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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "wine/port.h"
40 struct object obj; /* object header */
41 file_pos_t size; /* mapping size */
42 int protect; /* protection flags */
43 struct file *file; /* file mapped */
44 int header_size; /* size of headers (for PE image mapping) */
45 void *base; /* default base addr (for PE image mapping) */
46 struct file *shared_file; /* temp file for shared PE mapping */
47 int shared_size; /* shared mapping total size */
48 struct list shared_entry; /* entry in global shared PE mappings list */
51 static void mapping_dump( struct object *obj, int verbose );
52 static struct fd *mapping_get_fd( struct object *obj );
53 static void mapping_destroy( struct object *obj );
55 static const struct object_ops mapping_ops =
57 sizeof(struct mapping), /* size */
58 mapping_dump, /* dump */
59 no_add_queue, /* add_queue */
60 NULL, /* remove_queue */
63 no_signal, /* signal */
64 mapping_get_fd, /* get_fd */
65 no_close_handle, /* close_handle */
66 mapping_destroy /* destroy */
69 static struct list shared_list = LIST_INIT(shared_list);
73 /* These are always the same on an i386, and it will be faster this way */
74 # define page_mask 0xfff
75 # define page_shift 12
76 # define init_page_size() do { /* nothing */ } while(0)
80 static int page_shift, page_mask;
82 static void init_page_size(void)
85 # ifdef HAVE_GETPAGESIZE
86 page_size = getpagesize();
89 page_size = sysconf(_SC_PAGESIZE);
91 # error Cannot get the page size on this platform
94 page_mask = page_size - 1;
95 /* Make sure we have a power of 2 */
96 assert( !(page_size & page_mask) );
98 while ((1 << page_shift) != page_size) page_shift++;
100 #endif /* __i386__ */
102 #define ROUND_SIZE_MASK(addr,size,mask) \
103 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
105 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
108 /* find the shared PE mapping for a given mapping */
109 static struct file *get_shared_file( struct mapping *mapping )
113 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
114 if (is_same_file( ptr->file, mapping->file ))
115 return (struct file *)grab_object( ptr->shared_file );
119 /* allocate and fill the temp file for a shared PE image mapping */
120 static int build_shared_mapping( struct mapping *mapping, int fd,
121 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
123 unsigned int i, max_size, total_size;
124 off_t shared_pos, read_pos, write_pos;
129 /* compute the total size of the shared mapping */
131 total_size = max_size = 0;
132 for (i = 0; i < nb_sec; i++)
134 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
135 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
137 unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
138 if (size > max_size) max_size = size;
142 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
144 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
146 /* create a temp file for the mapping */
148 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
149 if (!grow_file( mapping->shared_file, total_size )) goto error;
150 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
152 if (!(buffer = malloc( max_size ))) goto error;
154 /* copy the shared sections data into the temp file */
157 for (i = 0; i < nb_sec; i++)
159 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
160 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
161 write_pos = shared_pos;
162 shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
163 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
164 read_pos = sec[i].PointerToRawData;
165 toread = sec[i].SizeOfRawData;
168 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
169 if (res <= 0) goto error;
173 if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
180 release_object( mapping->shared_file );
181 mapping->shared_file = NULL;
182 if (buffer) free( buffer );
186 /* retrieve the mapping parameters for an executable (PE) image */
187 static int get_image_params( struct mapping *mapping )
189 IMAGE_DOS_HEADER dos;
191 IMAGE_SECTION_HEADER *sec = NULL;
196 /* load the headers */
198 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
199 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
200 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
201 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
204 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
206 pos += sizeof(nt.Signature);
207 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
208 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
210 pos += sizeof(nt.FileHeader);
211 /* zero out Optional header in the case it's not present or partial */
