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_open_file, /* open_file */
72 fd_close_handle, /* close_handle */
73 mapping_destroy /* destroy */
76 static struct list shared_list = LIST_INIT(shared_list);
80 /* These are always the same on an i386, and it will be faster this way */
81 # define page_mask 0xfff
82 # define page_shift 12
83 # define init_page_size() do { /* nothing */ } while(0)
87 static int page_shift, page_mask;
89 static void init_page_size(void)
92 # ifdef HAVE_GETPAGESIZE
93 page_size = getpagesize();
96 page_size = sysconf(_SC_PAGESIZE);
98 # error Cannot get the page size on this platform
101 page_mask = page_size - 1;
102 /* Make sure we have a power of 2 */
103 assert( !(page_size & page_mask) );
105 while ((1 << page_shift) != page_size) page_shift++;
107 #endif /* __i386__ */
109 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
112 /* find the shared PE mapping for a given mapping */
113 static struct file *get_shared_file( struct mapping *mapping )
117 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
118 if (is_same_file( ptr->file, mapping->file ))
119 return (struct file *)grab_object( ptr->shared_file );
123 /* return the size of the memory mapping and file range of a given section */
124 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
125 off_t *file_start, size_t *file_size )
127 static const unsigned int sector_align = 0x1ff;
129 if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
130 else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
132 *file_start = sec->PointerToRawData & ~sector_align;
133 *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
134 if (*file_size > *map_size) *file_size = *map_size;
137 /* allocate and fill the temp file for a shared PE image mapping */
138 static int build_shared_mapping( struct mapping *mapping, int fd,
139 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
142 size_t file_size, map_size, max_size, total_size;
143 off_t shared_pos, read_pos, write_pos;
148 /* compute the total size of the shared mapping */
150 total_size = max_size = 0;
151 for (i = 0; i < nb_sec; i++)
153 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
154 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
156 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
157 if (file_size > max_size) max_size = file_size;
158 total_size += map_size;
161 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
163 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
165 /* create a temp file for the mapping */
167 if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
168 if (!grow_file( mapping->shared_file, total_size )) goto error;
169 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
171 if (!(buffer = malloc( max_size ))) goto error;
173 /* copy the shared sections data into the temp file */
176 for (i = 0; i < nb_sec; i++)
178 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
179 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
180 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
181 write_pos = shared_pos;
182 shared_pos += map_size;
183 if (!sec[i].PointerToRawData || !file_size) continue;
187 long res = pread( fd, buffer + file_size - toread, toread, read_pos );
188 if (!res && toread < 0x200) /* partial sector at EOF is not an error */
193 if (res <= 0) goto error;
197 if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
203 release_object( mapping->shared_file );
204 mapping->shared_file = NULL;
209 /* retrieve the mapping parameters for an executable (PE) image */
210 static int get_image_params( struct mapping *mapping )
212 IMAGE_DOS_HEADER dos;
214 IMAGE_SECTION_HEADER *sec = NULL;
217 int unix_fd, size, toread;
219 /* load the headers */
221 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
222 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
223 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
224 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
227 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
229 pos += sizeof(nt.Signature);
230 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
231 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
233 pos += sizeof(nt.FileHeader);
234 /* zero out Optional header in the case it's not present or partial */
235 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
236 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
237 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
238 pos += nt.FileHeader.SizeOfOptionalHeader;
240 /* load the section headers */
242 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
243 if (!(sec = malloc( size ))) goto error;
244 if (pread( unix_fd, sec, size, pos ) != size) goto error;
246 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
248 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
250 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
251 mapping->base = (void *)nt.OptionalHeader.ImageBase;
252 mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders );
