2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
13 #include <sys/errno.h>
16 #include <sys/types.h>
30 struct object obj; /* object header */
31 struct select_user select; /* select user */
32 struct file *next; /* next file in hashing list */
33 char *name; /* file name */
34 unsigned int access; /* file access (GENERIC_READ/WRITE) */
35 unsigned int flags; /* flags (FILE_FLAG_*) */
36 unsigned int sharing; /* file sharing mode */
39 #define NAME_HASH_SIZE 37
41 static struct file *file_hash[NAME_HASH_SIZE];
43 static void file_dump( struct object *obj, int verbose );
44 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry );
45 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry );
46 static int file_signaled( struct object *obj, struct thread *thread );
47 static int file_get_read_fd( struct object *obj );
48 static int file_get_write_fd( struct object *obj );
49 static int file_flush( struct object *obj );
50 static int file_get_info( struct object *obj, struct get_file_info_request *req );
51 static void file_destroy( struct object *obj );
53 static const struct object_ops file_ops =
69 static int get_name_hash( const char *name )
72 while (*name) hash ^= *name++;
73 return hash % NAME_HASH_SIZE;
76 /* check if the desired access is possible without violating */
77 /* the sharing mode of other opens of the same file */
78 static int check_sharing( const char *name, int hash, unsigned int access,
79 unsigned int sharing )
82 unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
83 unsigned int existing_access = 0;
85 for (file = file_hash[hash]; file; file = file->next)
87 if (strcmp( file->name, name )) continue;
88 existing_sharing &= file->sharing;
89 existing_access |= file->access;
91 if ((access & GENERIC_READ) && !(existing_sharing & FILE_SHARE_READ)) goto error;
92 if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) goto error;
93 if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) goto error;
94 if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) goto error;
97 set_error( ERROR_SHARING_VIOLATION );
101 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing,
105 if ((file = alloc_object( &file_ops )))
109 file->select.fd = fd;
110 file->select.func = default_select_event;
111 file->select.private = file;
112 file->access = access;
114 file->sharing = sharing;
115 register_select_user( &file->select );
121 static struct file *create_file( const char *nameptr, size_t len, unsigned int access,
122 unsigned int sharing, int create, unsigned int attrs )
130 if (!(name = mem_alloc( len + 1 ))) return NULL;
131 memcpy( name, nameptr, len );
134 /* check sharing mode */
135 hash = get_name_hash( name );
136 if (!check_sharing( name, hash, access, sharing )) goto error;
140 case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
141 case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
142 case OPEN_ALWAYS: flags = O_CREAT; break;
143 case TRUNCATE_EXISTING: flags = O_TRUNC; break;
144 case OPEN_EXISTING: flags = 0; break;
145 default: set_error( ERROR_INVALID_PARAMETER ); goto error;
147 switch(access & (GENERIC_READ | GENERIC_WRITE))
150 case GENERIC_READ: flags |= O_RDONLY; break;
151 case GENERIC_WRITE: flags |= O_WRONLY; break;
152 case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
155 /* FIXME: should set error to ERROR_ALREADY_EXISTS if file existed before */
156 if ((fd = open( name, flags | O_NONBLOCK,
157 (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
159 /* refuse to open a directory */
160 if (fstat( fd, &st ) == -1) goto file_error;
161 if (S_ISDIR(st.st_mode))
163 set_error( ERROR_ACCESS_DENIED );
167 if (!(file = create_file_for_fd( fd, access, sharing, attrs ))) goto error;
169 file->next = file_hash[hash];
170 file_hash[hash] = file;
176 if (fd != -1) close( fd );
181 /* Create an anonymous Unix file */
182 int create_anonymous_file(void)
189 if (!(name = tmpnam(NULL)))
191 set_error( ERROR_TOO_MANY_OPEN_FILES );
194 fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
195 } while ((fd == -1) && (errno == EEXIST));
205 /* Create a temp file for anonymous mappings */
206 struct file *create_temp_file( int access )
211 if ((fd = create_anonymous_file()) == -1) return NULL;
212 if (!(file = create_file_for_fd( fd, access, 0, 0 ))) close( fd );
216 static void file_dump( struct object *obj, int verbose )
218 struct file *file = (struct file *)obj;
