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 mapping *shared_next; /* next in shared PE mapping list */
49 struct mapping *shared_prev; /* prev in shared PE mapping list */
52 static void mapping_dump( struct object *obj, int verbose );
53 static struct fd *mapping_get_fd( struct object *obj );
54 static void mapping_destroy( struct object *obj );
56 static const struct object_ops mapping_ops =
58 sizeof(struct mapping), /* size */
59 mapping_dump, /* dump */
60 no_add_queue, /* add_queue */
61 NULL, /* remove_queue */
64 no_signal, /* signal */
65 mapping_get_fd, /* get_fd */
66 no_close_handle, /* close_handle */
67 mapping_destroy /* destroy */
70 static struct mapping *shared_first;
74 /* These are always the same on an i386, and it will be faster this way */
75 # define page_mask 0xfff
76 # define page_shift 12
77 # define init_page_size() do { /* nothing */ } while(0)
81 static int page_shift, page_mask;
83 static void init_page_size(void)
86 # ifdef HAVE_GETPAGESIZE
87 page_size = getpagesize();
90 page_size = sysconf(_SC_PAGESIZE);
92 # error Cannot get the page size on this platform
95 page_mask = page_size - 1;
96 /* Make sure we have a power of 2 */
97 assert( !(page_size & page_mask) );
99 while ((1 << page_shift) != page_size) page_shift++;
101 #endif /* __i386__ */
103 #define ROUND_SIZE_MASK(addr,size,mask) \
104 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
106 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
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, unsigned int nb_sec )
124 unsigned int i, max_size, total_size;
125 off_t shared_pos, read_pos, write_pos;
130 /* compute the total size of the shared mapping */
132 total_size = max_size = 0;
133 for (i = 0; i < nb_sec; i++)
135 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
136 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
138 unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
139 if (size > max_size) max_size = size;
143 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
145 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
147 /* create a temp file for the mapping */
149 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
150 if (!grow_file( mapping->shared_file, total_size )) goto error;
151 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
153 if (!(buffer = malloc( max_size ))) goto error;
155 /* copy the shared sections data into the temp file */
158 for (i = 0; i < nb_sec; i++)
160 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
161 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
162 write_pos = shared_pos;
163 shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
164 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
165 read_pos = sec[i].PointerToRawData;
166 toread = sec[i].SizeOfRawData;
169 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
170 if (res <= 0) goto error;
174 if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
181 release_object( mapping->shared_file );
182 mapping->shared_file = NULL;
183 if (buffer) free( buffer );
187 /* retrieve the mapping parameters for an executable (PE) image */
188 static int get_image_params( struct mapping *mapping )
190 IMAGE_DOS_HEADER dos;
192 IMAGE_SECTION_HEADER *sec = NULL;
197 /* load the headers */
199 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
200 unix_fd = get_unix_fd( fd );
201 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
202 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
205 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
207 pos += sizeof(nt.Signature);
208 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
209 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
211 pos += sizeof(nt.FileHeader);
212 /* zero out Optional header in the case it's not present or partial */
213 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
214 if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
215 pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
216 pos += nt.FileHeader.SizeOfOptionalHeader;
218 /* load the section headers */
220 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
221 if (!(sec = malloc( size ))) goto error;
222 if (pread( unix_fd, sec, size, pos ) != size) goto error;
224 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
226 if (mapping->shared_file) /* link it in the list */
228 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
229 mapping->shared_prev = NULL;
230 shared_first = mapping;
233 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
234 mapping->base = (void *)nt.OptionalHeader.ImageBase;
235 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
236 nt.OptionalHeader.SectionAlignment - 1 );
237 mapping->protect = VPROT_IMAGE;
240 if (mapping->header_size > mapping->size) goto error;
243 release_object( fd );
247 if (sec) free( sec );
248 release_object( fd );
249 set_error( STATUS_INVALID_FILE_FOR_SECTION );
253 /* get the size of the unix file associated with the mapping */
254 inline static int get_file_size( struct file *file, file_pos_t *size )
257 int unix_fd = get_file_unix_fd( file );
259 if (fstat( unix_fd, &st ) == -1) return 0;
264 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
265 const WCHAR *name, size_t len )
267 struct mapping *mapping;
270 if (!page_mask) init_page_size();
272 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
274 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
275 return &mapping->obj; /* Nothing else to do */
277 mapping->header_size = 0;
278 mapping->base = NULL;
279 mapping->shared_file = NULL;
280 mapping->shared_size = 0;
282 if (protect & VPROT_READ) access |= GENERIC_READ;
283 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
287 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
288 if (protect & VPROT_IMAGE)
290 if (!get_image_params( mapping )) goto error;
291 return &mapping->obj;
295 if (!get_file_size( mapping->file, &size )) goto error;
298 set_error( STATUS_FILE_INVALID );
304 if (!grow_file( mapping->file, size )) goto error;
307 else /* Anonymous mapping (no associated file) */
309 if (!size || (protect & VPROT_IMAGE))
311 set_error( STATUS_INVALID_PARAMETER );
312 mapping->file = NULL;
315 if (!(mapping->file = create_temp_file( access ))) goto error;
316 if (!grow_file( mapping->file, size )) goto error;
318 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
319 mapping->protect = protect;
320 return &mapping->obj;
323 release_object( mapping );
327 static void mapping_dump( struct object *obj, int verbose )
329 struct mapping *mapping = (struct mapping *)obj;
330 assert( obj->ops == &mapping_ops );
331 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
332 "shared_file=%p shared_size=%08x ",
333 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
334 mapping->protect, mapping->file, mapping->header_size,
335 mapping->base, mapping->shared_file, mapping->shared_size );
336 dump_object_name( &mapping->obj );
337 fputc( '\n', stderr );
340 static struct fd *mapping_get_fd( struct object *obj )
342 struct mapping *mapping = (struct mapping *)obj;
343 return get_obj_fd( (struct object *)mapping->file );
346 static void mapping_destroy( struct object *obj )
348 struct mapping *mapping = (struct mapping *)obj;
349 assert( obj->ops == &mapping_ops );
350 if (mapping->file) release_object( mapping->file );
351 if (mapping->shared_file)
353 release_object( mapping->shared_file );
354 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
355 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
356 else shared_first = mapping->shared_next;
360 int get_page_size(void)
362 if (!page_mask) init_page_size();
363 return page_mask + 1;
366 /* create a file mapping */
367 DECL_HANDLER(create_mapping)
370 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
373 if ((obj = create_mapping( size, req->protect, req->file_handle,
374 get_req_data(), get_req_data_size() )))
376 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
377 release_object( obj );
381 /* open a handle to a mapping */
382 DECL_HANDLER(open_mapping)
384 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
385 &mapping_ops, req->access, req->inherit );
388 /* get a mapping information */
389 DECL_HANDLER(get_mapping_info)
391 struct mapping *mapping;
393 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
396 reply->size_high = (unsigned int)(mapping->size >> 32);
397 reply->size_low = (unsigned int)mapping->size;
398 reply->protect = mapping->protect;
399 reply->header_size = mapping->header_size;
400 reply->base = mapping->base;
401 reply->shared_file = 0;
402 reply->shared_size = mapping->shared_size;
403 if (mapping->shared_file)
404 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
405 GENERIC_READ|GENERIC_WRITE, 0 );
406 release_object( mapping );