2 * Server-side file mapping management
4 * Copyright (C) 1999 Alexandre Julliard
22 struct object obj; /* object header */
23 int size_high; /* mapping size */
24 int size_low; /* mapping size */
25 int protect; /* protection flags */
26 struct file *file; /* file mapped */
27 int header_size; /* size of headers (for PE image mapping) */
28 void *base; /* default base addr (for PE image mapping) */
29 struct file *shared_file; /* temp file for shared PE mapping */
30 int shared_size; /* shared mapping total size */
31 struct mapping *shared_next; /* next in shared PE mapping list */
32 struct mapping *shared_prev; /* prev in shared PE mapping list */
35 static int mapping_get_fd( struct object *obj );
36 static int mapping_get_info( struct object *obj, struct get_file_info_request *req );
37 static void mapping_dump( struct object *obj, int verbose );
38 static void mapping_destroy( struct object *obj );
40 static const struct object_ops mapping_ops =
42 sizeof(struct mapping), /* size */
43 mapping_dump, /* dump */
44 no_add_queue, /* add_queue */
45 NULL, /* remove_queue */
48 NULL, /* get_poll_events */
49 NULL, /* poll_event */
50 mapping_get_fd, /* get_fd */
52 mapping_get_info, /* get_file_info */
53 mapping_destroy /* destroy */
56 static struct mapping *shared_first;
60 /* These are always the same on an i386, and it will be faster this way */
61 # define page_mask 0xfff
62 # define page_shift 12
63 # define init_page_size() do { /* nothing */ } while(0)
67 static int page_shift, page_mask;
69 static void init_page_size(void)
72 # ifdef HAVE_GETPAGESIZE
73 page_size = getpagesize();
76 page_size = sysconf(_SC_PAGESIZE);
78 # error Cannot get the page size on this platform
81 page_mask = page_size - 1;
82 /* Make sure we have a power of 2 */
83 assert( !(page_size & page_mask) );
85 while ((1 << page_shift) != page_size) page_shift++;
89 #define ROUND_ADDR(addr) \
90 ((int)(addr) & ~page_mask)
92 #define ROUND_SIZE(addr,size) \
93 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
95 /* get the fd to use for mmaping a file */
96 inline static int get_mmap_fd( struct file *file )
99 if (!(obj = (struct object *)file))
101 set_error( STATUS_INVALID_HANDLE );
104 return obj->ops->get_fd( obj );
107 /* find the shared PE mapping for a given mapping */
108 static struct file *get_shared_file( struct mapping *mapping )
112 for (ptr = shared_first; ptr; ptr = ptr->shared_next)
113 if (is_same_file( ptr->file, mapping->file ))
114 return (struct file *)grab_object( ptr->shared_file );
118 /* allocate and fill the temp file for a shared PE image mapping */
119 static int build_shared_mapping( struct mapping *mapping, int fd,
120 IMAGE_SECTION_HEADER *sec, int nb_sec )
122 int i, max_size, total_size, pos;
127 /* compute the total size of the shared mapping */
129 total_size = max_size = 0;
130 for (i = 0; i < nb_sec; i++)
132 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
133 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
135 int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
136 if (size > max_size) max_size = size;
140 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
142 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
144 /* create a temp file for the mapping */
146 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) goto error;
147 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
148 if ((shared_fd = get_mmap_fd( mapping->shared_file )) == -1) goto error;
150 if (!(buffer = malloc( max_size ))) goto error;
152 /* copy the shared sections data into the temp file */
154 for (i = pos = 0; i < nb_sec; i++)
156 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
157 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
158 if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
159 pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
160 if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
161 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
162 if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
163 toread = sec[i].SizeOfRawData;
166 long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
167 if (res <= 0) goto error;
170 if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
176 if (buffer) free( buffer );
180 /* retrieve the mapping parameters for an executable (PE) image */
181 static int get_image_params( struct mapping *mapping )
183 IMAGE_DOS_HEADER dos;
185 IMAGE_SECTION_HEADER *sec = NULL;
186 int fd, filepos, size;
188 /* load the headers */
190 if ((fd = get_mmap_fd( mapping->file )) == -1) return 0;
191 filepos = lseek( fd, 0, SEEK_SET );
192 if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
193 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
194 if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
195 if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
196 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
198 /* load the section headers */
200 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
