2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
15 #ifdef HAVE_SYS_ERRNO_H
16 #include <sys/errno.h>
20 #include <sys/types.h>
34 struct object obj; /* object header */
35 struct file *next; /* next file in hashing list */
36 char *name; /* file name */
37 unsigned int access; /* file access (GENERIC_READ/WRITE) */
38 unsigned int flags; /* flags (FILE_FLAG_*) */
39 unsigned int sharing; /* file sharing mode */
42 #define NAME_HASH_SIZE 37
44 static struct file *file_hash[NAME_HASH_SIZE];
46 static void file_dump( struct object *obj, int verbose );
47 static int file_get_poll_events( struct object *obj );
48 static int file_get_read_fd( struct object *obj );
49 static int file_get_write_fd( struct object *obj );
50 static int file_flush( struct object *obj );
51 static int file_get_info( struct object *obj, struct get_file_info_request *req );
52 static void file_destroy( struct object *obj );
54 static const struct object_ops file_ops =
56 sizeof(struct file), /* size */
58 default_poll_add_queue, /* add_queue */
59 default_poll_remove_queue, /* remove_queue */
60 default_poll_signaled, /* signaled */
61 no_satisfied, /* satisfied */
62 file_get_poll_events, /* get_poll_events */
63 default_poll_event, /* poll_event */
64 file_get_read_fd, /* get_read_fd */
65 file_get_write_fd, /* get_write_fd */
66 file_flush, /* flush */
67 file_get_info, /* get_file_info */
68 file_destroy /* destroy */
72 static int get_name_hash( const char *name )
75 while (*name) hash ^= (unsigned char)*name++;
76 return hash % NAME_HASH_SIZE;
79 /* check if the desired access is possible without violating */
80 /* the sharing mode of other opens of the same file */
81 static int check_sharing( const char *name, int hash, unsigned int access,
82 unsigned int sharing )
85 unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
86 unsigned int existing_access = 0;
88 for (file = file_hash[hash]; file; file = file->next)
90 if (strcmp( file->name, name )) continue;
91 existing_sharing &= file->sharing;
92 existing_access |= file->access;
94 if ((access & GENERIC_READ) && !(existing_sharing & FILE_SHARE_READ)) goto error;
95 if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) goto error;
96 if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) goto error;
97 if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) goto error;
100 set_error( STATUS_SHARING_VIOLATION );
104 /* create a file from a file descriptor */
105 /* if the function fails the fd is closed */
106 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing,
110 if ((file = alloc_object( &file_ops, fd )))
114 file->access = access;
116 file->sharing = sharing;
122 static struct file *create_file( const char *nameptr, size_t len, unsigned int access,
123 unsigned int sharing, int create, unsigned int attrs )
131 if (!(name = mem_alloc( len + 1 ))) return NULL;
132 memcpy( name, nameptr, len );
135 /* check sharing mode */
136 hash = get_name_hash( name );
137 if (!check_sharing( name, hash, access, sharing )) goto error;
141 case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
142 case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
143 case OPEN_ALWAYS: flags = O_CREAT; break;
144 case TRUNCATE_EXISTING: flags = O_TRUNC; break;
145 case OPEN_EXISTING: flags = 0; break;
146 default: set_error( STATUS_INVALID_PARAMETER ); goto error;
148 switch(access & (GENERIC_READ | GENERIC_WRITE))
151 case GENERIC_READ: flags |= O_RDONLY; break;
152 case GENERIC_WRITE: flags |= O_WRONLY; break;
153 case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
156 /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
157 if ((fd = open( name, flags | O_NONBLOCK,
158 (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
160 /* refuse to open a directory */
161 if (fstat( fd, &st ) == -1) goto file_error;
162 if (S_ISDIR(st.st_mode))
164 set_error( STATUS_ACCESS_DENIED );
168 if (!(file = create_file_for_fd( fd, access, sharing, attrs )))
174 file->next = file_hash[hash];
175 file_hash[hash] = file;
181 if (fd != -1) close( fd );
186 /* Create an anonymous Unix file */
187 int create_anonymous_file(void)
194 if (!(name = tmpnam(NULL)))
196 set_error( STATUS_TOO_MANY_OPENED_FILES );
