2 * Server-side file mapping management
4 * Copyright (C) 1999 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 #include "wine/port.h"
32 #define WIN32_NO_STATUS
43 struct object obj; /* object header */
44 file_pos_t size; /* mapping size */
45 int protect; /* protection flags */
46 struct file *file; /* file mapped */
47 int header_size; /* size of headers (for PE image mapping) */
48 void *base; /* default base addr (for PE image mapping) */
49 struct file *shared_file; /* temp file for shared PE mapping */
50 int shared_size; /* shared mapping total size */
51 struct list shared_entry; /* entry in global shared PE mappings list */
54 static void mapping_dump( struct object *obj, int verbose );
55 static struct fd *mapping_get_fd( struct object *obj );
56 static unsigned int mapping_map_access( struct object *obj, unsigned int access );
57 static void mapping_destroy( struct object *obj );
59 static const struct object_ops mapping_ops =
61 sizeof(struct mapping), /* size */
62 mapping_dump, /* dump */
63 no_add_queue, /* add_queue */
64 NULL, /* remove_queue */
67 no_signal, /* signal */
68 mapping_get_fd, /* get_fd */
69 mapping_map_access, /* map_access */
70 no_lookup_name, /* lookup_name */
71 no_close_handle, /* close_handle */
72 mapping_destroy /* destroy */
75 static struct list shared_list = LIST_INIT(shared_list);
79 /* These are always the same on an i386, and it will be faster this way */
80 # define page_mask 0xfff
81 # define page_shift 12
82 # define init_page_size() do { /* nothing */ } while(0)
86 static int page_shift, page_mask;
88 static void init_page_size(void)
91 # ifdef HAVE_GETPAGESIZE
92 page_size = getpagesize();
95 page_size = sysconf(_SC_PAGESIZE);
97 # error Cannot get the page size on this platform
100 page_mask = page_size - 1;
101 /* Make sure we have a power of 2 */
102 assert( !(page_size & page_mask) );
104 while ((1 << page_shift) != page_size) page_shift++;
106 #endif /* __i386__ */
108 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
111 /* find the shared PE mapping for a given mapping */
112 static struct file *get_shared_file( struct mapping *mapping )
116 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
117 if (is_same_file( ptr->file, mapping->file ))
118 return (struct file *)grab_object( ptr->shared_file );
122 /* return the size of the memory mapping of a given section */
123 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
125 if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
126 else return ROUND_SIZE( sec->Misc.VirtualSize );
129 /* return the size of the file mapping of a given section */
130 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
132 if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
133 else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
136 /* allocate and fill the temp file for a shared PE image mapping */
137 static int build_shared_mapping( struct mapping *mapping, int fd,
138 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
140 unsigned int i, size, max_size, total_size;
141 off_t shared_pos, read_pos, write_pos;
146 /* compute the total size of the shared mapping */
148 total_size = max_size = 0;
149 for (i = 0; i < nb_sec; i++)
151 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
152 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
154 size = get_section_filemap_size( &sec[i] );
155 if (size > max_size) max_size = size;
156 total_size += get_section_map_size( &sec[i] );
159 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
161 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
163 /* create a temp file for the mapping */
165 if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
166 if (!grow_file( mapping->shared_file, total_size )) goto error;
167 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
169 if (!(buffer = malloc( max_size ))) goto error;
171 /* copy the shared sections data into the temp file */
174 for (i = 0; i < nb_sec; i++)
176 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
177 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
178 write_pos = shared_pos;
179 shared_pos += get_section_map_size( &sec[i] );
180 read_pos = sec[i].PointerToRawData;
181 size = get_section_filemap_size( &sec[i] );
182 if (!read_pos || !size) continue;
186 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
187 if (res <= 0) goto error;
191 if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
197 release_object( mapping->shared_file );
198 mapping->shared_file = NULL;
199 if (buffer) free( buffer );
203 /* retrieve the mapping parameters for an executable (PE) image */
204 static int get_image_params( struct mapping *mapping )
206 IMAGE_DOS_HEADER dos;
208 IMAGE_SECTION_HEADER *sec = NULL;
211 int unix_fd, size, toread;
213 /* load the headers */
215 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
216 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
217 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
218 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
221 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
223 pos += sizeof(nt.Signature);
224 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
225 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
227 pos += sizeof(nt.FileHeader);
228 /* zero out Optional header in the case it's not present or partial */
229 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
