' to be used if no platform specfic function exists include/my_sys.h: Break out the defines for my_getpagesize from HAVE_SYS_MMAN_H as they don't depend on that. There is a check for the function in configure which defines HAVE_GETPAGESIZE if the function exists mysys/CMakeLists.txt: Add new fil my_getpagesize.c mysys/Makefile.am: Add new fil my_getpagesize.c mysys/my_mmap.c: Remove my_getpagesize from my_mmap.c as it's now implemented in my_getpagesize.c mysys/my_getpagesize.c: New BitKeeper file ``mysys/my_getpagesize.c''
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* Copyright (C) 2000-2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "mysys_priv.h"
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#ifdef HAVE_SYS_MMAN_H
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/*
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system msync() only syncs mmap'ed area to fs cache.
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fsync() is required to really sync to disc
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*/
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int my_msync(int fd, void *addr, size_t len, int flags)
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{
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msync(addr, len, flags);
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return my_sync(fd, MYF(0));
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}
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#elif defined(__WIN__)
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static SECURITY_ATTRIBUTES mmap_security_attributes=
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{sizeof(SECURITY_ATTRIBUTES), 0, TRUE};
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void *my_mmap(void *addr, size_t len, int prot,
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int flags, int fd, my_off_t offset)
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{
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DWORD flProtect=0;
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HANDLE hFileMap;
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LPVOID ptr;
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HANDLE hFile= (HANDLE)_get_osfhandle(fd);
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if (hFile == INVALID_HANDLE_VALUE)
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return MAP_FAILED;
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flProtect|=SEC_COMMIT;
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hFileMap=CreateFileMapping(hFile, &mmap_security_attributes,
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PAGE_READWRITE, 0, (DWORD) len, NULL);
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if (hFileMap == 0)
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return MAP_FAILED;
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ptr=MapViewOfFile(hFileMap,
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flags & PROT_WRITE ? FILE_MAP_WRITE : FILE_MAP_READ,
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(DWORD)(offset >> 32), (DWORD)offset, len);
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/*
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MSDN explicitly states that it's possible to close File Mapping Object
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even when a view is not unmapped - then the object will be held open
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implicitly until unmap, as every view stores internally a handler of
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a corresponding File Mapping Object
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*/
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CloseHandle(hFileMap);
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if (ptr)
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return ptr;
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return MAP_FAILED;
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}
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int my_munmap(void *addr, size_t len)
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{
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return UnmapViewOfFile(addr) ? 0 : -1;
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}
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int my_msync(int fd, void *addr, size_t len, int flags)
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{
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return FlushViewOfFile(addr, len) ? 0 : -1;
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}
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#else
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#warning "no mmap!"
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#endif
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