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Sweden-Number/server/mapping.c

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C
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/*
* Server-side file mapping management
*
* Copyright (C) 1999 Alexandre Julliard
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "winnt.h"
#include "winbase.h"
#include "handle.h"
#include "thread.h"
#include "request.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 */
int header_size; /* size of headers (for PE image mapping) */
void *base; /* default base addr (for PE image mapping) */
struct file *shared_file; /* temp file for shared PE mapping */
int shared_size; /* shared mapping total size */
};
static int mapping_get_fd( struct object *obj );
static void mapping_dump( struct object *obj, int verbose );
static void mapping_destroy( struct object *obj );
static const struct object_ops mapping_ops =
{
sizeof(struct mapping), /* size */
mapping_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
mapping_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
mapping_destroy /* destroy */
};
#ifdef __i386__
/* These are always the same on an i386, and it will be faster this way */
# define page_mask 0xfff
# define page_shift 12
# define init_page_size() do { /* nothing */ } while(0)
#else /* __i386__ */
static int page_shift, page_mask;
static void init_page_size(void)
{
int page_size;
# ifdef HAVE_GETPAGESIZE
page_size = getpagesize();
# else
# ifdef __svr4__
page_size = sysconf(_SC_PAGESIZE);
# else
# error Cannot get the page size on this platform
# endif
# endif
page_mask = page_size - 1;
/* Make sure we have a power of 2 */
assert( !(page_size & page_mask) );
page_shift = 0;
while ((1 << page_shift) != page_size) page_shift++;
}
#endif /* __i386__ */
#define ROUND_ADDR(addr) \
((int)(addr) & ~page_mask)
#define ROUND_SIZE(addr,size) \
(((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
/* get the fd to use for mmaping a file */
inline static int get_mmap_fd( struct file *file )
{
struct object *obj;
if (!(obj = (struct object *)file)) return -1;
return obj->ops->get_fd( obj );
}
/* allocate and fill the temp file for a shared PE image mapping */
static int build_shared_mapping( struct mapping *mapping, int fd,
IMAGE_SECTION_HEADER *sec, int nb_sec )
{
int i, max_size, total_size, pos;
char *buffer = NULL;
int shared_fd = -1;
long toread;
/* compute the total size of the shared mapping */
total_size = max_size = 0;
for (i = 0; i < nb_sec; i++)
{
if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
{
int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
if (size > max_size) max_size = size;
total_size += size;
}
}
if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
/* create a temp file for the mapping */
if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) goto error;
if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
if ((shared_fd = get_mmap_fd( mapping->shared_file )) == -1) goto error;
if (!(buffer = malloc( max_size ))) goto error;
/* copy the shared sections data into the temp file */
for (i = pos = 0; i < nb_sec; i++)
{
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
toread = sec[i].SizeOfRawData;
while (toread)
{
long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
if (res <= 0) goto error;
toread -= res;
}
if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
}
close( shared_fd );
free( buffer );
return 1;
error:
if (shared_fd != -1) close( shared_fd );
if (buffer) free( buffer );
return 0;
}
/* retrieve the mapping parameters for an executable (PE) image */
static int get_image_params( struct mapping *mapping )
{
IMAGE_DOS_HEADER dos;
IMAGE_NT_HEADERS nt;
IMAGE_SECTION_HEADER *sec = NULL;
int fd, filepos, size;
/* load the headers */
if ((fd = get_mmap_fd( mapping->file )) == -1) return 0;
filepos = lseek( fd, 0, SEEK_SET );
if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
/* load the section headers */
size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
if (!(sec = malloc( size ))) goto error;
if (read( fd, sec, size ) != size) goto error;
if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
mapping->size_high = 0;
mapping->base = (void *)nt.OptionalHeader.ImageBase;
mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
mapping->protect = VPROT_IMAGE;
/* sanity check */
if (mapping->header_size > mapping->size_low) goto error;
lseek( fd, filepos, SEEK_SET );
close( fd );
free( sec );
return 1;
error:
lseek( fd, filepos, SEEK_SET );
close( fd );
if (sec) free( sec );
set_error( STATUS_INVALID_FILE_FOR_SECTION );
return 0;
}
static struct object *create_mapping( int size_high, int size_low, int protect,
int handle, const WCHAR *name, size_t len )
{
struct mapping *mapping;
int access = 0;
if (!page_mask) init_page_size();
if (!(mapping = create_named_object( &mapping_ops, name, len )))
return NULL;
if (get_error() == STATUS_OBJECT_NAME_COLLISION)
return &mapping->obj; /* Nothing else to do */
mapping->header_size = 0;
mapping->base = NULL;
mapping->shared_file = NULL;
mapping->shared_size = 0;
if (protect & VPROT_READ) access |= GENERIC_READ;
if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
if (handle != -1)
{
if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
if (protect & VPROT_IMAGE)
{
if (!get_image_params( mapping )) goto error;
return &mapping->obj;
}
if (!size_high && !size_low)
{
struct get_file_info_request req;
struct object *obj = (struct object *)mapping->file;
obj->ops->get_file_info( obj, &req );
size_high = req.size_high;
size_low = ROUND_SIZE( 0, req.size_low );
}
else if (!grow_file( mapping->file, size_high, size_low )) goto error;
}
else /* Anonymous mapping (no associated file) */
{
if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
{
set_error( STATUS_INVALID_PARAMETER );
mapping->file = NULL;
goto error;
}
if (!(mapping->file = create_temp_file( access ))) goto error;
if (!grow_file( mapping->file, size_high, size_low )) goto error;
}
mapping->size_high = size_high;
mapping->size_low = ROUND_SIZE( 0, size_low );
mapping->protect = protect;
return &mapping->obj;
error:
release_object( mapping );
return NULL;
}
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 header_size=%08x base=%p "
"shared_file=%p shared_size=%08x ",
mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
dump_object_name( &mapping->obj );
fputc( '\n', stderr );
}
static int mapping_get_fd( struct object *obj )
{
struct mapping *mapping = (struct mapping *)obj;
assert( obj->ops == &mapping_ops );
return get_mmap_fd( mapping->file );
}
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 );
if (mapping->shared_file) release_object( mapping->shared_file );
}
int get_page_size(void)
{
if (!page_mask) init_page_size();
return page_mask + 1;
}
/* create a file mapping */
DECL_HANDLER(create_mapping)
{
struct object *obj;
req->handle = -1;
if ((obj = create_mapping( req->size_high, req->size_low,
req->protect, req->file_handle,
get_req_data(req), get_req_data_size(req) )))
{
int access = FILE_MAP_ALL_ACCESS;
if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
req->handle = alloc_handle( current->process, obj, access, req->inherit );
release_object( obj );
}
}
/* open a handle to a mapping */
DECL_HANDLER(open_mapping)
{
req->handle = open_object( get_req_data(req), get_req_data_size(req),
&mapping_ops, req->access, req->inherit );
}
/* get a mapping information */
DECL_HANDLER(get_mapping_info)
{
struct mapping *mapping;
if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
0, &mapping_ops )))
{
req->size_high = mapping->size_high;
req->size_low = mapping->size_low;
req->protect = mapping->protect;
req->header_size = mapping->header_size;
req->base = mapping->base;
req->shared_file = -1;
req->shared_size = mapping->shared_size;
req->anonymous = !mapping->file;
if (mapping->shared_file)
req->shared_file = alloc_handle( current->process, mapping->shared_file,
GENERIC_READ|GENERIC_WRITE, 0 );
release_object( mapping );
}
}
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