219 assert( obj->ops == &file_ops );
220 fprintf( stderr, "File fd=%d flags=%08x name='%s'\n",
221 file->select.fd, file->flags, file->name );
224 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry )
226 struct file *file = (struct file *)obj;
227 assert( obj->ops == &file_ops );
228 if (!obj->head) /* first on the queue */
231 if (file->access & GENERIC_READ) events |= READ_EVENT;
232 if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
233 set_select_events( &file->select, events );
235 add_queue( obj, entry );
239 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry )
241 struct file *file = (struct file *)grab_object(obj);
242 assert( obj->ops == &file_ops );
244 remove_queue( obj, entry );
245 if (!obj->head) /* last on the queue is gone */
246 set_select_events( &file->select, 0 );
247 release_object( obj );
250 static int file_signaled( struct object *obj, struct thread *thread )
253 struct file *file = (struct file *)obj;
254 assert( obj->ops == &file_ops );
256 if (file->access & GENERIC_READ) events |= READ_EVENT;
257 if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
258 if (check_select_events( &file->select, events ))
260 /* stop waiting on select() if we are signaled */
261 set_select_events( &file->select, 0 );
266 /* restart waiting on select() if we are no longer signaled */
267 if (obj->head) set_select_events( &file->select, events );
272 static int file_get_read_fd( struct object *obj )
274 struct file *file = (struct file *)obj;
275 assert( obj->ops == &file_ops );
276 return dup( file->select.fd );
279 static int file_get_write_fd( struct object *obj )
281 struct file *file = (struct file *)obj;
282 assert( obj->ops == &file_ops );
283 return dup( file->select.fd );
286 static int file_flush( struct object *obj )
289 struct file *file = (struct file *)grab_object(obj);
290 assert( obj->ops == &file_ops );
292 ret = (fsync( file->select.fd ) != -1);
293 if (!ret) file_set_error();
294 release_object( file );
298 static int file_get_info( struct object *obj, struct get_file_info_request *req )
301 struct file *file = (struct file *)obj;
302 assert( obj->ops == &file_ops );
304 if (fstat( file->select.fd, &st ) == -1)
309 if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
310 S_ISSOCK(st.st_mode) || isatty(file->select.fd)) req->type = FILE_TYPE_CHAR;
311 else req->type = FILE_TYPE_DISK;
312 if (S_ISDIR(st.st_mode)) req->attr = FILE_ATTRIBUTE_DIRECTORY;
313 else req->attr = FILE_ATTRIBUTE_ARCHIVE;
314 if (!(st.st_mode & S_IWUSR)) req->attr |= FILE_ATTRIBUTE_READONLY;
315 req->access_time = st.st_atime;
316 req->write_time = st.st_mtime;
318 req->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
319 req->links = st.st_nlink;
320 req->index_high = st.st_dev;
321 req->index_low = st.st_ino;
322 req->serial = 0; /* FIXME */
326 static void file_destroy( struct object *obj )
328 struct file *file = (struct file *)obj;
329 assert( obj->ops == &file_ops );
333 /* remove it from the hashing list */
334 struct file **pptr = &file_hash[get_name_hash( file->name )];
335 while (*pptr && *pptr != file) pptr = &(*pptr)->next;
337 *pptr = (*pptr)->next;
338 if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
341 unregister_select_user( &file->select );
342 close( file->select.fd );
345 /* set the last error depending on errno */
346 void file_set_error(void)
350 case EAGAIN: set_error( ERROR_SHARING_VIOLATION ); break;
351 case EBADF: set_error( ERROR_INVALID_HANDLE ); break;
352 case ENOSPC: set_error( ERROR_HANDLE_DISK_FULL ); break;
354 case EPERM: set_error( ERROR_ACCESS_DENIED ); break;
355 case EROFS: set_error( ERROR_WRITE_PROTECT ); break;
356 case EBUSY: set_error( ERROR_LOCK_VIOLATION ); break;
357 case ENOENT: set_error( ERROR_FILE_NOT_FOUND ); break;
358 case EISDIR: set_error( ERROR_CANNOT_MAKE ); break;
360 case EMFILE: set_error( ERROR_NO_MORE_FILES ); break;
361 case EEXIST: set_error( ERROR_FILE_EXISTS ); break;
362 case EINVAL: set_error( ERROR_INVALID_PARAMETER ); break;
363 case ESPIPE: set_error( ERROR_SEEK ); break;
364 case ENOTEMPTY: set_error( ERROR_DIR_NOT_EMPTY ); break;
365 default: perror("file_set_error"); set_error( ERROR_UNKNOWN ); break;
369 struct file *get_file_obj( struct process *process, int handle,
370 unsigned int access )
372 return (struct file *)get_handle_obj( current->process, handle,
376 int file_get_mmap_fd( struct file *file )
