Sweden-Number/server/mapping.c

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/*
* Server-side file mapping management
*
* Copyright (C) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "windef.h"
#include "winbase.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
struct mapping
{
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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 */
struct mapping *shared_next; /* next in shared PE mapping list */
struct mapping *shared_prev; /* prev in shared PE mapping list */
};
static void mapping_dump( struct object *obj, int verbose );
static struct fd *mapping_get_fd( struct object *obj );
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 */
mapping_get_fd, /* get_fd */
mapping_destroy /* destroy */
};
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static struct mapping *shared_first;
#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)
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/* find the shared PE mapping for a given mapping */
static struct file *get_shared_file( struct mapping *mapping )
{
struct mapping *ptr;
for (ptr = shared_first; ptr; ptr = ptr->shared_next)
if (is_same_file( ptr->file, mapping->file ))
return (struct file *)grab_object( ptr->shared_file );
return NULL;
}
/* 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;
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 */
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if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
/* create a temp file for the mapping */
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if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
if ((shared_fd = get_file_unix_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) &&
!(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_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;
}
free( buffer );
return 1;
error:
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release_object( mapping->shared_file );
mapping->shared_file = NULL;
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;
struct fd *fd;
int unix_fd, filepos, size;
/* load the headers */
if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
unix_fd = get_unix_fd( fd );
filepos = lseek( unix_fd, 0, SEEK_SET );
if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
/* zero out Optional header in the case it's not present or partial */
memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
/* load the section headers */
size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
if (!(sec = malloc( size ))) goto error;
if (read( unix_fd, sec, size ) != size) goto error;
if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
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if (mapping->shared_file) /* link it in the list */
{
if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
mapping->shared_prev = NULL;
shared_first = mapping;
}
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( unix_fd, filepos, SEEK_SET );
free( sec );
release_object( fd );
return 1;
error:
lseek( unix_fd, filepos, SEEK_SET );
if (sec) free( sec );
release_object( fd );
set_error( STATUS_INVALID_FILE_FOR_SECTION );
return 0;
}
/* get the size of the unix file associated with the mapping */
inline static int get_file_size( struct file *file, int *size_high, int *size_low )
{
struct stat st;
int unix_fd = get_file_unix_fd( file );
if (fstat( unix_fd, &st ) == -1) return 0;
*size_high = st.st_size >> 32;
*size_low = st.st_size & 0xffffffff;
return 1;
}
static struct object *create_mapping( int size_high, int size_low, int protect,
obj_handle_t handle, const WCHAR *name, size_t len )
{
struct mapping *mapping;
int access = 0;
if (!page_mask) init_page_size();
if (!(mapping = create_named_object( sync_namespace, &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)
{
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)
{
if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
}
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 struct fd *mapping_get_fd( struct object *obj )
{
struct mapping *mapping = (struct mapping *)obj;
return get_obj_fd( (struct object *)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 );
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if (mapping->shared_file)
{
release_object( mapping->shared_file );
if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
else shared_first = mapping->shared_next;
}
}
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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;
reply->handle = 0;
if ((obj = create_mapping( req->size_high, req->size_low,
req->protect, req->file_handle,
get_req_data(), get_req_data_size() )))
{
reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
release_object( obj );
}
}
/* open a handle to a mapping */
DECL_HANDLER(open_mapping)
{
reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
&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 )))
{
reply->size_high = mapping->size_high;
reply->size_low = mapping->size_low;
reply->protect = mapping->protect;
reply->header_size = mapping->header_size;
reply->base = mapping->base;
reply->shared_file = 0;
reply->shared_size = mapping->shared_size;
reply->removable = is_file_removable( mapping->file );
if (mapping->shared_file)
reply->shared_file = alloc_handle( current->process, mapping->shared_file,
GENERIC_READ|GENERIC_WRITE, 0 );
release_object( mapping );
}
}