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"
39 struct object obj; /* object header */
40 int size_high; /* mapping size */
41 int size_low; /* 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 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 default_get_fd, /* get_fd */
64 mapping_destroy /* destroy */
67 static struct mapping *shared_first;
71 /* These are always the same on an i386, and it will be faster this way */
72 # define page_mask 0xfff
73 # define page_shift 12
74 # define init_page_size() do { /* nothing */ } while(0)
78 static int page_shift, page_mask;
80 static void init_page_size(void)
83 # ifdef HAVE_GETPAGESIZE
84 page_size = getpagesize();
87 page_size = sysconf(_SC_PAGESIZE);
89 # error Cannot get the page size on this platform
92 page_mask = page_size - 1;
93 /* Make sure we have a power of 2 */
94 assert( !(page_size & page_mask) );
96 while ((1 << page_shift) != page_size) page_shift++;
100 #define ROUND_ADDR(addr) \
101 ((int)(addr) & ~page_mask)
103 #define ROUND_SIZE(addr,size) \
104 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
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 ))) return 0;
147 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
148 if ((shared_fd = get_file_unix_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 release_object( mapping->shared_file );
177 mapping->shared_file = NULL;
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;
189 int unix_fd, filepos, size;
191 /* load the headers */
193 if (!(fd = get_obj_fd( (struct object *)mapping->file ))) return 0;
194 mapping->obj.fd_obj = fd;
195 unix_fd = get_unix_fd( fd );
196 filepos = lseek( unix_fd, 0, SEEK_SET );
197 if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
198 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
199 if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
201 if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
202 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
203 if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
204 /* zero out Optional header in the case it's not present or partial */
205 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
206 if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
208 /* load the section headers */
210 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
211 if (!(sec = malloc( size ))) goto error;
212 if (read( unix_fd, sec, size ) != size) goto error;
214 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
216 if (mapping->shared_file) /* link it in the list */
218 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
219 mapping->shared_prev = NULL;
220 shared_first = mapping;
223 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
224 mapping->size_high = 0;
225 mapping->base = (void *)nt.OptionalHeader.ImageBase;
226 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
227 mapping->protect = VPROT_IMAGE;
230 if (mapping->header_size > mapping->size_low) goto error;
232 lseek( unix_fd, filepos, SEEK_SET );
237 lseek( unix_fd, filepos, SEEK_SET );
238 if (sec) free( sec );
239 set_error( STATUS_INVALID_FILE_FOR_SECTION );
243 /* get the size of the unix file associated with the mapping */
244 inline static int get_file_size( struct mapping *mapping, int *size_high, int *size_low )
247 int unix_fd = get_unix_fd( mapping->obj.fd_obj );
249 if (fstat( unix_fd, &st ) == -1) return 0;
250 *size_high = st.st_size >> 32;
251 *size_low = st.st_size & 0xffffffff;
255 static struct object *create_mapping( int size_high, int size_low, int protect,
256 obj_handle_t handle, const WCHAR *name, size_t len )
258 struct mapping *mapping;
261 if (!page_mask) init_page_size();
263 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
265 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
266 return &mapping->obj; /* Nothing else to do */
268 mapping->header_size = 0;
269 mapping->base = NULL;
270 mapping->shared_file = NULL;
271 mapping->shared_size = 0;
273 if (protect & VPROT_READ) access |= GENERIC_READ;
274 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
278 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
279 if (protect & VPROT_IMAGE)
281 if (!get_image_params( mapping )) goto error;
282 return &mapping->obj;
284 if (!size_high && !size_low)
286 if (!get_file_size( mapping, &size_high, &size_low )) goto error;
290 if (!grow_file( mapping->file, size_high, size_low )) goto error;
293 else /* Anonymous mapping (no associated file) */
295 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
297 set_error( STATUS_INVALID_PARAMETER );
298 mapping->file = NULL;
301 if (!(mapping->file = create_temp_file( access ))) goto error;
302 if (!grow_file( mapping->file, size_high, size_low )) goto error;
304 mapping->obj.fd_obj = get_obj_fd( (struct object *)mapping->file );
305 mapping->size_high = size_high;
306 mapping->size_low = ROUND_SIZE( 0, size_low );
307 mapping->protect = protect;
308 return &mapping->obj;
311 release_object( mapping );
315 static void mapping_dump( struct object *obj, int verbose )
317 struct mapping *mapping = (struct mapping *)obj;
318 assert( obj->ops == &mapping_ops );
319 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
320 "shared_file=%p shared_size=%08x ",
321 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
322 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
323 dump_object_name( &mapping->obj );
324 fputc( '\n', stderr );
327 static void mapping_destroy( struct object *obj )
329 struct mapping *mapping = (struct mapping *)obj;
330 assert( obj->ops == &mapping_ops );
331 if (mapping->file) release_object( mapping->file );
332 if (mapping->shared_file)
334 release_object( mapping->shared_file );
335 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
336 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
337 else shared_first = mapping->shared_next;
341 int get_page_size(void)
343 if (!page_mask) init_page_size();
344 return page_mask + 1;
347 /* create a file mapping */
348 DECL_HANDLER(create_mapping)
353 if ((obj = create_mapping( req->size_high, req->size_low,
354 req->protect, req->file_handle,
355 get_req_data(), get_req_data_size() )))
357 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
358 release_object( obj );
362 /* open a handle to a mapping */
363 DECL_HANDLER(open_mapping)
365 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
366 &mapping_ops, req->access, req->inherit );
369 /* get a mapping information */
370 DECL_HANDLER(get_mapping_info)
372 struct mapping *mapping;
374 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
377 reply->size_high = mapping->size_high;
378 reply->size_low = mapping->size_low;
379 reply->protect = mapping->protect;
380 reply->header_size = mapping->header_size;
381 reply->base = mapping->base;
382 reply->shared_file = 0;
383 reply->shared_size = mapping->shared_size;
384 reply->drive_type = get_file_drive_type( mapping->file );
385 if (mapping->shared_file)
386 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
387 GENERIC_READ|GENERIC_WRITE, 0 );
388 release_object( mapping );