Use poll() on the client-side during server waits to implement
[wine.git] / server / mapping.c
blob2bfdd7716433a6e992d3ab2347eb8b75bb6874eb
1 /*
2 * Server-side file mapping management
4 * Copyright (C) 1999 Alexandre Julliard
5 */
7 #include <assert.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <unistd.h>
12 #include "config.h"
13 #include "winnt.h"
14 #include "winbase.h"
16 #include "handle.h"
17 #include "thread.h"
18 #include "request.h"
20 struct mapping
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 */
33 static int mapping_get_fd( struct object *obj );
34 static void mapping_dump( struct object *obj, int verbose );
35 static void mapping_destroy( struct object *obj );
37 static const struct object_ops mapping_ops =
39 sizeof(struct mapping), /* size */
40 mapping_dump, /* dump */
41 no_add_queue, /* add_queue */
42 NULL, /* remove_queue */
43 NULL, /* signaled */
44 NULL, /* satisfied */
45 NULL, /* get_poll_events */
46 NULL, /* poll_event */
47 mapping_get_fd, /* get_fd */
48 no_flush, /* flush */
49 no_get_file_info, /* get_file_info */
50 mapping_destroy /* destroy */
53 #ifdef __i386__
55 /* These are always the same on an i386, and it will be faster this way */
56 # define page_mask 0xfff
57 # define page_shift 12
58 # define init_page_size() do { /* nothing */ } while(0)
60 #else /* __i386__ */
62 static int page_shift, page_mask;
64 static void init_page_size(void)
66 int page_size;
67 # ifdef HAVE_GETPAGESIZE
68 page_size = getpagesize();
69 # else
70 # ifdef __svr4__
71 page_size = sysconf(_SC_PAGESIZE);
72 # else
73 # error Cannot get the page size on this platform
74 # endif
75 # endif
76 page_mask = page_size - 1;
77 /* Make sure we have a power of 2 */
78 assert( !(page_size & page_mask) );
79 page_shift = 0;
80 while ((1 << page_shift) != page_size) page_shift++;
82 #endif /* __i386__ */
84 #define ROUND_ADDR(addr) \
85 ((int)(addr) & ~page_mask)
87 #define ROUND_SIZE(addr,size) \
88 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
90 /* get the fd to use for mmaping a file */
91 inline static int get_mmap_fd( struct file *file )
93 struct object *obj;
94 if (!(obj = (struct object *)file))
96 set_error( STATUS_INVALID_HANDLE );
97 return -1;
99 return obj->ops->get_fd( obj );
102 /* allocate and fill the temp file for a shared PE image mapping */
103 static int build_shared_mapping( struct mapping *mapping, int fd,
104 IMAGE_SECTION_HEADER *sec, int nb_sec )
106 int i, max_size, total_size, pos;
107 char *buffer = NULL;
108 int shared_fd;
109 long toread;
111 /* compute the total size of the shared mapping */
113 total_size = max_size = 0;
114 for (i = 0; i < nb_sec; i++)
116 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
117 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
119 int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
120 if (size > max_size) max_size = size;
121 total_size += size;
124 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
126 /* create a temp file for the mapping */
128 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) goto error;
129 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
130 if ((shared_fd = get_mmap_fd( mapping->shared_file )) == -1) goto error;
132 if (!(buffer = malloc( max_size ))) goto error;
134 /* copy the shared sections data into the temp file */
136 for (i = pos = 0; i < nb_sec; i++)
138 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
139 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
140 if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
141 pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
142 if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
143 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
144 if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
145 toread = sec[i].SizeOfRawData;
146 while (toread)
148 long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
149 if (res <= 0) goto error;
150 toread -= res;
152 if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
154 free( buffer );
155 return 1;
157 error:
158 if (buffer) free( buffer );
159 return 0;
162 /* retrieve the mapping parameters for an executable (PE) image */
163 static int get_image_params( struct mapping *mapping )
165 IMAGE_DOS_HEADER dos;
166 IMAGE_NT_HEADERS nt;
167 IMAGE_SECTION_HEADER *sec = NULL;
168 int fd, filepos, size;
170 /* load the headers */
172 if ((fd = get_mmap_fd( mapping->file )) == -1) return 0;
173 filepos = lseek( fd, 0, SEEK_SET );
174 if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
175 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
176 if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
177 if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
178 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
