DIB Engine: Implement Polygon
[wine/hacks.git] / server / mapping.c
blob10560d3fef573a53cfe28becfa8ba4e877729a1a
1 /*
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 #include "config.h"
22 #include "wine/port.h"
24 #include <assert.h>
25 #include <stdarg.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <sys/stat.h>
29 #include <unistd.h>
31 #include "ntstatus.h"
32 #define WIN32_NO_STATUS
33 #include "windef.h"
34 #include "winternl.h"
36 #include "file.h"
37 #include "handle.h"
38 #include "thread.h"
39 #include "request.h"
40 #include "security.h"
42 /* list of memory ranges, used to store committed info */
43 struct ranges
45 unsigned int count;
46 unsigned int max;
47 struct range
49 file_pos_t start;
50 file_pos_t end;
51 } ranges[1];
54 struct mapping
56 struct object obj; /* object header */
57 mem_size_t size; /* mapping size */
58 int protect; /* protection flags */
59 struct fd *fd; /* fd for mapped file */
60 int header_size; /* size of headers (for PE image mapping) */
61 client_ptr_t base; /* default base addr (for PE image mapping) */
62 struct ranges *committed; /* list of committed ranges in this mapping */
63 struct file *shared_file; /* temp file for shared PE mapping */
64 struct list shared_entry; /* entry in global shared PE mappings list */
67 static void mapping_dump( struct object *obj, int verbose );
68 static struct object_type *mapping_get_type( struct object *obj );
69 static struct fd *mapping_get_fd( struct object *obj );
70 static unsigned int mapping_map_access( struct object *obj, unsigned int access );
71 static void mapping_destroy( struct object *obj );
72 static enum server_fd_type mapping_get_fd_type( struct fd *fd );
74 static const struct object_ops mapping_ops =
76 sizeof(struct mapping), /* size */
77 mapping_dump, /* dump */
78 mapping_get_type, /* get_type */
79 no_add_queue, /* add_queue */
80 NULL, /* remove_queue */
81 NULL, /* signaled */
82 NULL, /* satisfied */
83 no_signal, /* signal */
84 mapping_get_fd, /* get_fd */
85 mapping_map_access, /* map_access */
86 default_get_sd, /* get_sd */
87 default_set_sd, /* set_sd */
88 no_lookup_name, /* lookup_name */
89 no_open_file, /* open_file */
90 fd_close_handle, /* close_handle */
91 mapping_destroy /* destroy */
94 static const struct fd_ops mapping_fd_ops =
96 default_fd_get_poll_events, /* get_poll_events */
97 default_poll_event, /* poll_event */
98 no_flush, /* flush */
99 mapping_get_fd_type, /* get_fd_type */
100 default_fd_removable, /* removable */
101 no_fd_ioctl, /* ioctl */
102 no_fd_queue_async, /* queue_async */
103 default_fd_async_event, /* async_event */
104 default_fd_async_terminated, /* async_terminated */
105 default_fd_cancel_async /* cancel_async */
108 static struct list shared_list = LIST_INIT(shared_list);
110 #ifdef __i386__
112 /* These are always the same on an i386, and it will be faster this way */
113 # define page_mask 0xfff
114 # define page_shift 12
115 # define init_page_size() do { /* nothing */ } while(0)
117 #else /* __i386__ */
119 static int page_shift, page_mask;
121 static void init_page_size(void)
123 int page_size;
124 # ifdef HAVE_GETPAGESIZE
125 page_size = getpagesize();
126 # else
127 # ifdef __svr4__
128 page_size = sysconf(_SC_PAGESIZE);
129 # else
130 # error Cannot get the page size on this platform
131 # endif
132 # endif
133 page_mask = page_size - 1;
134 /* Make sure we have a power of 2 */
135 assert( !(page_size & page_mask) );
136 page_shift = 0;
137 while ((1 << page_shift) != page_size) page_shift++;
139 #endif /* __i386__ */
141 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
144 /* extend a file beyond the current end of file */
145 static int grow_file( int unix_fd, file_pos_t new_size )
147 static const char zero;
148 off_t size = new_size;
150 if (sizeof(new_size) > sizeof(size) && size != new_size)
152 set_error( STATUS_INVALID_PARAMETER );
153 return 0;
