Sweden-Number/server/mapping.c

110 lines
3.1 KiB
C

/*
* Server-side file mapping management
*
* Copyright (C) 1999 Alexandre Julliard
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "winerror.h"
#include "winnt.h"
#include "server/process.h"
#include "server/thread.h"
struct mapping
{
struct object obj; /* object header */
int size_high; /* mapping size */
int size_low; /* mapping size */
int protect; /* protection flags */
struct file *file; /* file mapped */
};
static void mapping_dump( struct object *obj, int verbose );
static void mapping_destroy( struct object *obj );
static const struct object_ops mapping_ops =
{
mapping_dump,
no_add_queue,
NULL, /* should never get called */
NULL, /* should never get called */
NULL, /* should never get called */
no_read_fd,
no_write_fd,
no_flush,
no_get_file_info,
mapping_destroy
};
struct object *create_mapping( int size_high, int size_low, int protect,
int handle, const char *name )
{
struct mapping *mapping;
if (!(mapping = (struct mapping *)create_named_object( name, &mapping_ops,
sizeof(*mapping) )))
return NULL;
if (GET_ERROR() == ERROR_ALREADY_EXISTS)
return &mapping->obj; /* Nothing else to do */
mapping->size_high = size_high;
mapping->size_low = size_low;
mapping->protect = protect;
if (handle != -1)
{
int access = 0;
if (protect & VPROT_READ) access |= GENERIC_READ;
if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
if (!(mapping->file = get_file_obj( current->process, handle, access )))
{
release_object( mapping );
return NULL;
}
}
else mapping->file = NULL;
return &mapping->obj;
}
int open_mapping( unsigned int access, int inherit, const char *name )
{
return open_object( name, &mapping_ops, access, inherit );
}
int get_mapping_info( int handle, struct get_mapping_info_reply *reply )
{
struct mapping *mapping;
int fd;
if (!(mapping = (struct mapping *)get_handle_obj( current->process, handle,
0, &mapping_ops )))
return -1;
reply->size_high = mapping->size_high;
reply->size_low = mapping->size_low;
reply->protect = mapping->protect;
if (mapping->file) fd = file_get_mmap_fd( mapping->file );
else fd = -1;
release_object( mapping );
return fd;
}
static void mapping_dump( struct object *obj, int verbose )
{
struct mapping *mapping = (struct mapping *)obj;
assert( obj->ops == &mapping_ops );
fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p name='%s'\n",
mapping->size_high, mapping->size_low, mapping->protect,
mapping->file, get_object_name( &mapping->obj ) );
}
static void mapping_destroy( struct object *obj )
{
struct mapping *mapping = (struct mapping *)obj;
assert( obj->ops == &mapping_ops );
if (mapping->file) release_object( mapping->file );
free( mapping );
}