2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
13 #include <sys/errno.h>
16 #include <sys/types.h>
23 #include "server/process.h"
24 #include "server/thread.h"
28 struct object obj; /* object header */
29 struct file *next; /* next file in hashing list */
30 char *name; /* file name */
31 int fd; /* Unix file descriptor */
32 unsigned int access; /* file access (GENERIC_READ/WRITE) */
33 unsigned int flags; /* flags (FILE_FLAG_*) */
34 unsigned int sharing; /* file sharing mode */
37 #define NAME_HASH_SIZE 37
39 static struct file *file_hash[NAME_HASH_SIZE];
41 static void file_dump( struct object *obj, int verbose );
42 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry );
43 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry );
44 static int file_signaled( struct object *obj, struct thread *thread );
45 static int file_get_read_fd( struct object *obj );
46 static int file_get_write_fd( struct object *obj );
47 static int file_flush( struct object *obj );
48 static int file_get_info( struct object *obj, struct get_file_info_reply *reply );
49 static void file_destroy( struct object *obj );
51 static const struct object_ops file_ops =
65 static const struct select_ops select_ops =
68 NULL /* we never set a timeout on a file */
72 static int get_name_hash( const char *name )
75 while (*name) hash ^= *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)) return 0;
95 if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) return 0;
96 if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) return 0;
97 if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) return 0;
101 struct object *create_file( int fd, const char *name, unsigned int access,
102 unsigned int sharing, int create, unsigned int attrs )
114 SET_ERROR( ERROR_INVALID_PARAMETER );
118 /* check sharing mode */
119 hash = get_name_hash( name );
120 if (!check_sharing( name, hash, access, sharing ))
122 SET_ERROR( ERROR_SHARING_VIOLATION );
128 case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
129 case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
130 case OPEN_ALWAYS: flags = O_CREAT; break;
131 case TRUNCATE_EXISTING: flags = O_TRUNC; break;
132 case OPEN_EXISTING: flags = 0; break;
133 default: SET_ERROR( ERROR_INVALID_PARAMETER ); return NULL;
135 switch(access & (GENERIC_READ | GENERIC_WRITE))
138 case GENERIC_READ: flags |= O_RDONLY; break;
139 case GENERIC_WRITE: flags |= O_WRONLY; break;
140 case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
143 /* FIXME: should set error to ERROR_ALREADY_EXISTS if file existed before */
144 if ((fd = open( name, flags | O_NONBLOCK,
145 (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
150 /* Refuse to open a directory */
151 if (fstat( fd, &st ) == -1)
157 if (S_ISDIR(st.st_mode))
159 SET_ERROR( ERROR_ACCESS_DENIED );
166 if ((fd = dup(fd)) == -1)
173 if (!(file = mem_alloc( sizeof(*file) )))
180 if (!(file->name = mem_alloc( strlen(name) + 1 )))
186 strcpy( file->name, name );
187 file->next = file_hash[hash];
188 file_hash[hash] = file;
195 init_object( &file->obj, &file_ops, NULL );
197 file->access = access;
199 file->sharing = sharing;
204 /* Create a temp file for anonymous mappings */
205 struct file *create_temp_file( int access )
213 if (!(name = tmpnam(NULL)))
215 SET_ERROR( ERROR_TOO_MANY_OPEN_FILES );
218 fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
219 } while ((fd == -1) && (errno == EEXIST));
227 if (!(file = mem_alloc( sizeof(*file) )))
232 init_object( &file->obj, &file_ops, NULL );
236 file->access = access;
243 static void file_dump( struct object *obj, int verbose )
245 struct file *file = (struct file *)obj;
246 assert( obj->ops == &file_ops );
247 printf( "File fd=%d flags=%08x name='%s'\n",
248 file->fd, file->flags, file->name );
251 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry )
253 struct file *file = (struct file *)obj;
254 assert( obj->ops == &file_ops );
255 if (!obj->head) /* first on the queue */
257 if (!add_select_user( file->fd, READ_EVENT | WRITE_EVENT, &select_ops, file ))
259 SET_ERROR( ERROR_OUTOFMEMORY );
263 add_queue( obj, entry );
267 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry )
269 struct file *file = (struct file *)grab_object(obj);
270 assert( obj->ops == &file_ops );
272 remove_queue( obj, entry );
273 if (!obj->head) /* last on the queue is gone */
274 remove_select_user( file->fd );
275 release_object( obj );
278 static int file_signaled( struct object *obj, struct thread *thread )
280 fd_set read_fds, write_fds;
281 struct timeval tv = { 0, 0 };
283 struct file *file = (struct file *)obj;
284 assert( obj->ops == &file_ops );
286 FD_ZERO( &read_fds );
287 FD_ZERO( &write_fds );
288 if (file->access & GENERIC_READ) FD_SET( file->fd, &read_fds );
289 if (file->access & GENERIC_WRITE) FD_SET( file->fd, &write_fds );
290 return select( file->fd + 1, &read_fds, &write_fds, NULL, &tv ) > 0;
