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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "apr_mmap.h"
#include "apr_errno.h"
#include "apr_arch_file_io.h"
#include "apr_portable.h"
/* System headers required for the mmap library */
#ifdef BEOS
#include <kernel/OS.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#if APR_HAS_MMAP || defined(BEOS)
static apr_status_t mmap_cleanup(void *themmap)
{
apr_mmap_t *mm = themmap;
apr_mmap_t *next = APR_RING_NEXT(mm,link);
int rv = 0;
/* we no longer refer to the mmaped region */
APR_RING_REMOVE(mm,link);
APR_RING_NEXT(mm,link) = NULL;
APR_RING_PREV(mm,link) = NULL;
if (next != mm) {
/* more references exist, so we're done */
return APR_SUCCESS;
}
#ifdef BEOS
rv = delete_area(mm->area);
#else
rv = munmap(mm->mm, mm->size);
#endif
mm->mm = (void *)-1;
if (rv == 0) {
return APR_SUCCESS;
}
return errno;
}
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)
{
void *mm;
#ifdef BEOS
area_id aid = -1;
uint32 pages = 0;
#else
apr_int32_t native_flags = 0;
#endif
#if APR_HAS_LARGE_FILES && defined(HAVE_MMAP64)
#define mmap mmap64
#elif APR_HAS_LARGE_FILES && SIZEOF_OFF_T == 4
/* LFS but no mmap64: check for overflow */
if ((apr_int64_t)offset + size > INT_MAX)
return APR_EINVAL;
#endif
if (size == 0)
return APR_EINVAL;
if (file == NULL || file->filedes == -1 || file->buffered)
return APR_EBADF;
(*new) = (apr_mmap_t *)apr_pcalloc(cont, sizeof(apr_mmap_t));
#ifdef BEOS
/* XXX: mmap shouldn't really change the seek offset */
apr_file_seek(file, APR_SET, &offset);
/* There seems to be some strange interactions that mean our area must
* be set as READ & WRITE or writev will fail! Go figure...
* So we ignore the value in flags and always ask for both READ and WRITE
*/
pages = (size + B_PAGE_SIZE -1) / B_PAGE_SIZE;
aid = create_area("apr_mmap", &mm , B_ANY_ADDRESS, pages * B_PAGE_SIZE,
B_NO_LOCK, B_WRITE_AREA|B_READ_AREA);
if (aid < B_NO_ERROR) {
/* we failed to get an area we can use... */
*new = NULL;
return APR_ENOMEM;
}
if (aid >= B_NO_ERROR)
read(file->filedes, mm, size);
(*new)->area = aid;
#else
if (flag & APR_MMAP_WRITE) {
native_flags |= PROT_WRITE;
}
if (flag & APR_MMAP_READ) {
native_flags |= PROT_READ;
}
mm = mmap(NULL, size, native_flags, MAP_SHARED, file->filedes, offset);
if (mm == (void *)-1) {
/* we failed to get an mmap'd file... */
*new = NULL;
return errno;
}
#endif
(*new)->mm = mm;
(*new)->size = size;
(*new)->cntxt = cont;
APR_RING_ELEM_INIT(*new, link);
/* 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)
{
*new_mmap = (apr_mmap_t *)apr_pmemdup(p, old_mmap, sizeof(apr_mmap_t));
(*new_mmap)->cntxt = p;
APR_RING_INSERT_AFTER(old_mmap, *new_mmap, link);
apr_pool_cleanup_register(p, *new_mmap, mmap_cleanup,
apr_pool_cleanup_null);
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
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