199 fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
200 } while ((fd == -1) && (errno == EEXIST));
210 /* Create a temp file for anonymous mappings */
211 struct file *create_temp_file( int access )
215 if ((fd = create_anonymous_file()) == -1) return NULL;
216 return create_file_for_fd( fd, access, 0, 0 );
219 static void file_dump( struct object *obj, int verbose )
221 struct file *file = (struct file *)obj;
222 assert( obj->ops == &file_ops );
223 fprintf( stderr, "File fd=%d flags=%08x name='%s'\n", file->obj.fd, file->flags, file->name );
226 static int file_get_poll_events( struct object *obj )
228 struct file *file = (struct file *)obj;
230 assert( obj->ops == &file_ops );
231 if (file->access & GENERIC_READ) events |= POLLIN;
232 if (file->access & GENERIC_WRITE) events |= POLLOUT;
236 static int file_get_read_fd( struct object *obj )
238 struct file *file = (struct file *)obj;
239 assert( obj->ops == &file_ops );
240 return dup( file->obj.fd );
243 static int file_get_write_fd( struct object *obj )
245 struct file *file = (struct file *)obj;
246 assert( obj->ops == &file_ops );
247 return dup( file->obj.fd );
250 static int file_flush( struct object *obj )
253 struct file *file = (struct file *)grab_object(obj);
254 assert( obj->ops == &file_ops );
256 ret = (fsync( file->obj.fd ) != -1);
257 if (!ret) file_set_error();
258 release_object( file );
262 static int file_get_info( struct object *obj, struct get_file_info_request *req )
265 struct file *file = (struct file *)obj;
266 assert( obj->ops == &file_ops );
268 if (fstat( file->obj.fd, &st ) == -1)
273 if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
274 S_ISSOCK(st.st_mode) || isatty(file->obj.fd)) req->type = FILE_TYPE_CHAR;
275 else req->type = FILE_TYPE_DISK;
276 if (S_ISDIR(st.st_mode)) req->attr = FILE_ATTRIBUTE_DIRECTORY;
277 else req->attr = FILE_ATTRIBUTE_ARCHIVE;
278 if (!(st.st_mode & S_IWUSR)) req->attr |= FILE_ATTRIBUTE_READONLY;
279 req->access_time = st.st_atime;
280 req->write_time = st.st_mtime;
282 req->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
283 req->links = st.st_nlink;
284 req->index_high = st.st_dev;
285 req->index_low = st.st_ino;
286 req->serial = 0; /* FIXME */
290 static void file_destroy( struct object *obj )
292 struct file *file = (struct file *)obj;
293 assert( obj->ops == &file_ops );
297 /* remove it from the hashing list */
298 struct file **pptr = &file_hash[get_name_hash( file->name )];
299 while (*pptr && *pptr != file) pptr = &(*pptr)->next;
301 *pptr = (*pptr)->next;
302 if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
307 /* set the last error depending on errno */
308 void file_set_error(void)
312 case EAGAIN: set_error( STATUS_SHARING_VIOLATION ); break;
313 case EBADF: set_error( STATUS_INVALID_HANDLE ); break;
314 case ENOSPC: set_error( STATUS_DISK_FULL ); break;
316 case EPERM: set_error( STATUS_ACCESS_DENIED ); break;
317 case EROFS: set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
318 case EBUSY: set_error( STATUS_FILE_LOCK_CONFLICT ); break;
319 case ENOENT: set_error( STATUS_NO_SUCH_FILE ); break;
320 case EISDIR: set_error( 0xc0010000 | ERROR_CANNOT_MAKE /* FIXME */ ); break;
322 case EMFILE: set_error( STATUS_NO_MORE_FILES ); break;
323 case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break;
324 case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break;
325 case ESPIPE: set_error( 0xc0010000 | ERROR_SEEK /* FIXME */ ); break;
326 case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
327 case EIO: set_error( STATUS_ACCESS_VIOLATION ); break;
328 default: perror("file_set_error"); set_error( ERROR_UNKNOWN /* FIXME */ ); break;
332 struct file *get_file_obj( struct process *process, int handle, unsigned int access )
334 return (struct file *)get_handle_obj( process, handle, access, &file_ops );
337 int file_get_mmap_fd( struct file *file )
339 return dup( file->obj.fd );
342 static int set_file_pointer( int handle, int *low, int *high, int whence )
349 fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
350 set_error( STATUS_INVALID_PARAMETER );
354 if (!(file = get_file_obj( current->process, handle, 0 )))