212 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
213 if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
214 pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
215 pos += nt.FileHeader.SizeOfOptionalHeader;
217 /* load the section headers */
219 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
220 if (!(sec = malloc( size ))) goto error;
221 if (pread( unix_fd, sec, size, pos ) != size) goto error;
223 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
225 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
227 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
228 mapping->base = (void *)nt.OptionalHeader.ImageBase;
229 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
230 nt.OptionalHeader.SectionAlignment - 1 );
231 mapping->protect = VPROT_IMAGE;
234 if (mapping->header_size > mapping->size) goto error;
237 release_object( fd );
241 if (sec) free( sec );
242 release_object( fd );
243 set_error( STATUS_INVALID_FILE_FOR_SECTION );
247 /* get the size of the unix file associated with the mapping */
248 inline static int get_file_size( struct file *file, file_pos_t *size )
251 int unix_fd = get_file_unix_fd( file );
253 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
258 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
259 const WCHAR *name, size_t len )
261 struct mapping *mapping;
264 if (!page_mask) init_page_size();
266 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
268 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
269 return &mapping->obj; /* Nothing else to do */
271 mapping->header_size = 0;
272 mapping->base = NULL;
273 mapping->shared_file = NULL;
274 mapping->shared_size = 0;
276 if (protect & VPROT_READ) access |= GENERIC_READ;
277 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
281 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
282 if (protect & VPROT_IMAGE)
284 if (!get_image_params( mapping )) goto error;
285 return &mapping->obj;
289 if (!get_file_size( mapping->file, &size )) goto error;
292 set_error( STATUS_FILE_INVALID );
298 if (!grow_file( mapping->file, size )) goto error;
301 else /* Anonymous mapping (no associated file) */
303 if (!size || (protect & VPROT_IMAGE))
305 set_error( STATUS_INVALID_PARAMETER );
306 mapping->file = NULL;
309 if (!(mapping->file = create_temp_file( access ))) goto error;
310 if (!grow_file( mapping->file, size )) goto error;
312 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
313 mapping->protect = protect;
314 return &mapping->obj;
317 release_object( mapping );
321 static void mapping_dump( struct object *obj, int verbose )
323 struct mapping *mapping = (struct mapping *)obj;
324 assert( obj->ops == &mapping_ops );
325 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
326 "shared_file=%p shared_size=%08x ",
327 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
328 mapping->protect, mapping->file, mapping->header_size,
329 mapping->base, mapping->shared_file, mapping->shared_size );
330 dump_object_name( &mapping->obj );
331 fputc( '\n', stderr );
334 static struct fd *mapping_get_fd( struct object *obj )
336 struct mapping *mapping = (struct mapping *)obj;
337 return get_obj_fd( (struct object *)mapping->file );
340 static void mapping_destroy( struct object *obj )
342 struct mapping *mapping = (struct mapping *)obj;
343 assert( obj->ops == &mapping_ops );
344 if (mapping->file) release_object( mapping->file );
345 if (mapping->shared_file)
347 release_object( mapping->shared_file );
348 list_remove( &mapping->shared_entry );
352 int get_page_size(void)
354 if (!page_mask) init_page_size();
355 return page_mask + 1;
358 /* create a file mapping */
359 DECL_HANDLER(create_mapping)
362 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
365 if ((obj = create_mapping( size, req->protect, req->file_handle,
366 get_req_data(), get_req_data_size() )))
368 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
369 release_object( obj );
373 /* open a handle to a mapping */
374 DECL_HANDLER(open_mapping)
376 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
377 &mapping_ops, req->access, req->inherit );
380 /* get a mapping information */
381 DECL_HANDLER(get_mapping_info)
383 struct mapping *mapping;
385 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
388 reply->size_high = (unsigned int)(mapping->size >> 32);
389 reply->size_low = (unsigned int)mapping->size;
390 reply->protect = mapping->protect;
391 reply->header_size = mapping->header_size;
392 reply->base = mapping->base;
393 reply->shared_file = 0;
394 reply->shared_size = mapping->shared_size;
395 if (mapping->shared_file)
396 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
397 GENERIC_READ|GENERIC_WRITE, 0 );
398 release_object( mapping );