mirror of
git://source.winehq.org/git/wine.git
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ebe29ef376
- merged request and reply structures - build requests directly into the buffer to avoid a copy
191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
/*
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* Server-side file mapping management
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*
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* Copyright (C) 1999 Alexandre Julliard
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "winerror.h"
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#include "winnt.h"
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#include "winbase.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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struct mapping
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{
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struct object obj; /* object header */
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int size_high; /* mapping size */
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int size_low; /* mapping size */
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int protect; /* protection flags */
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struct file *file; /* file mapped */
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};
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static void mapping_dump( struct object *obj, int verbose );
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static void mapping_destroy( struct object *obj );
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static const struct object_ops mapping_ops =
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{
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sizeof(struct mapping),
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mapping_dump,
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no_add_queue,
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NULL, /* should never get called */
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NULL, /* should never get called */
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NULL, /* should never get called */
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no_read_fd,
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no_write_fd,
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no_flush,
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no_get_file_info,
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mapping_destroy
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};
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#ifdef __i386__
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/* These are always the same on an i386, and it will be faster this way */
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# define page_mask 0xfff
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# define page_shift 12
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# define init_page_size() /* nothing */
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#else /* __i386__ */
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static int page_shift, page_mask;
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static void init_page_size(void)
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{
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int page_size;
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# ifdef HAVE_GETPAGESIZE
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page_size = getpagesize();
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# else
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# ifdef __svr4__
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page_size = sysconf(_SC_PAGESIZE);
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# else
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# error Cannot get the page size on this platform
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# endif
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# endif
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page_mask = page_size - 1;
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/* Make sure we have a power of 2 */
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assert( !(page_size & page_mask) );
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page_shift = 0;
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while ((1 << page_shift) != page_size) page_shift++;
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}
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#endif /* __i386__ */
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#define ROUND_ADDR(addr) \
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((int)(addr) & ~page_mask)
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#define ROUND_SIZE(addr,size) \
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(((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
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static struct object *create_mapping( int size_high, int size_low, int protect,
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int handle, const char *name, size_t len )
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{
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struct mapping *mapping;
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int access = 0;
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if (!page_mask) init_page_size();
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if (!(mapping = create_named_object( &mapping_ops, name, len )))
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return NULL;
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if (get_error() == ERROR_ALREADY_EXISTS)
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return &mapping->obj; /* Nothing else to do */
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if (protect & VPROT_READ) access |= GENERIC_READ;
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if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
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if (handle != -1)
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{
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if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
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if (!size_high && !size_low)
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{
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struct get_file_info_request req;
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struct object *obj = (struct object *)mapping->file;
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obj->ops->get_file_info( obj, &req );
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size_high = req.size_high;
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size_low = ROUND_SIZE( 0, req.size_low );
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}
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else if (!grow_file( mapping->file, size_high, size_low )) goto error;
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}
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else /* Anonymous mapping (no associated file) */
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{
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if (!size_high && !size_low)
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{
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set_error( ERROR_INVALID_PARAMETER );
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mapping->file = NULL;
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goto error;
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}
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if (!(mapping->file = create_temp_file( access ))) goto error;
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if (!grow_file( mapping->file, size_high, size_low )) goto error;
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}
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mapping->size_high = size_high;
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mapping->size_low = ROUND_SIZE( 0, size_low );
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mapping->protect = protect;
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return &mapping->obj;
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error:
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release_object( mapping );
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return NULL;
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}
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static void mapping_dump( struct object *obj, int verbose )
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{
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struct mapping *mapping = (struct mapping *)obj;
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assert( obj->ops == &mapping_ops );
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fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p name='%s'\n",
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mapping->size_high, mapping->size_low, mapping->protect,
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mapping->file, get_object_name( &mapping->obj ) );
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}
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static void mapping_destroy( struct object *obj )
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{
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struct mapping *mapping = (struct mapping *)obj;
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assert( obj->ops == &mapping_ops );
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if (mapping->file) release_object( mapping->file );
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}
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/* create a file mapping */
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DECL_HANDLER(create_mapping)
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{
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size_t len = get_req_strlen( req->name );
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struct object *obj;
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req->handle = -1;
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if ((obj = create_mapping( req->size_high, req->size_low,
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req->protect, req->file_handle, req->name, len )))
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{
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int access = FILE_MAP_ALL_ACCESS;
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if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
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req->handle = alloc_handle( current->process, obj, access, req->inherit );
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release_object( obj );
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}
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}
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/* open a handle to a mapping */
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DECL_HANDLER(open_mapping)
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{
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size_t len = get_req_strlen( req->name );
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req->handle = open_object( req->name, len, &mapping_ops, req->access, req->inherit );
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}
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/* get a mapping information */
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DECL_HANDLER(get_mapping_info)
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{
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struct mapping *mapping;
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if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
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0, &mapping_ops )))
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{
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req->size_high = mapping->size_high;
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req->size_low = mapping->size_low;
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req->protect = mapping->protect;
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if (mapping->file) set_reply_fd( current, file_get_mmap_fd( mapping->file ) );
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release_object( mapping );
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}
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}
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