155 /* extend the file one byte beyond the requested size and then truncate it */
156 /* this should work around ftruncate implementations that can't extend files */
157 if (pwrite( unix_fd, &zero, 1, size ) != -1)
159 ftruncate( unix_fd, size );
160 return 1;
162 file_set_error();
163 return 0;
166 /* create a temp file for anonymous mappings */
167 static int create_temp_file( file_pos_t size )
169 char tmpfn[16];
170 int fd;
172 sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */
173 fd = mkstemps( tmpfn, 0 );
174 if (fd != -1)
176 if (!grow_file( fd, size ))
178 close( fd );
179 fd = -1;
181 unlink( tmpfn );
183 else file_set_error();
184 return fd;
187 /* find the shared PE mapping for a given mapping */
188 static struct file *get_shared_file( struct mapping *mapping )
190 struct mapping *ptr;
192 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
193 if (is_same_file_fd( ptr->fd, mapping->fd ))
194 return (struct file *)grab_object( ptr->shared_file );
195 return NULL;
198 /* return the size of the memory mapping and file range of a given section */
199 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
200 off_t *file_start, size_t *file_size )
202 static const unsigned int sector_align = 0x1ff;
204 if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
205 else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
207 *file_start = sec->PointerToRawData & ~sector_align;
208 *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
209 if (*file_size > *map_size) *file_size = *map_size;
212 /* add a range to the committed list */
213 static void add_committed_range( struct mapping *mapping, file_pos_t start, file_pos_t end )
215 unsigned int i, j;
216 struct range *ranges;
218 if (!mapping->committed) return; /* everything committed already */
220 for (i = 0, ranges = mapping->committed->ranges; i < mapping->committed->count; i++)
222 if (ranges[i].start > end) break;
223 if (ranges[i].end < start) continue;
224 if (ranges[i].start > start) ranges[i].start = start; /* extend downwards */
225 if (ranges[i].end < end) /* extend upwards and maybe merge with next */
227 for (j = i + 1; j < mapping->committed->count; j++)
229 if (ranges[j].start > end) break;
230 if (ranges[j].end > end) end = ranges[j].end;
232 if (j > i + 1)
234 memmove( &ranges[i + 1], &ranges[j], (mapping->committed->count - j) * sizeof(*ranges) );
235 mapping->committed->count -= j - (i + 1);
237 ranges[i].end = end;
239 return;
242 /* now add a new range */
244 if (mapping->committed->count == mapping->committed->max)
246 unsigned int new_size = mapping->committed->max * 2;
247 struct ranges *new_ptr = realloc( mapping->committed, offsetof( struct ranges, ranges[new_size] ));
248 if (!new_ptr) return;
249 new_ptr->max = new_size;
250 ranges = new_ptr->ranges;
251 mapping->committed = new_ptr;
253 memmove( &ranges[i + 1], &ranges[i], (mapping->committed->count - i) * sizeof(*ranges) );
254 ranges[i].start = start;
255 ranges[i].end = end;
256 mapping->committed->count++;
259 /* find the range containing start and return whether it's committed */
260 static int find_committed_range( struct mapping *mapping, file_pos_t start, mem_size_t *size )
262 unsigned int i;
263 struct range *ranges;
265 if (!mapping->committed) /* everything is committed */
267 *size = mapping->size - start;
268 return 1;
270 for (i = 0, ranges = mapping->committed->ranges; i < mapping->committed->count; i++)
272 if (ranges[i].start > start)
274 *size = ranges[i].start - start;
275 return 0;
277 if (ranges[i].end > start)
279 *size = ranges[i].end - start;
280 return 1;
283 *size = mapping->size - start;
284 return 0;
287 /* allocate and fill the temp file for a shared PE image mapping */
288 static int build_shared_mapping( struct mapping *mapping, int fd,
289 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
291 unsigned int i;
292 mem_size_t total_size;
293 size_t file_size, map_size, max_size;
294 off_t shared_pos, read_pos, write_pos;
