2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
13 #ifdef HAVE_SYS_ERRNO_H
14 #include <sys/errno.h>
18 #include <sys/types.h>
32 struct object obj; /* object header */
33 struct select_user select; /* select user */
34 struct file *next; /* next file in hashing list */
35 char *name; /* file name */
36 unsigned int access; /* file access (GENERIC_READ/WRITE) */
37 unsigned int flags; /* flags (FILE_FLAG_*) */
38 unsigned int sharing; /* file sharing mode */
41 #define NAME_HASH_SIZE 37
43 static struct file *file_hash[NAME_HASH_SIZE];
45 static void file_dump( struct object *obj, int verbose );
46 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry );
47 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry );
48 static int file_signaled( struct object *obj, struct thread *thread );
49 static int file_get_read_fd( struct object *obj );
50 static int file_get_write_fd( struct object *obj );
51 static int file_flush( struct object *obj );
52 static int file_get_info( struct object *obj, struct get_file_info_request *req );
53 static void file_destroy( struct object *obj );
55 static const struct object_ops file_ops =
71 static int get_name_hash( const char *name )
74 while (*name) hash ^= *name++;
75 return hash % NAME_HASH_SIZE;
78 /* check if the desired access is possible without violating */
79 /* the sharing mode of other opens of the same file */
80 static int check_sharing( const char *name, int hash, unsigned int access,
81 unsigned int sharing )
84 unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
85 unsigned int existing_access = 0;
87 for (file = file_hash[hash]; file; file = file->next)
89 if (strcmp( file->name, name )) continue;
90 existing_sharing &= file->sharing;
91 existing_access |= file->access;
93 if ((access & GENERIC_READ) && !(existing_sharing & FILE_SHARE_READ)) goto error;
94 if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) goto error;
95 if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) goto error;
96 if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) goto error;
99 set_error( ERROR_SHARING_VIOLATION );
103 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing,
107 if ((file = alloc_object( &file_ops )))
111 file->select.fd = fd;
112 file->select.func = default_select_event;
113 file->select.private = file;
114 file->access = access;
116 file->sharing = sharing;
117 register_select_user( &file->select );
123 static struct file *create_file( const char *nameptr, size_t len, unsigned int access,
124 unsigned int sharing, int create, unsigned int attrs )
132 if (!(name = mem_alloc( len + 1 ))) return NULL;
133 memcpy( name, nameptr, len );
136 /* check sharing mode */
137 hash = get_name_hash( name );
138 if (!check_sharing( name, hash, access, sharing )) goto error;
142 case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
143 case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
144 case OPEN_ALWAYS: flags = O_CREAT; break;
145 case TRUNCATE_EXISTING: flags = O_TRUNC; break;
146 case OPEN_EXISTING: flags = 0; break;
147 default: set_error( ERROR_INVALID_PARAMETER ); goto error;
149 switch(access & (GENERIC_READ | GENERIC_WRITE))
152 case GENERIC_READ: flags |= O_RDONLY; break;
153 case GENERIC_WRITE: flags |= O_WRONLY; break;
154 case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
157 /* FIXME: should set error to ERROR_ALREADY_EXISTS if file existed before */
158 if ((fd = open( name, flags | O_NONBLOCK,
159 (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
161 /* refuse to open a directory */
162 if (fstat( fd, &st ) == -1) goto file_error;
163 if (S_ISDIR(st.st_mode))
165 set_error( ERROR_ACCESS_DENIED );
169 if (!(file = create_file_for_fd( fd, access, sharing, attrs ))) goto error;
171 file->next = file_hash[hash];
172 file_hash[hash] = file;
178 if (fd != -1) close( fd );
183 /* Create an anonymous Unix file */
184 int create_anonymous_file(void)
191 if (!(name = tmpnam(NULL)))
193 set_error( ERROR_TOO_MANY_OPEN_FILES );
196 fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
197 } while ((fd == -1) && (errno == EEXIST));
207 /* Create a temp file for anonymous mappings */
208 struct file *create_temp_file( int access )
213 if ((fd = create_anonymous_file()) == -1) return NULL;
214 if (!(file = create_file_for_fd( fd, access, 0, 0 ))) close( fd );
218 static void file_dump( struct object *obj, int verbose )