378 return dup( file->select.fd );
381 static int set_file_pointer( int handle, int *low, int *high, int whence )
388 fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
389 set_error( ERROR_INVALID_PARAMETER );
393 if (!(file = get_file_obj( current->process, handle, 0 )))
395 if ((result = lseek( file->select.fd, *low, whence )) == -1)
397 /* Check for seek before start of file */
398 if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
399 set_error( ERROR_NEGATIVE_SEEK );
402 release_object( file );
406 release_object( file );
410 static int truncate_file( int handle )
415 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
417 if (((result = lseek( file->select.fd, 0, SEEK_CUR )) == -1) ||
418 (ftruncate( file->select.fd, result ) == -1))
421 release_object( file );
424 release_object( file );
429 /* try to grow the file to the specified size */
430 int grow_file( struct file *file, int size_high, int size_low )
436 set_error( ERROR_INVALID_PARAMETER );
439 if (fstat( file->select.fd, &st ) == -1)
444 if (st.st_size >= size_low) return 1; /* already large enough */
445 if (ftruncate( file->select.fd, size_low ) != -1) return 1;
450 static int set_file_time( int handle, time_t access_time, time_t write_time )
453 struct utimbuf utimbuf;
455 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
457 if (!access_time || !write_time)
460 if (stat( file->name, &st ) == -1) goto error;
461 if (!access_time) access_time = st.st_atime;
462 if (!write_time) write_time = st.st_mtime;
464 utimbuf.actime = access_time;
465 utimbuf.modtime = write_time;
466 if (utime( file->name, &utimbuf ) == -1) goto error;
467 release_object( file );
471 release_object( file );
475 static int file_lock( struct file *file, int offset_high, int offset_low,
476 int count_high, int count_low )
478 /* FIXME: implement this */
482 static int file_unlock( struct file *file, int offset_high, int offset_low,
483 int count_high, int count_low )
485 /* FIXME: implement this */
490 DECL_HANDLER(create_file)
492 size_t len = get_req_strlen( req->name );
496 if ((file = create_file( req->name, len, req->access,
497 req->sharing, req->create, req->attrs )))
499 req->handle = alloc_handle( current->process, file, req->access, req->inherit );
500 release_object( file );
504 /* allocate a file handle for a Unix fd */
505 DECL_HANDLER(alloc_file_handle)
510 if ((fd = dup(fd)) != -1)
512 if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE, 0 )))
514 req->handle = alloc_handle( current->process, file, req->access, 0 );
515 release_object( file );
519 else file_set_error();
522 /* get a Unix fd to read from a file */
523 DECL_HANDLER(get_read_fd)
527 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_READ, NULL )))
529 set_reply_fd( current, obj->ops->get_read_fd( obj ) );
530 release_object( obj );
534 /* get a Unix fd to write to a file */
535 DECL_HANDLER(get_write_fd)
539 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
541 set_reply_fd( current, obj->ops->get_write_fd( obj ) );
542 release_object( obj );
546 /* set a file current position */
547 DECL_HANDLER(set_file_pointer)
549 int high = req->high;
551 set_file_pointer( req->handle, &low, &high, req->whence );
553 req->new_high = high;
556 /* truncate (or extend) a file */
557 DECL_HANDLER(truncate_file)
559 truncate_file( req->handle );
562 /* flush a file buffers */
563 DECL_HANDLER(flush_file)
567 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
569 obj->ops->flush( obj );
570 release_object( obj );
574 /* set a file access and modification times */
575 DECL_HANDLER(set_file_time)
577 set_file_time( req->handle, req->access_time, req->write_time );
580 /* get a file information */
581 DECL_HANDLER(get_file_info)
585 if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
587 obj->ops->get_file_info( obj, req );
588 release_object( obj );
592 /* lock a region of a file */
593 DECL_HANDLER(lock_file)
597 if ((file = get_file_obj( current->process, req->handle, 0 )))
599 file_lock( file, req->offset_high, req->offset_low,
600 req->count_high, req->count_low );
601 release_object( file );
605 /* unlock a region of a file */
606 DECL_HANDLER(unlock_file)
610 if ((file = get_file_obj( current->process, req->handle, 0 )))
612 file_unlock( file, req->offset_high, req->offset_low,
613 req->count_high, req->count_low );
614 release_object( file );