293 static int file_get_read_fd( struct object *obj )
295 struct file *file = (struct file *)obj;
296 assert( obj->ops == &file_ops );
297 return dup( file->fd );
300 static int file_get_write_fd( struct object *obj )
302 struct file *file = (struct file *)obj;
303 assert( obj->ops == &file_ops );
304 return dup( file->fd );
307 static int file_flush( struct object *obj )
310 struct file *file = (struct file *)grab_object(obj);
311 assert( obj->ops == &file_ops );
313 ret = (fsync( file->fd ) != -1);
314 if (!ret) file_set_error();
315 release_object( file );
319 static int file_get_info( struct object *obj, struct get_file_info_reply *reply )
322 struct file *file = (struct file *)obj;
323 assert( obj->ops == &file_ops );
325 if (fstat( file->fd, &st ) == -1)
330 if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
331 S_ISSOCK(st.st_mode) || isatty(file->fd)) reply->type = FILE_TYPE_CHAR;
332 else reply->type = FILE_TYPE_DISK;
333 if (S_ISDIR(st.st_mode)) reply->attr = FILE_ATTRIBUTE_DIRECTORY;
334 else reply->attr = FILE_ATTRIBUTE_ARCHIVE;
335 if (!(st.st_mode & S_IWUSR)) reply->attr |= FILE_ATTRIBUTE_READONLY;
336 reply->access_time = st.st_atime;
337 reply->write_time = st.st_mtime;
338 reply->size_high = 0;
339 reply->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
340 reply->links = st.st_nlink;
341 reply->index_high = st.st_dev;
342 reply->index_low = st.st_ino;
343 reply->serial = 0; /* FIXME */
347 static void file_destroy( struct object *obj )
349 struct file *file = (struct file *)obj;
350 assert( obj->ops == &file_ops );
354 /* remove it from the hashing list */
355 struct file **pptr = &file_hash[get_name_hash( file->name )];
356 while (*pptr && *pptr != file) pptr = &(*pptr)->next;
358 *pptr = (*pptr)->next;
359 if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
366 /* set the last error depending on errno */
367 void file_set_error(void)
371 case EAGAIN: SET_ERROR( ERROR_SHARING_VIOLATION ); break;
372 case EBADF: SET_ERROR( ERROR_INVALID_HANDLE ); break;
373 case ENOSPC: SET_ERROR( ERROR_HANDLE_DISK_FULL ); break;
375 case EPERM: SET_ERROR( ERROR_ACCESS_DENIED ); break;
376 case EROFS: SET_ERROR( ERROR_WRITE_PROTECT ); break;
377 case EBUSY: SET_ERROR( ERROR_LOCK_VIOLATION ); break;
378 case ENOENT: SET_ERROR( ERROR_FILE_NOT_FOUND ); break;
379 case EISDIR: SET_ERROR( ERROR_CANNOT_MAKE ); break;
381 case EMFILE: SET_ERROR( ERROR_NO_MORE_FILES ); break;
382 case EEXIST: SET_ERROR( ERROR_FILE_EXISTS ); break;
383 case EINVAL: SET_ERROR( ERROR_INVALID_PARAMETER ); break;
384 case ESPIPE: SET_ERROR( ERROR_SEEK ); break;
385 case ENOTEMPTY: SET_ERROR( ERROR_DIR_NOT_EMPTY ); break;
386 default: perror("file_set_error"); SET_ERROR( ERROR_UNKNOWN ); break;
390 struct file *get_file_obj( struct process *process, int handle,
391 unsigned int access )
393 return (struct file *)get_handle_obj( current->process, handle,
397 int file_get_mmap_fd( struct file *file )
399 return dup( file->fd );
402 int set_file_pointer( int handle, int *low, int *high, int whence )
409 fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
410 SET_ERROR( ERROR_INVALID_PARAMETER );
414 if (!(file = get_file_obj( current->process, handle, 0 )))
416 if ((result = lseek( file->fd, *low, whence )) == -1)
418 /* Check for seek before start of file */
419 if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
420 SET_ERROR( ERROR_NEGATIVE_SEEK );
423 release_object( file );
427 release_object( file );
431 int truncate_file( int handle )
436 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
438 if (((result = lseek( file->fd, 0, SEEK_CUR )) == -1) ||
439 (ftruncate( file->fd, result ) == -1))
442 release_object( file );
445 release_object( file );
450 /* try to grow the file to the specified size */
451 int grow_file( struct file *file, int size_high, int size_low )
457 SET_ERROR( ERROR_INVALID_PARAMETER );
460 if (fstat( file->fd, &st ) == -1)
465 if (st.st_size >= size_low) return 1; /* already large enough */
466 if (ftruncate( file->fd, size_low ) != -1) return 1;
471 int set_file_time( int handle, time_t access_time, time_t write_time )
474 struct utimbuf utimbuf;
476 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
478 if (!access_time || !write_time)
481 if (stat( file->name, &st ) == -1) goto error;
482 if (!access_time) access_time = st.st_atime;
483 if (!write_time) write_time = st.st_mtime;
485 utimbuf.actime = access_time;
486 utimbuf.modtime = write_time;
487 if (utime( file->name, &utimbuf ) == -1) goto error;
488 release_object( file );
492 release_object( file );
496 int file_lock( struct file *file, int offset_high, int offset_low,
497 int count_high, int count_low )
499 /* FIXME: implement this */
503 int file_unlock( struct file *file, int offset_high, int offset_low,
504 int count_high, int count_low )
506 /* FIXME: implement this */