220 struct file *file = (struct file *)obj;
221 assert( obj->ops == &file_ops );
222 fprintf( stderr, "File fd=%d flags=%08x name='%s'\n",
223 file->select.fd, file->flags, file->name );
226 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry )
228 struct file *file = (struct file *)obj;
229 assert( obj->ops == &file_ops );
230 if (!obj->head) /* first on the queue */
233 if (file->access & GENERIC_READ) events |= READ_EVENT;
234 if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
235 set_select_events( &file->select, events );
237 add_queue( obj, entry );
241 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry )
243 struct file *file = (struct file *)grab_object(obj);
244 assert( obj->ops == &file_ops );
246 remove_queue( obj, entry );
247 if (!obj->head) /* last on the queue is gone */
248 set_select_events( &file->select, 0 );
249 release_object( obj );
252 static int file_signaled( struct object *obj, struct thread *thread )
255 struct file *file = (struct file *)obj;
256 assert( obj->ops == &file_ops );
258 if (file->access & GENERIC_READ) events |= READ_EVENT;
259 if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
260 if (check_select_events( &file->select, events ))
262 /* stop waiting on select() if we are signaled */
263 set_select_events( &file->select, 0 );
268 /* restart waiting on select() if we are no longer signaled */
269 if (obj->head) set_select_events( &file->select, events );
274 static int file_get_read_fd( struct object *obj )
276 struct file *file = (struct file *)obj;
277 assert( obj->ops == &file_ops );
278 return dup( file->select.fd );
281 static int file_get_write_fd( struct object *obj )
283 struct file *file = (struct file *)obj;
284 assert( obj->ops == &file_ops );
285 return dup( file->select.fd );
288 static int file_flush( struct object *obj )
291 struct file *file = (struct file *)grab_object(obj);
292 assert( obj->ops == &file_ops );
294 ret = (fsync( file->select.fd ) != -1);
295 if (!ret) file_set_error();
296 release_object( file );
300 static int file_get_info( struct object *obj, struct get_file_info_request *req )
303 struct file *file = (struct file *)obj;
304 assert( obj->ops == &file_ops );
306 if (fstat( file->select.fd, &st ) == -1)
311 if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
312 S_ISSOCK(st.st_mode) || isatty(file->select.fd)) req->type = FILE_TYPE_CHAR;
313 else req->type = FILE_TYPE_DISK;
314 if (S_ISDIR(st.st_mode)) req->attr = FILE_ATTRIBUTE_DIRECTORY;
315 else req->attr = FILE_ATTRIBUTE_ARCHIVE;
316 if (!(st.st_mode & S_IWUSR)) req->attr |= FILE_ATTRIBUTE_READONLY;
317 req->access_time = st.st_atime;
318 req->write_time = st.st_mtime;
320 req->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
321 req->links = st.st_nlink;
322 req->index_high = st.st_dev;
323 req->index_low = st.st_ino;
324 req->serial = 0; /* FIXME */
328 static void file_destroy( struct object *obj )
330 struct file *file = (struct file *)obj;
331 assert( obj->ops == &file_ops );
335 /* remove it from the hashing list */
336 struct file **pptr = &file_hash[get_name_hash( file->name )];
337 while (*pptr && *pptr != file) pptr = &(*pptr)->next;
339 *pptr = (*pptr)->next;
340 if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
343 unregister_select_user( &file->select );
344 close( file->select.fd );
347 /* set the last error depending on errno */
348 void file_set_error(void)
352 case EAGAIN: set_error( ERROR_SHARING_VIOLATION ); break;
353 case EBADF: set_error( ERROR_INVALID_HANDLE ); break;
354 case ENOSPC: set_error( ERROR_HANDLE_DISK_FULL ); break;
356 case EPERM: set_error( ERROR_ACCESS_DENIED ); break;
357 case EROFS: set_error( ERROR_WRITE_PROTECT ); break;
358 case EBUSY: set_error( ERROR_LOCK_VIOLATION ); break;
359 case ENOENT: set_error( ERROR_FILE_NOT_FOUND ); break;
360 case EISDIR: set_error( ERROR_CANNOT_MAKE ); break;
362 case EMFILE: set_error( ERROR_NO_MORE_FILES ); break;
363 case EEXIST: set_error( ERROR_FILE_EXISTS ); break;
364 case EINVAL: set_error( ERROR_INVALID_PARAMETER ); break;
365 case ESPIPE: set_error( ERROR_SEEK ); break;
366 case ENOTEMPTY: set_error( ERROR_DIR_NOT_EMPTY ); break;
367 default: perror("file_set_error"); set_error( ERROR_UNKNOWN ); break;
371 struct file *get_file_obj( struct process *process, int handle,
372 unsigned int access )
374 return (struct file *)get_handle_obj( current->process, handle,