295 char *buffer = NULL;
296 int shared_fd;
297 long toread;
299 /* compute the total size of the shared mapping */
301 total_size = max_size = 0;
302 for (i = 0; i < nb_sec; i++)
304 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
305 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
307 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
308 if (file_size > max_size) max_size = file_size;
309 total_size += map_size;
312 if (!total_size) return 1; /* nothing to do */
314 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
316 /* create a temp file for the mapping */
318 if ((shared_fd = create_temp_file( total_size )) == -1) return 0;
319 if (!(mapping->shared_file = create_file_for_fd( shared_fd, FILE_GENERIC_READ|FILE_GENERIC_WRITE, 0 )))
320 return 0;
322 if (!(buffer = malloc( max_size ))) goto error;
324 /* copy the shared sections data into the temp file */
326 shared_pos = 0;
327 for (i = 0; i < nb_sec; i++)
329 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
330 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
331 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
332 write_pos = shared_pos;
333 shared_pos += map_size;
334 if (!sec[i].PointerToRawData || !file_size) continue;
335 toread = file_size;
336 while (toread)
338 long res = pread( fd, buffer + file_size - toread, toread, read_pos );
339 if (!res && toread < 0x200) /* partial sector at EOF is not an error */
341 file_size -= toread;
342 break;
344 if (res <= 0) goto error;
345 toread -= res;
346 read_pos += res;
348 if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
350 free( buffer );
351 return 1;
353 error:
354 release_object( mapping->shared_file );
355 mapping->shared_file = NULL;
356 free( buffer );
357 return 0;
360 /* retrieve the mapping parameters for an executable (PE) image */
361 static int get_image_params( struct mapping *mapping, int unix_fd )
363 IMAGE_DOS_HEADER dos;
364 IMAGE_SECTION_HEADER *sec = NULL;
365 struct
367 DWORD Signature;
368 IMAGE_FILE_HEADER FileHeader;
369 union
371 IMAGE_OPTIONAL_HEADER32 hdr32;
372 IMAGE_OPTIONAL_HEADER64 hdr64;
373 } opt;
374 } nt;
375 off_t pos;
376 int size;
378 /* load the headers */
380 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
381 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
382 pos = dos.e_lfanew;
384 size = pread( unix_fd, &nt, sizeof(nt), pos );
385 if (size < sizeof(nt.Signature) + sizeof(nt.FileHeader)) goto error;
386 /* zero out Optional header in the case it's not present or partial */
387 if (size < sizeof(nt)) memset( (char *)&nt + size, 0, sizeof(nt) - size );
388 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
390 switch (nt.opt.hdr32.Magic)
392 case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
393 mapping->size = ROUND_SIZE( nt.opt.hdr32.SizeOfImage );
394 mapping->base = nt.opt.hdr32.ImageBase;
395 mapping->header_size = nt.opt.hdr32.SizeOfHeaders;
396 break;
397 case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
398 mapping->size = ROUND_SIZE( nt.opt.hdr64.SizeOfImage );
399 mapping->base = nt.opt.hdr64.ImageBase;
400 mapping->header_size = nt.opt.hdr64.SizeOfHeaders;
401 break;
402 default:
403 goto error;
406 /* load the section headers */
408 pos += sizeof(nt.Signature) + sizeof(nt.FileHeader) + nt.FileHeader.SizeOfOptionalHeader;
409 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
410 if (pos + size > mapping->size) goto error;
411 if (pos + size > mapping->header_size) mapping->header_size = pos + size;
412 if (!(sec = malloc( size ))) goto error;
413 if (pread( unix_fd, sec, size, pos ) != size) goto error;
415 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
417 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
419 mapping->protect = VPROT_IMAGE;
420 free( sec );
421 return 1;
423 error:
424 free( sec );
425 set_error( STATUS_INVALID_FILE_FOR_SECTION );
426 return 0;
429 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