230 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
231 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
232 pos += nt.FileHeader.SizeOfOptionalHeader;
234 /* load the section headers */
236 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
237 if (!(sec = malloc( size ))) goto error;
238 if (pread( unix_fd, sec, size, pos ) != size) goto error;
240 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
242 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
244 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
245 mapping->base = (void *)nt.OptionalHeader.ImageBase;
246 mapping->header_size = pos + size;
247 mapping->protect = VPROT_IMAGE;
250 if (mapping->header_size > mapping->size) goto error;
253 release_object( fd );
257 if (sec) free( sec );
258 release_object( fd );
259 set_error( STATUS_INVALID_FILE_FOR_SECTION );
263 /* get the size of the unix file associated with the mapping */
264 inline static int get_file_size( struct file *file, file_pos_t *size )
267 int unix_fd = get_file_unix_fd( file );
269 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
274 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
275 unsigned int attr, file_pos_t size, int protect,
276 obj_handle_t handle )
278 struct mapping *mapping;
281 if (!page_mask) init_page_size();
283 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
285 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
286 return &mapping->obj; /* Nothing else to do */
288 mapping->header_size = 0;
289 mapping->base = NULL;
290 mapping->shared_file = NULL;
291 mapping->shared_size = 0;
293 if (protect & VPROT_READ) access |= FILE_READ_DATA;
294 if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
298 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
299 if (protect & VPROT_IMAGE)
301 if (!get_image_params( mapping )) goto error;
302 return &mapping->obj;
306 if (!get_file_size( mapping->file, &size )) goto error;
309 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
315 if (!grow_file( mapping->file, size )) goto error;
318 else /* Anonymous mapping (no associated file) */
320 if (!size || (protect & VPROT_IMAGE))
322 set_error( STATUS_INVALID_PARAMETER );
323 mapping->file = NULL;
326 if (!(mapping->file = create_temp_file( access ))) goto error;
327 if (!grow_file( mapping->file, size )) goto error;
329 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
330 mapping->protect = protect;
331 return &mapping->obj;
334 release_object( mapping );
338 static void mapping_dump( struct object *obj, int verbose )
340 struct mapping *mapping = (struct mapping *)obj;
341 assert( obj->ops == &mapping_ops );
342 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
343 "shared_file=%p shared_size=%08x ",
344 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
345 mapping->protect, mapping->file, mapping->header_size,
346 mapping->base, mapping->shared_file, mapping->shared_size );
347 dump_object_name( &mapping->obj );
348 fputc( '\n', stderr );
351 static struct fd *mapping_get_fd( struct object *obj )
353 struct mapping *mapping = (struct mapping *)obj;
354 return get_obj_fd( (struct object *)mapping->file );
357 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
359 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
360 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
361 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
362 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
363 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
366 static void mapping_destroy( struct object *obj )
368 struct mapping *mapping = (struct mapping *)obj;
369 assert( obj->ops == &mapping_ops );
370 if (mapping->file) release_object( mapping->file );
371 if (mapping->shared_file)
373 release_object( mapping->shared_file );
374 list_remove( &mapping->shared_entry );
378 int get_page_size(void)
380 if (!page_mask) init_page_size();
381 return page_mask + 1;
384 /* create a file mapping */
385 DECL_HANDLER(create_mapping)
388 struct unicode_str name;
389 struct directory *root = NULL;
390 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
393 get_req_unicode_str( &name );
394 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
397 if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
399 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
400 release_object( obj );
403 if (root) release_object( root );
406 /* open a handle to a mapping */
407 DECL_HANDLER(open_mapping)
409 struct unicode_str name;
410 struct directory *root = NULL;
411 struct mapping *mapping;
413 get_req_unicode_str( &name );
414 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
417 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
419 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
420 release_object( mapping );
423 if (root) release_object( root );
426 /* get a mapping information */
427 DECL_HANDLER(get_mapping_info)
429 struct mapping *mapping;
431 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
434 reply->size_high = (unsigned int)(mapping->size >> 32);
435 reply->size_low = (unsigned int)mapping->size;
436 reply->protect = mapping->protect;
437 reply->header_size = mapping->header_size;
438 reply->base = mapping->base;
439 reply->shared_file = 0;
440 reply->shared_size = mapping->shared_size;
441 if (mapping->shared_file)
442 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
443 GENERIC_READ|GENERIC_WRITE, 0 );
444 release_object( mapping );