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 default_get_sd, /* get_sd */
71 default_set_sd, /* set_sd */
72 no_lookup_name, /* lookup_name */
73 no_open_file, /* open_file */
74 fd_close_handle, /* close_handle */
75 mapping_destroy /* destroy */
78 static struct list shared_list = LIST_INIT(shared_list);
82 /* These are always the same on an i386, and it will be faster this way */
83 # define page_mask 0xfff
84 # define page_shift 12
85 # define init_page_size() do { /* nothing */ } while(0)
89 static int page_shift, page_mask;
91 static void init_page_size(void)
94 # ifdef HAVE_GETPAGESIZE
95 page_size = getpagesize();
98 page_size = sysconf(_SC_PAGESIZE);
100 # error Cannot get the page size on this platform
103 page_mask = page_size - 1;
104 /* Make sure we have a power of 2 */
105 assert( !(page_size & page_mask) );
107 while ((1 << page_shift) != page_size) page_shift++;
109 #endif /* __i386__ */
111 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
114 /* find the shared PE mapping for a given mapping */
115 static struct file *get_shared_file( struct mapping *mapping )
119 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
120 if (is_same_file( ptr->file, mapping->file ))
121 return (struct file *)grab_object( ptr->shared_file );
125 /* return the size of the memory mapping and file range of a given section */
126 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
127 off_t *file_start, size_t *file_size )
129 static const unsigned int sector_align = 0x1ff;
131 if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
132 else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
134 *file_start = sec->PointerToRawData & ~sector_align;
135 *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
136 if (*file_size > *map_size) *file_size = *map_size;
139 /* allocate and fill the temp file for a shared PE image mapping */
140 static int build_shared_mapping( struct mapping *mapping, int fd,
141 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
144 size_t file_size, map_size, max_size, total_size;
145 off_t shared_pos, read_pos, write_pos;
150 /* compute the total size of the shared mapping */
152 total_size = max_size = 0;
153 for (i = 0; i < nb_sec; i++)
155 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
156 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
158 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
159 if (file_size > max_size) max_size = file_size;
160 total_size += map_size;
163 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
165 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
167 /* create a temp file for the mapping */
169 if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
170 if (!grow_file( mapping->shared_file, total_size )) goto error;
171 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
173 if (!(buffer = malloc( max_size ))) goto error;
175 /* copy the shared sections data into the temp file */
178 for (i = 0; i < nb_sec; i++)
180 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
181 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
182 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
183 write_pos = shared_pos;
184 shared_pos += map_size;
185 if (!sec[i].PointerToRawData || !file_size) continue;
189 long res = pread( fd, buffer + file_size - toread, toread, read_pos );
190 if (!res && toread < 0x200) /* partial sector at EOF is not an error */
195 if (res <= 0) goto error;
199 if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
205 release_object( mapping->shared_file );
206 mapping->shared_file = NULL;
211 /* retrieve the mapping parameters for an executable (PE) image */
212 static int get_image_params( struct mapping *mapping )
214 IMAGE_DOS_HEADER dos;
216 IMAGE_SECTION_HEADER *sec = NULL;
219 int unix_fd, size, toread;
221 /* load the headers */
223 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
224 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
225 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
226 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
229 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
231 pos += sizeof(nt.Signature);
232 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
233 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
235 pos += sizeof(nt.FileHeader);
236 /* zero out Optional header in the case it's not present or partial */
237 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
238 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
239 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
240 pos += nt.FileHeader.SizeOfOptionalHeader;
242 /* load the section headers */
244 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
245 if (!(sec = malloc( size ))) goto error;
246 if (pread( unix_fd, sec, size, pos ) != size) goto error;
248 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
250 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
252 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
253 mapping->base = (void *)nt.OptionalHeader.ImageBase;