430 unsigned int attr, mem_size_t size, int protect,
431 obj_handle_t handle, const struct security_descriptor *sd )
433 struct mapping *mapping;
434 struct file *file;
435 struct fd *fd;
436 int access = 0;
437 int unix_fd;
438 struct stat st;
440 if (!page_mask) init_page_size();
442 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
443 return NULL;
444 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
445 return &mapping->obj; /* Nothing else to do */
447 if (sd) default_set_sd( &mapping->obj, sd, OWNER_SECURITY_INFORMATION|
448 GROUP_SECURITY_INFORMATION|
449 DACL_SECURITY_INFORMATION|
450 SACL_SECURITY_INFORMATION );
451 mapping->header_size = 0;
452 mapping->base = 0;
453 mapping->fd = NULL;
454 mapping->shared_file = NULL;
455 mapping->committed = NULL;
457 if (protect & VPROT_READ) access |= FILE_READ_DATA;
458 if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
460 if (handle)
462 unsigned int mapping_access = FILE_MAPPING_ACCESS;
464 if (!(protect & VPROT_COMMITTED))
466 set_error( STATUS_INVALID_PARAMETER );
467 goto error;
469 if (!(file = get_file_obj( current->process, handle, access ))) goto error;
470 fd = get_obj_fd( (struct object *)file );
472 /* file sharing rules for mappings are different so we use magic the access rights */
473 if (protect & VPROT_IMAGE) mapping_access |= FILE_MAPPING_IMAGE;
474 else if (protect & VPROT_WRITE) mapping_access |= FILE_MAPPING_WRITE;
475 mapping->fd = dup_fd_object( fd, mapping_access,
476 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
477 FILE_SYNCHRONOUS_IO_NONALERT );
478 release_object( file );
479 release_object( fd );
480 if (!mapping->fd) goto error;
482 set_fd_user( mapping->fd, &mapping_fd_ops, &mapping->obj );
483 if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
484 if (protect & VPROT_IMAGE)
486 if (!get_image_params( mapping, unix_fd )) goto error;
487 return &mapping->obj;
489 if (fstat( unix_fd, &st ) == -1)
491 file_set_error();
492 goto error;
494 if (!size)
496 if (!(size = st.st_size))
498 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
499 goto error;
502 else if (st.st_size < size && !grow_file( unix_fd, size )) goto error;
504 else /* Anonymous mapping (no associated file) */
506 if (!size || (protect & VPROT_IMAGE))
508 set_error( STATUS_INVALID_PARAMETER );
509 goto error;
511 if (!(protect & VPROT_COMMITTED))
513 if (!(mapping->committed = mem_alloc( offsetof(struct ranges, ranges[8]) ))) goto error;
514 mapping->committed->count = 0;
515 mapping->committed->max = 8;
517 if ((unix_fd = create_temp_file( size )) == -1) goto error;
518 if (!(mapping->fd = create_anonymous_fd( &mapping_fd_ops, unix_fd, &mapping->obj,
519 FILE_SYNCHRONOUS_IO_NONALERT ))) goto error;
521 mapping->size = (size + page_mask) & ~((mem_size_t)page_mask);
522 mapping->protect = protect;
523 return &mapping->obj;
525 error:
526 release_object( mapping );
527 return NULL;
530 static void mapping_dump( struct object *obj, int verbose )
532 struct mapping *mapping = (struct mapping *)obj;
533 assert( obj->ops == &mapping_ops );
534 fprintf( stderr, "Mapping size=%08x%08x prot=%08x fd=%p header_size=%08x base=%08lx "
535 "shared_file=%p ",
536 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
537 mapping->protect, mapping->fd, mapping->header_size,
538 (unsigned long)mapping->base, mapping->shared_file );
539 dump_object_name( &mapping->obj );
540 fputc( '\n', stderr );
543 static struct object_type *mapping_get_type( struct object *obj )
545 static const WCHAR name[] = {'S','e','c','t','i','o','n'};
546 static const struct unicode_str str = { name, sizeof(name) };
547 return get_object_type( &str );
550 static struct fd *mapping_get_fd( struct object *obj )
552 struct mapping *mapping = (struct mapping *)obj;
553 return (struct fd *)grab_object( mapping->fd );
556 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
558 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