180 /* load the section headers */
182 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
183 if (!(sec = malloc( size ))) goto error;
184 if (read( fd, sec, size ) != size) goto error;
186 if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
188 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
189 mapping->size_high = 0;
190 mapping->base = (void *)nt.OptionalHeader.ImageBase;
191 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
192 mapping->protect = VPROT_IMAGE;
194 /* sanity check */
195 if (mapping->header_size > mapping->size_low) goto error;
197 lseek( fd, filepos, SEEK_SET );
198 free( sec );
199 return 1;
201 error:
202 lseek( fd, filepos, SEEK_SET );
203 if (sec) free( sec );
204 set_error( STATUS_INVALID_FILE_FOR_SECTION );
205 return 0;
209 static struct object *create_mapping( int size_high, int size_low, int protect,
210 handle_t handle, const WCHAR *name, size_t len )
212 struct mapping *mapping;
213 int access = 0;
215 if (!page_mask) init_page_size();
217 if (!(mapping = create_named_object( &mapping_ops, name, len )))
218 return NULL;
219 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
220 return &mapping->obj; /* Nothing else to do */
222 mapping->header_size = 0;
223 mapping->base = NULL;
224 mapping->shared_file = NULL;
225 mapping->shared_size = 0;
227 if (protect & VPROT_READ) access |= GENERIC_READ;
228 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
230 if (handle)
232 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
233 if (protect & VPROT_IMAGE)
235 if (!get_image_params( mapping )) goto error;
236 return &mapping->obj;
238 if (!size_high && !size_low)
240 struct get_file_info_request req;
241 struct object *obj = (struct object *)mapping->file;
242 obj->ops->get_file_info( obj, &req );
243 size_high = req.size_high;
244 size_low = ROUND_SIZE( 0, req.size_low );
246 else if (!grow_file( mapping->file, size_high, size_low )) goto error;
248 else /* Anonymous mapping (no associated file) */
250 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
252 set_error( STATUS_INVALID_PARAMETER );
253 mapping->file = NULL;
254 goto error;
256 if (!(mapping->file = create_temp_file( access ))) goto error;
257 if (!grow_file( mapping->file, size_high, size_low )) goto error;
259 mapping->size_high = size_high;
260 mapping->size_low = ROUND_SIZE( 0, size_low );
261 mapping->protect = protect;
262 return &mapping->obj;
264 error:
265 release_object( mapping );
266 return NULL;
269 static void mapping_dump( struct object *obj, int verbose )
271 struct mapping *mapping = (struct mapping *)obj;
272 assert( obj->ops == &mapping_ops );
273 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
274 "shared_file=%p shared_size=%08x ",
275 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
276 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
277 dump_object_name( &mapping->obj );
278 fputc( '\n', stderr );
281 static int mapping_get_fd( struct object *obj )
283 struct mapping *mapping = (struct mapping *)obj;
284 assert( obj->ops == &mapping_ops );
285 return get_mmap_fd( mapping->file );
288 static void mapping_destroy( struct object *obj )
290 struct mapping *mapping = (struct mapping *)obj;
291 assert( obj->ops == &mapping_ops );
292 if (mapping->file) release_object( mapping->file );
293 if (mapping->shared_file) release_object( mapping->shared_file );
296 int get_page_size(void)
298 if (!page_mask) init_page_size();
299 return page_mask + 1;
302 /* create a file mapping */
303 DECL_HANDLER(create_mapping)
305 struct object *obj;
307 req->handle = 0;
308 if ((obj = create_mapping( req->size_high, req->size_low,
309 req->protect, req->file_handle,
310 get_req_data(req), get_req_data_size(req) )))
312 int access = FILE_MAP_ALL_ACCESS;
313 if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
314 req->handle = alloc_handle( current->process, obj, access, req->inherit );
315 release_object( obj );
319 /* open a handle to a mapping */
320 DECL_HANDLER(open_mapping)
322 req->handle = open_object( get_req_data(req), get_req_data_size(req),
323 &mapping_ops, req->access, req->inherit );
326 /* get a mapping information */
327 DECL_HANDLER(get_mapping_info)
329 struct mapping *mapping;
331 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
332 0, &mapping_ops )))
334 req->size_high = mapping->size_high;
335 req->size_low = mapping->size_low;
336 req->protect = mapping->protect;
337 req->header_size = mapping->header_size;
338 req->base = mapping->base;
339 req->shared_file = 0;
340 req->shared_size = mapping->shared_size;
341 if (mapping->shared_file)
342 req->shared_file = alloc_handle( current->process, mapping->shared_file,
343 GENERIC_READ|GENERIC_WRITE, 0 );
344 release_object( mapping );