378 int file_get_mmap_fd( struct file *file )
380 return dup( file->select.fd );
383 static int set_file_pointer( int handle, int *low, int *high, int whence )
390 fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
391 set_error( ERROR_INVALID_PARAMETER );
395 if (!(file = get_file_obj( current->process, handle, 0 )))
397 if ((result = lseek( file->select.fd, *low, whence )) == -1)
399 /* Check for seek before start of file */
400 if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
401 set_error( ERROR_NEGATIVE_SEEK );
404 release_object( file );
408 release_object( file );
412 static int truncate_file( int handle )
417 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
419 if (((result = lseek( file->select.fd, 0, SEEK_CUR )) == -1) ||
420 (ftruncate( file->select.fd, result ) == -1))
423 release_object( file );
426 release_object( file );
431 /* try to grow the file to the specified size */
432 int grow_file( struct file *file, int size_high, int size_low )
438 set_error( ERROR_INVALID_PARAMETER );
441 if (fstat( file->select.fd, &st ) == -1)
446 if (st.st_size >= size_low) return 1; /* already large enough */
447 if (ftruncate( file->select.fd, size_low ) != -1) return 1;
452 static int set_file_time( int handle, time_t access_time, time_t write_time )
455 struct utimbuf utimbuf;
457 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
459 if (!access_time || !write_time)
462 if (stat( file->name, &st ) == -1) goto error;
463 if (!access_time) access_time = st.st_atime;
464 if (!write_time) write_time = st.st_mtime;
466 utimbuf.actime = access_time;
467 utimbuf.modtime = write_time;
468 if (utime( file->name, &utimbuf ) == -1) goto error;
469 release_object( file );
473 release_object( file );
477 static int file_lock( struct file *file, int offset_high, int offset_low,
478 int count_high, int count_low )
480 /* FIXME: implement this */
484 static int file_unlock( struct file *file, int offset_high, int offset_low,
485 int count_high, int count_low )
487 /* FIXME: implement this */
492 DECL_HANDLER(create_file)
494 size_t len = get_req_strlen( req->name );
498 if ((file = create_file( req->name, len, req->access,
499 req->sharing, req->create, req->attrs )))
501 req->handle = alloc_handle( current->process, file, req->access, req->inherit );
502 release_object( file );
506 /* allocate a file handle for a Unix fd */
507 DECL_HANDLER(alloc_file_handle)
512 if ((fd = dup(fd)) != -1)
514 if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE, 0 )))
516 req->handle = alloc_handle( current->process, file, req->access, 0 );
517 release_object( file );
521 else file_set_error();
524 /* get a Unix fd to read from a file */
525 DECL_HANDLER(get_read_fd)
529 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_READ, NULL )))
531 set_reply_fd( current, obj->ops->get_read_fd( obj ) );
532 release_object( obj );
536 /* get a Unix fd to write to a file */
537 DECL_HANDLER(get_write_fd)
541 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
543 set_reply_fd( current, obj->ops->get_write_fd( obj ) );
544 release_object( obj );
548 /* set a file current position */
549 DECL_HANDLER(set_file_pointer)
551 int high = req->high;
553 set_file_pointer( req->handle, &low, &high, req->whence );
555 req->new_high = high;
558 /* truncate (or extend) a file */
559 DECL_HANDLER(truncate_file)
561 truncate_file( req->handle );
564 /* flush a file buffers */
565 DECL_HANDLER(flush_file)
569 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
571 obj->ops->flush( obj );
572 release_object( obj );
576 /* set a file access and modification times */
577 DECL_HANDLER(set_file_time)
579 set_file_time( req->handle, req->access_time, req->write_time );
582 /* get a file information */
583 DECL_HANDLER(get_file_info)
587 if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
589 obj->ops->get_file_info( obj, req );
590 release_object( obj );
594 /* lock a region of a file */
595 DECL_HANDLER(lock_file)
599 if ((file = get_file_obj( current->process, req->handle, 0 )))
601 file_lock( file, req->offset_high, req->offset_low,
602 req->count_high, req->count_low );
603 release_object( file );
607 /* unlock a region of a file */
608 DECL_HANDLER(unlock_file)
612 if ((file = get_file_obj( current->process, req->handle, 0 )))
614 file_unlock( file, req->offset_high, req->offset_low,
615 req->count_high, req->count_low );
616 release_object( file );