356 if ((result = lseek( file->obj.fd, *low, whence )) == -1)
358 /* Check for seek before start of file */
359 if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
360 set_error( 0xc0010000 | ERROR_NEGATIVE_SEEK /* FIXME */ );
363 release_object( file );
367 release_object( file );
371 static int truncate_file( int handle )
376 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
378 if (((result = lseek( file->obj.fd, 0, SEEK_CUR )) == -1) ||
379 (ftruncate( file->obj.fd, result ) == -1))
382 release_object( file );
385 release_object( file );
390 /* try to grow the file to the specified size */
391 int grow_file( struct file *file, int size_high, int size_low )
397 set_error( STATUS_INVALID_PARAMETER );
400 if (fstat( file->obj.fd, &st ) == -1)
405 if (st.st_size >= size_low) return 1; /* already large enough */
406 if (ftruncate( file->obj.fd, size_low ) != -1) return 1;
411 static int set_file_time( int handle, time_t access_time, time_t write_time )
414 struct utimbuf utimbuf;
416 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
418 if (!access_time || !write_time)
421 if (stat( file->name, &st ) == -1) goto error;
422 if (!access_time) access_time = st.st_atime;
423 if (!write_time) write_time = st.st_mtime;
425 utimbuf.actime = access_time;
426 utimbuf.modtime = write_time;
427 if (utime( file->name, &utimbuf ) == -1) goto error;
428 release_object( file );
432 release_object( file );
436 static int file_lock( struct file *file, int offset_high, int offset_low,
437 int count_high, int count_low )
439 /* FIXME: implement this */
443 static int file_unlock( struct file *file, int offset_high, int offset_low,
444 int count_high, int count_low )
446 /* FIXME: implement this */
451 DECL_HANDLER(create_file)
453 size_t len = get_req_strlen( req->name );
457 if ((file = create_file( req->name, len, req->access,
458 req->sharing, req->create, req->attrs )))
460 req->handle = alloc_handle( current->process, file, req->access, req->inherit );
461 release_object( file );
465 /* allocate a file handle for a Unix fd */
466 DECL_HANDLER(alloc_file_handle)
471 if (current->pass_fd != -1)
473 if ((file = create_file_for_fd( current->pass_fd, req->access,
474 FILE_SHARE_READ | FILE_SHARE_WRITE, 0 )))
476 req->handle = alloc_handle( current->process, file, req->access, 0 );
477 release_object( file );
479 current->pass_fd = -1;
481 else set_error( STATUS_INVALID_PARAMETER );
484 /* get a Unix fd to read from a file */
485 DECL_HANDLER(get_read_fd)
489 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_READ, NULL )))
491 set_reply_fd( current, obj->ops->get_read_fd( obj ) );
492 release_object( obj );
496 /* get a Unix fd to write to a file */
497 DECL_HANDLER(get_write_fd)
501 if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
503 set_reply_fd( current, obj->ops->get_write_fd( obj ) );
504 release_object( obj );
508 /* set a file current position */
509 DECL_HANDLER(set_file_pointer)
511 int high = req->high;
513 set_file_pointer( req->handle, &low, &high, req->whence );
515 req->new_high = high;
518 /* truncate (or extend) a file */
519 DECL_HANDLER(truncate_file)
521 truncate_file( req->handle );
524 /* flush a file buffers */
525 DECL_HANDLER(flush_file)
529 if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
531 obj->ops->flush( obj );
532 release_object( obj );
536 /* set a file access and modification times */
537 DECL_HANDLER(set_file_time)
539 set_file_time( req->handle, req->access_time, req->write_time );
542 /* get a file information */
543 DECL_HANDLER(get_file_info)
547 if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
549 obj->ops->get_file_info( obj, req );
550 release_object( obj );
554 /* lock a region of a file */
555 DECL_HANDLER(lock_file)
559 if ((file = get_file_obj( current->process, req->handle, 0 )))
561 file_lock( file, req->offset_high, req->offset_low,
562 req->count_high, req->count_low );
563 release_object( file );
567 /* unlock a region of a file */
568 DECL_HANDLER(unlock_file)
572 if ((file = get_file_obj( current->process, req->handle, 0 )))
574 file_unlock( file, req->offset_high, req->offset_low,
575 req->count_high, req->count_low );
576 release_object( file );