2 * Server-side file mapping management
4 * Copyright (C) 1999 Alexandre Julliard
23 struct object obj; /* object header */
24 int size_high; /* mapping size */
25 int size_low; /* mapping size */
26 int protect; /* protection flags */
27 struct file *file; /* file mapped */
28 int header_size; /* size of headers (for PE image mapping) */
29 void *base; /* default base addr (for PE image mapping) */
30 struct file *shared_file; /* temp file for shared PE mapping */
31 int shared_size; /* shared mapping total size */
32 struct mapping *shared_next; /* next in shared PE mapping list */
33 struct mapping *shared_prev; /* prev in shared PE mapping list */
36 static int mapping_get_fd( struct object *obj );
37 static int mapping_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags );
38 static void mapping_dump( struct object *obj, int verbose );
39 static void mapping_destroy( struct object *obj );
41 static const struct object_ops mapping_ops =
43 sizeof(struct mapping), /* size */
44 mapping_dump, /* dump */
45 no_add_queue, /* add_queue */
46 NULL, /* remove_queue */
49 NULL, /* get_poll_events */
50 NULL, /* poll_event */
51 mapping_get_fd, /* get_fd */
53 mapping_get_info, /* get_file_info */
54 NULL, /* queue_async */
55 mapping_destroy /* destroy */
58 static struct mapping *shared_first;
62 /* These are always the same on an i386, and it will be faster this way */
63 # define page_mask 0xfff
64 # define page_shift 12
65 # define init_page_size() do { /* nothing */ } while(0)
69 static int page_shift, page_mask;
71 static void init_page_size(void)
74 # ifdef HAVE_GETPAGESIZE
75 page_size = getpagesize();
78 page_size = sysconf(_SC_PAGESIZE);
80 # error Cannot get the page size on this platform
83 page_mask = page_size - 1;
84 /* Make sure we have a power of 2 */
85 assert( !(page_size & page_mask) );
87 while ((1 << page_shift) != page_size) page_shift++;
91 #define ROUND_ADDR(addr) \
92 ((int)(addr) & ~page_mask)
94 #define ROUND_SIZE(addr,size) \
95 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
97 /* get the fd to use for mmaping a file */
98 inline static int get_mmap_fd( struct file *file )
101 if (!(obj = (struct object *)file))
103 set_error( STATUS_INVALID_HANDLE );
106 return obj->ops->get_fd( obj );
109 /* find the shared PE mapping for a given mapping */
110 static struct file *get_shared_file( struct mapping *mapping )
114 for (ptr = shared_first; ptr; ptr = ptr->shared_next)
115 if (is_same_file( ptr->file, mapping->file ))
116 return (struct file *)grab_object( ptr->shared_file );
120 /* allocate and fill the temp file for a shared PE image mapping */
121 static int build_shared_mapping( struct mapping *mapping, int fd,
122 IMAGE_SECTION_HEADER *sec, int nb_sec )
124 int i, max_size, total_size, 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 int size = ROUND_SIZE( 0, 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 ))) goto error;
149 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
150 if ((shared_fd = get_mmap_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 */
156 for (i = pos = 0; i < nb_sec; i++)
158 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
159 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
160 if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
161 pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
162 if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
163 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
164 if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
165 toread = sec[i].SizeOfRawData;
168 long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
169 if (res <= 0) goto error;
172 if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
178 if (buffer) free( buffer );
182 /* retrieve the mapping parameters for an executable (PE) image */
183 static int get_image_params( struct mapping *mapping )
185 IMAGE_DOS_HEADER dos;
187 IMAGE_SECTION_HEADER *sec = NULL;
188 int fd, filepos, size;
190 /* load the headers */
192 if ((fd = get_mmap_fd( mapping->file )) == -1) return 0;
193 filepos = lseek( fd, 0, SEEK_SET );
194 if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
195 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
196 if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
197 if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
198 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
200 /* load the section headers */
202 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
203 if (!(sec = malloc( size ))) goto error;
204 if (read( fd, sec, size ) != size) goto error;
206 if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
208 if (mapping->shared_file) /* link it in the list */
210 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
211 mapping->shared_prev = NULL;