201 if (!(sec = malloc( size ))) goto error;
202 if (read( fd, sec, size ) != size) goto error;
204 if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
206 if (mapping->shared_file) /* link it in the list */
208 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
209 mapping->shared_prev = NULL;
210 shared_first = mapping;
213 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
214 mapping->size_high = 0;
215 mapping->base = (void *)nt.OptionalHeader.ImageBase;
216 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
217 mapping->protect = VPROT_IMAGE;
220 if (mapping->header_size > mapping->size_low) goto error;
222 lseek( fd, filepos, SEEK_SET );
227 lseek( fd, filepos, SEEK_SET );
228 if (sec) free( sec );
229 set_error( STATUS_INVALID_FILE_FOR_SECTION );
234 static struct object *create_mapping( int size_high, int size_low, int protect,
235 handle_t handle, const WCHAR *name, size_t len )
237 struct mapping *mapping;
240 if (!page_mask) init_page_size();
242 if (!(mapping = create_named_object( &mapping_ops, name, len )))
244 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
245 return &mapping->obj; /* Nothing else to do */
247 mapping->header_size = 0;
248 mapping->base = NULL;
249 mapping->shared_file = NULL;
250 mapping->shared_size = 0;
252 if (protect & VPROT_READ) access |= GENERIC_READ;
253 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
257 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
258 if (protect & VPROT_IMAGE)
260 if (!get_image_params( mapping )) goto error;
261 return &mapping->obj;
263 if (!size_high && !size_low)
265 struct get_file_info_request req;
266 struct object *obj = (struct object *)mapping->file;
267 obj->ops->get_file_info( obj, &req );
268 size_high = req.size_high;
269 size_low = ROUND_SIZE( 0, req.size_low );
271 else if (!grow_file( mapping->file, size_high, size_low )) goto error;
273 else /* Anonymous mapping (no associated file) */
275 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
277 set_error( STATUS_INVALID_PARAMETER );
278 mapping->file = NULL;
281 if (!(mapping->file = create_temp_file( access ))) goto error;
282 if (!grow_file( mapping->file, size_high, size_low )) goto error;
284 mapping->size_high = size_high;
285 mapping->size_low = ROUND_SIZE( 0, size_low );
286 mapping->protect = protect;
287 return &mapping->obj;
290 release_object( mapping );
294 static void mapping_dump( struct object *obj, int verbose )
296 struct mapping *mapping = (struct mapping *)obj;
297 assert( obj->ops == &mapping_ops );
298 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
299 "shared_file=%p shared_size=%08x ",
300 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
301 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
302 dump_object_name( &mapping->obj );
303 fputc( '\n', stderr );
306 static int mapping_get_fd( struct object *obj )
308 struct mapping *mapping = (struct mapping *)obj;
309 assert( obj->ops == &mapping_ops );
310 return get_mmap_fd( mapping->file );
313 static int mapping_get_info( struct object *obj, struct get_file_info_request *req )
315 struct mapping *mapping = (struct mapping *)obj;
316 struct object *file = (struct object *)mapping->file;
318 assert( obj->ops == &mapping_ops );
320 return file->ops->get_file_info( file, req );
323 static void mapping_destroy( struct object *obj )
325 struct mapping *mapping = (struct mapping *)obj;
326 assert( obj->ops == &mapping_ops );
327 if (mapping->file) release_object( mapping->file );
328 if (mapping->shared_file)
330 release_object( mapping->shared_file );
331 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
332 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
333 else shared_first = mapping->shared_next;
337 int get_page_size(void)
339 if (!page_mask) init_page_size();
340 return page_mask + 1;
343 /* create a file mapping */
344 DECL_HANDLER(create_mapping)
349 if ((obj = create_mapping( req->size_high, req->size_low,
350 req->protect, req->file_handle,
351 get_req_data(req), get_req_data_size(req) )))
353 int access = FILE_MAP_ALL_ACCESS;
354 if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
355 req->handle = alloc_handle( current->process, obj, access, req->inherit );
356 release_object( obj );
360 /* open a handle to a mapping */
361 DECL_HANDLER(open_mapping)
363 req->handle = open_object( get_req_data(req), get_req_data_size(req),
364 &mapping_ops, req->access, req->inherit );
367 /* get a mapping information */
368 DECL_HANDLER(get_mapping_info)
370 struct mapping *mapping;
372 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
375 req->size_high = mapping->size_high;
376 req->size_low = mapping->size_low;
377 req->protect = mapping->protect;
378 req->header_size = mapping->header_size;
379 req->base = mapping->base;
380 req->shared_file = 0;
381 req->shared_size = mapping->shared_size;
382 if (mapping->shared_file)
383 req->shared_file = alloc_handle( current->process, mapping->shared_file,
384 GENERIC_READ|GENERIC_WRITE, 0 );
385 release_object( mapping );