254 mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders );
255 mapping->protect = VPROT_IMAGE;
258 if (pos + size > mapping->size) goto error;
261 release_object( fd );
266 release_object( fd );
267 set_error( STATUS_INVALID_FILE_FOR_SECTION );
271 /* get the size of the unix file associated with the mapping */
272 static inline int get_file_size( struct file *file, file_pos_t *size )
275 int unix_fd = get_file_unix_fd( file );
277 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
282 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
283 unsigned int attr, file_pos_t size, int protect,
284 obj_handle_t handle )
286 struct mapping *mapping;
289 if (!page_mask) init_page_size();
291 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
293 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
294 return &mapping->obj; /* Nothing else to do */
296 mapping->header_size = 0;
297 mapping->base = NULL;
298 mapping->shared_file = NULL;
299 mapping->shared_size = 0;
301 if (protect & VPROT_READ) access |= FILE_READ_DATA;
302 if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
306 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
307 if (protect & VPROT_IMAGE)
309 if (!get_image_params( mapping )) goto error;
310 return &mapping->obj;
314 if (!get_file_size( mapping->file, &size )) goto error;
317 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
323 if (!grow_file( mapping->file, size )) goto error;
326 else /* Anonymous mapping (no associated file) */
328 if (!size || (protect & VPROT_IMAGE))
330 set_error( STATUS_INVALID_PARAMETER );
331 mapping->file = NULL;
334 if (!(mapping->file = create_temp_file( access ))) goto error;
335 if (!grow_file( mapping->file, size )) goto error;
337 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
338 mapping->protect = protect;
339 return &mapping->obj;
342 release_object( mapping );
346 static void mapping_dump( struct object *obj, int verbose )
348 struct mapping *mapping = (struct mapping *)obj;
349 assert( obj->ops == &mapping_ops );
350 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
351 "shared_file=%p shared_size=%08x ",
352 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
353 mapping->protect, mapping->file, mapping->header_size,
354 mapping->base, mapping->shared_file, mapping->shared_size );
355 dump_object_name( &mapping->obj );
356 fputc( '\n', stderr );
359 static struct fd *mapping_get_fd( struct object *obj )
361 struct mapping *mapping = (struct mapping *)obj;
362 return get_obj_fd( (struct object *)mapping->file );
365 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
367 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
368 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
369 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
370 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
371 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
374 static void mapping_destroy( struct object *obj )
376 struct mapping *mapping = (struct mapping *)obj;
377 assert( obj->ops == &mapping_ops );
378 if (mapping->file) release_object( mapping->file );
379 if (mapping->shared_file)
381 release_object( mapping->shared_file );
382 list_remove( &mapping->shared_entry );
386 int get_page_size(void)
388 if (!page_mask) init_page_size();
389 return page_mask + 1;
392 /* create a file mapping */
393 DECL_HANDLER(create_mapping)
396 struct unicode_str name;
397 struct directory *root = NULL;
398 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
401 get_req_unicode_str( &name );
402 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
405 if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
407 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
408 release_object( obj );
411 if (root) release_object( root );
414 /* open a handle to a mapping */
415 DECL_HANDLER(open_mapping)
417 struct unicode_str name;
418 struct directory *root = NULL;
419 struct mapping *mapping;
421 get_req_unicode_str( &name );
422 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
425 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
427 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
428 release_object( mapping );
431 if (root) release_object( root );
434 /* get a mapping information */
435 DECL_HANDLER(get_mapping_info)
437 struct mapping *mapping;
440 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
443 reply->size_high = (unsigned int)(mapping->size >> 32);
444 reply->size_low = (unsigned int)mapping->size;
445 reply->protect = mapping->protect;
446 reply->header_size = mapping->header_size;
447 reply->base = mapping->base;
448 reply->shared_file = 0;
449 reply->shared_size = mapping->shared_size;
450 if ((fd = get_obj_fd( &mapping->obj )))
452 if (!is_fd_removable(fd))
453 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
454 release_object( fd );
456 if (mapping->shared_file)
458 if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
459 GENERIC_READ|GENERIC_WRITE, 0 )))
461 if (reply->mapping) close_handle( current->process, reply->mapping );
464 release_object( mapping );