212 shared_first = mapping;
215 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
216 mapping->size_high = 0;
217 mapping->base = (void *)nt.OptionalHeader.ImageBase;
218 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
219 mapping->protect = VPROT_IMAGE;
222 if (mapping->header_size > mapping->size_low) goto error;
224 lseek( fd, filepos, SEEK_SET );
229 lseek( fd, filepos, SEEK_SET );
230 if (sec) free( sec );
231 set_error( STATUS_INVALID_FILE_FOR_SECTION );
236 static struct object *create_mapping( int size_high, int size_low, int protect,
237 handle_t handle, const WCHAR *name, size_t len )
239 struct mapping *mapping;
242 if (!page_mask) init_page_size();
244 if (!(mapping = create_named_object( &mapping_ops, name, len )))
246 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
247 return &mapping->obj; /* Nothing else to do */
249 mapping->header_size = 0;
250 mapping->base = NULL;
251 mapping->shared_file = NULL;
252 mapping->shared_size = 0;
254 if (protect & VPROT_READ) access |= GENERIC_READ;
255 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
259 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
260 if (protect & VPROT_IMAGE)
262 if (!get_image_params( mapping )) goto error;
263 return &mapping->obj;
265 if (!size_high && !size_low)
268 struct get_file_info_reply reply;
269 struct object *obj = (struct object *)mapping->file;
270 obj->ops->get_file_info( obj, &reply, &flags );
271 size_high = reply.size_high;
272 size_low = ROUND_SIZE( 0, reply.size_low );
274 else if (!grow_file( mapping->file, size_high, size_low )) goto error;
276 else /* Anonymous mapping (no associated file) */
278 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
280 set_error( STATUS_INVALID_PARAMETER );
281 mapping->file = NULL;
284 if (!(mapping->file = create_temp_file( access ))) goto error;
285 if (!grow_file( mapping->file, size_high, size_low )) goto error;
287 mapping->size_high = size_high;
288 mapping->size_low = ROUND_SIZE( 0, size_low );
289 mapping->protect = protect;
290 return &mapping->obj;
293 release_object( mapping );
297 static void mapping_dump( struct object *obj, int verbose )
299 struct mapping *mapping = (struct mapping *)obj;
300 assert( obj->ops == &mapping_ops );
301 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
302 "shared_file=%p shared_size=%08x ",
303 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
304 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
305 dump_object_name( &mapping->obj );
306 fputc( '\n', stderr );
309 static int mapping_get_fd( struct object *obj )
311 struct mapping *mapping = (struct mapping *)obj;
312 assert( obj->ops == &mapping_ops );
313 return get_mmap_fd( mapping->file );
316 static int mapping_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags )
318 struct mapping *mapping = (struct mapping *)obj;
319 struct object *file = (struct object *)mapping->file;
321 assert( obj->ops == &mapping_ops );
323 return file->ops->get_file_info( file, reply, flags );
326 static void mapping_destroy( struct object *obj )
328 struct mapping *mapping = (struct mapping *)obj;
329 assert( obj->ops == &mapping_ops );
330 if (mapping->file) release_object( mapping->file );
331 if (mapping->shared_file)
333 release_object( mapping->shared_file );
334 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
335 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
336 else shared_first = mapping->shared_next;
340 int get_page_size(void)
342 if (!page_mask) init_page_size();
343 return page_mask + 1;
346 /* create a file mapping */
347 DECL_HANDLER(create_mapping)
352 if ((obj = create_mapping( req->size_high, req->size_low,
353 req->protect, req->file_handle,
354 get_req_data(), get_req_data_size() )))
356 int access = FILE_MAP_ALL_ACCESS;
357 if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
358 reply->handle = alloc_handle( current->process, obj, access, req->inherit );
359 release_object( obj );
363 /* open a handle to a mapping */
364 DECL_HANDLER(open_mapping)
366 reply->handle = open_object( get_req_data(), get_req_data_size(),
367 &mapping_ops, req->access, req->inherit );
370 /* get a mapping information */
371 DECL_HANDLER(get_mapping_info)
373 struct mapping *mapping;
375 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
378 reply->size_high = mapping->size_high;
379 reply->size_low = mapping->size_low;
380 reply->protect = mapping->protect;
381 reply->header_size = mapping->header_size;
382 reply->base = mapping->base;
383 reply->shared_file = 0;
384 reply->shared_size = mapping->shared_size;
385 reply->drive_type = get_file_drive_type( mapping->file );
386 if (mapping->shared_file)
387 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
388 GENERIC_READ|GENERIC_WRITE, 0 );
389 release_object( mapping );