253 mapping->protect = VPROT_IMAGE;
256 if (pos + size > mapping->size) goto error;
259 release_object( fd );
264 release_object( fd );
265 set_error( STATUS_INVALID_FILE_FOR_SECTION );
269 /* get the size of the unix file associated with the mapping */
270 static inline int get_file_size( struct file *file, file_pos_t *size )
273 int unix_fd = get_file_unix_fd( file );
275 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
280 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
281 unsigned int attr, file_pos_t size, int protect,
282 obj_handle_t handle )
284 struct mapping *mapping;
287 if (!page_mask) init_page_size();
289 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
291 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
292 return &mapping->obj; /* Nothing else to do */
294 mapping->header_size = 0;
295 mapping->base = NULL;
296 mapping->shared_file = NULL;
297 mapping->shared_size = 0;
299 if (protect & VPROT_READ) access |= FILE_READ_DATA;
300 if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
304 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
305 if (protect & VPROT_IMAGE)
307 if (!get_image_params( mapping )) goto error;
308 return &mapping->obj;
312 if (!get_file_size( mapping->file, &size )) goto error;
315 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
321 if (!grow_file( mapping->file, size )) goto error;
324 else /* Anonymous mapping (no associated file) */
326 if (!size || (protect & VPROT_IMAGE))
328 set_error( STATUS_INVALID_PARAMETER );
329 mapping->file = NULL;
332 if (!(mapping->file = create_temp_file( access ))) goto error;
333 if (!grow_file( mapping->file, size )) goto error;
335 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
336 mapping->protect = protect;
337 return &mapping->obj;
340 release_object( mapping );
344 static void mapping_dump( struct object *obj, int verbose )
346 struct mapping *mapping = (struct mapping *)obj;
347 assert( obj->ops == &mapping_ops );
348 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
349 "shared_file=%p shared_size=%08x ",
350 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
351 mapping->protect, mapping->file, mapping->header_size,
352 mapping->base, mapping->shared_file, mapping->shared_size );
353 dump_object_name( &mapping->obj );
354 fputc( '\n', stderr );
357 static struct fd *mapping_get_fd( struct object *obj )
359 struct mapping *mapping = (struct mapping *)obj;
360 return get_obj_fd( (struct object *)mapping->file );
363 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
365 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
366 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
367 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
368 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
369 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
372 static void mapping_destroy( struct object *obj )
374 struct mapping *mapping = (struct mapping *)obj;
375 assert( obj->ops == &mapping_ops );
376 if (mapping->file) release_object( mapping->file );
377 if (mapping->shared_file)
379 release_object( mapping->shared_file );
380 list_remove( &mapping->shared_entry );
384 int get_page_size(void)
386 if (!page_mask) init_page_size();
387 return page_mask + 1;
390 /* create a file mapping */
391 DECL_HANDLER(create_mapping)
394 struct unicode_str name;
395 struct directory *root = NULL;
396 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
399 get_req_unicode_str( &name );
400 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
403 if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
405 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
406 release_object( obj );
409 if (root) release_object( root );
412 /* open a handle to a mapping */
413 DECL_HANDLER(open_mapping)
415 struct unicode_str name;
416 struct directory *root = NULL;
417 struct mapping *mapping;
419 get_req_unicode_str( &name );
420 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
423 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
425 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
426 release_object( mapping );
429 if (root) release_object( root );
432 /* get a mapping information */
433 DECL_HANDLER(get_mapping_info)
435 struct mapping *mapping;
438 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
441 reply->size_high = (unsigned int)(mapping->size >> 32);
442 reply->size_low = (unsigned int)mapping->size;
443 reply->protect = mapping->protect;
444 reply->header_size = mapping->header_size;
445 reply->base = mapping->base;
446 reply->shared_file = 0;
447 reply->shared_size = mapping->shared_size;
448 if ((fd = get_obj_fd( &mapping->obj )))
450 if (!is_fd_removable(fd))
451 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
452 release_object( fd );
454 if (mapping->shared_file)
456 if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
457 GENERIC_READ|GENERIC_WRITE, 0 )))
459 if (reply->mapping) close_handle( current->process, reply->mapping );
462 release_object( mapping );