/* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2000-2002 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. 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For more * information on the Apache Software Foundation, please see * . */ #include "apr.h" #include "apr_private.h" #include "apr_general.h" #include "apr_mmap.h" #include "apr_errno.h" #include "fileio.h" #include "apr_portable.h" #include "apr_strings.h" #if APR_HAS_MMAP static apr_status_t mmap_cleanup(void *themmap) { apr_mmap_t *mm = themmap; apr_status_t rv = 0; if (!mm->is_owner) { return APR_EINVAL; } else if (!mm->mhandle) { return APR_ENOENT; } if (mm->mv) { if (!UnmapViewOfFile(mm->mv)) { apr_status_t rv = apr_get_os_error(); CloseHandle(mm->mhandle); mm->mv = NULL; mm->mhandle = NULL; return rv; } mm->mv = NULL; } if (mm->mhandle) { if (!CloseHandle(mm->mhandle)) { apr_status_t rv = apr_get_os_error(); CloseHandle(mm->mhandle); mm->mhandle = NULL; return rv; } mm->mhandle = NULL; } return APR_SUCCESS; } APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **new, apr_file_t *file, apr_off_t offset, apr_size_t size, apr_int32_t flag, apr_pool_t *cont) { static DWORD memblock = 0; DWORD fmaccess = 0; DWORD mvaccess = 0; DWORD offlo; DWORD offhi; if (flag & APR_MMAP_WRITE) fmaccess |= PAGE_READWRITE; else if (flag & APR_MMAP_READ) fmaccess |= PAGE_READONLY; if (flag & APR_MMAP_READ) mvaccess |= FILE_MAP_READ; if (flag & APR_MMAP_WRITE) mvaccess |= FILE_MAP_WRITE; if (!file || !file->filehand || file->filehand == INVALID_HANDLE_VALUE || file->buffered) return APR_EBADF; if (!memblock) { SYSTEM_INFO si; GetSystemInfo(&si); memblock = si.dwAllocationGranularity; } *new = apr_pcalloc(cont, sizeof(apr_mmap_t)); (*new)->pstart = (offset / memblock) * memblock; (*new)->poffset = offset - (*new)->pstart; (*new)->psize = (apr_size_t)((*new)->poffset) + size; /* The size of the CreateFileMapping object is the current size * of the size of the mmap object (e.g. file size), not the size * of the mapped region! */ (*new)->mhandle = CreateFileMapping(file->filehand, NULL, fmaccess, 0, 0, NULL); if (!(*new)->mhandle || (*new)->mhandle == INVALID_HANDLE_VALUE) { *new = NULL; return apr_get_os_error(); } offlo = (DWORD)(*new)->pstart; offhi = (DWORD)((*new)->pstart >> 32); (*new)->mv = MapViewOfFile((*new)->mhandle, mvaccess, offhi, offlo, (*new)->psize); if (!(*new)->mv) { apr_status_t rv = apr_get_os_error(); CloseHandle((*new)->mhandle); *new = NULL; return rv; } (*new)->mm = (char*)((*new)->mv) + (*new)->poffset; (*new)->size = size; (*new)->cntxt = cont; (*new)->is_owner = 1; /* register the cleanup... */ apr_pool_cleanup_register((*new)->cntxt, (void*)(*new), mmap_cleanup, apr_pool_cleanup_null); return APR_SUCCESS; } APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap, apr_mmap_t *old_mmap, apr_pool_t *p, int transfer_ownership) { *new_mmap = (apr_mmap_t *)apr_pmemdup(p, old_mmap, sizeof(apr_mmap_t)); (*new_mmap)->cntxt = p; /* The old_mmap can transfer ownership only if the old_mmap itself * is an owner of the mmap'ed segment. */ if (old_mmap->is_owner) { if (transfer_ownership) { (*new_mmap)->is_owner = 1; old_mmap->is_owner = 0; apr_pool_cleanup_kill(old_mmap->cntxt, old_mmap, mmap_cleanup); apr_pool_cleanup_register(p, *new_mmap, mmap_cleanup, apr_pool_cleanup_null); } else { (*new_mmap)->is_owner = 0; } } return APR_SUCCESS; } APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mm) { return apr_pool_cleanup_run(mm->cntxt, mm, mmap_cleanup); } #endif