559 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
560 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
561 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
562 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
565 static void mapping_destroy( struct object *obj )
567 struct mapping *mapping = (struct mapping *)obj;
568 assert( obj->ops == &mapping_ops );
569 if (mapping->fd) release_object( mapping->fd );
570 if (mapping->shared_file)
572 release_object( mapping->shared_file );
573 list_remove( &mapping->shared_entry );
575 free( mapping->committed );
578 static enum server_fd_type mapping_get_fd_type( struct fd *fd )
580 return FD_TYPE_FILE;
583 int get_page_size(void)
585 if (!page_mask) init_page_size();
586 return page_mask + 1;
589 /* create a file mapping */
590 DECL_HANDLER(create_mapping)
592 struct object *obj;
593 struct unicode_str name;
594 struct directory *root = NULL;
595 const struct object_attributes *objattr = get_req_data();
596 const struct security_descriptor *sd;
598 reply->handle = 0;
600 if (!objattr_is_valid( objattr, get_req_data_size() ))
601 return;
603 sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
604 objattr_get_name( objattr, &name );
606 if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
607 return;
609 if ((obj = create_mapping( root, &name, req->attributes, req->size, req->protect, req->file_handle, sd )))
611 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
612 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
613 else
614 reply->handle = alloc_handle_no_access_check( current->process, obj, req->access, req->attributes );
615 release_object( obj );
618 if (root) release_object( root );
621 /* open a handle to a mapping */
622 DECL_HANDLER(open_mapping)
624 struct unicode_str name;
625 struct directory *root = NULL;
626 struct mapping *mapping;
628 get_req_unicode_str( &name );
629 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
630 return;
632 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
634 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
635 release_object( mapping );
638 if (root) release_object( root );
641 /* get a mapping information */
642 DECL_HANDLER(get_mapping_info)
644 struct mapping *mapping;
645 struct fd *fd;
647 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
648 req->access, &mapping_ops )))
650 reply->size = mapping->size;
651 reply->protect = mapping->protect;
652 reply->header_size = mapping->header_size;
653 reply->base = mapping->base;
654 reply->shared_file = 0;
655 if ((fd = get_obj_fd( &mapping->obj )))
657 if (!is_fd_removable(fd))
658 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
659 release_object( fd );
661 if (mapping->shared_file)
663 if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
664 GENERIC_READ|GENERIC_WRITE, 0 )))
666 if (reply->mapping) close_handle( current->process, reply->mapping );
669 release_object( mapping );
673 /* get a range of committed pages in a file mapping */
674 DECL_HANDLER(get_mapping_committed_range)
676 struct mapping *mapping;
678 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, 0, &mapping_ops )))
680 if (!(req->offset & page_mask) && req->offset < mapping->size)
681 reply->committed = find_committed_range( mapping, req->offset, &reply->size );
682 else
683 set_error( STATUS_INVALID_PARAMETER );
685 release_object( mapping );
689 /* add a range to the committed pages in a file mapping */
690 DECL_HANDLER(add_mapping_committed_range)
692 struct mapping *mapping;
694 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, 0, &mapping_ops )))
696 if (!(req->size & page_mask) &&
697 !(req->offset & page_mask) &&
698 req->offset < mapping->size &&
699 req->size > 0 &&
700 req->size <= mapping->size - req->offset)
701 add_committed_range( mapping, req->offset, req->offset + req->size );
702 else
703 set_error( STATUS_INVALID_PARAMETER );
705 release_object( mapping );