2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
12 #include <sys/errno.h>
15 #include <sys/types.h>
22 #include "server/thread.h"
26 struct object obj; /* object header */
27 struct file *next; /* next file in hashing list */
28 char *name; /* file name */
29 int fd; /* Unix file descriptor */
30 unsigned int access; /* file access (GENERIC_READ/WRITE) */
31 unsigned int flags; /* flags (FILE_FLAG_*) */
32 unsigned int sharing; /* file sharing mode */
35 #define NAME_HASH_SIZE 37
37 static struct file *file_hash[NAME_HASH_SIZE];
39 static void file_dump( struct object *obj, int verbose );
40 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry );
41 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry );
42 static int file_signaled( struct object *obj, struct thread *thread );
43 static int file_get_read_fd( struct object *obj );
44 static int file_get_write_fd( struct object *obj );
45 static int file_flush( struct object *obj );
46 static int file_get_info( struct object *obj, struct get_file_info_reply *reply );
47 static void file_destroy( struct object *obj );
49 static const struct object_ops file_ops =
63 static const struct select_ops select_ops =
66 NULL /* we never set a timeout on a file */
70 static int get_name_hash( const char *name )
73 while (*name) hash ^= *name++;
74 return hash % NAME_HASH_SIZE;
77 /* check if the desired access is possible without violating */
78 /* the sharing mode of other opens of the same file */
79 static int check_sharing( const char *name, int hash, unsigned int access,
80 unsigned int sharing )
83 unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
84 unsigned int existing_access = 0;
86 for (file = file_hash[hash]; file; file = file->next)
88 if (strcmp( file->name, name )) continue;
89 existing_sharing &= file->sharing;
90 existing_access |= file->access;
92 if ((access & GENERIC_READ) && !(existing_sharing & FILE_SHARE_READ)) return 0;
93 if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) return 0;
94 if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) return 0;
95 if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) return 0;
99 struct object *create_file( int fd, const char *name, unsigned int access,
100 unsigned int sharing, int create, unsigned int attrs )
112 SET_ERROR( ERROR_INVALID_PARAMETER );
116 /* check sharing mode */
117 hash = get_name_hash( name );
118 if (!check_sharing( name, hash, access, sharing ))
120 SET_ERROR( ERROR_SHARING_VIOLATION );
126 case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
127 case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
128 case OPEN_ALWAYS: flags = O_CREAT; break;
129 case TRUNCATE_EXISTING: flags = O_TRUNC; break;
130 case OPEN_EXISTING: flags = 0; break;
131 default: SET_ERROR( ERROR_INVALID_PARAMETER ); return NULL;
133 switch(access & (GENERIC_READ | GENERIC_WRITE))
136 case GENERIC_READ: flags |= O_RDONLY; break;
137 case GENERIC_WRITE: flags |= O_WRONLY; break;
138 case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
141 if ((fd = open( name, flags | O_NONBLOCK,
142 (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
147 /* Refuse to open a directory */
148 if (fstat( fd, &st ) == -1)
154 if (S_ISDIR(st.st_mode))
156 SET_ERROR( ERROR_ACCESS_DENIED );
163 if ((fd = dup(fd)) == -1)
170 if (!(file = mem_alloc( sizeof(*file) )))
177 if (!(file->name = mem_alloc( strlen(name) + 1 )))
183 strcpy( file->name, name );
184 file->next = file_hash[hash];
185 file_hash[hash] = file;
192 init_object( &file->obj, &file_ops, NULL );
194 file->access = access;
196 file->sharing = sharing;
201 static void file_dump( struct object *obj, int verbose )
203 struct file *file = (struct file *)obj;
204 assert( obj->ops == &file_ops );
205 printf( "File fd=%d flags=%08x name='%s'\n",
206 file->fd, file->flags, file->name );
209 static int file_add_queue( struct object *obj, struct wait_queue_entry *entry )
211 struct file *file = (struct file *)obj;
212 assert( obj->ops == &file_ops );
213 if (!obj->head) /* first on the queue */
215 if (!add_select_user( file->fd, READ_EVENT | WRITE_EVENT, &select_ops, file ))
217 SET_ERROR( ERROR_OUTOFMEMORY );
221 add_queue( obj, entry );
225 static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry )
227 struct file *file = (struct file *)grab_object(obj);
228 assert( obj->ops == &file_ops );
230 remove_queue( obj, entry );
231 if (!obj->head) /* last on the queue is gone */
232 remove_select_user( file->fd );
233 release_object( obj );
236 static int file_signaled( struct object *obj, struct thread *thread )
238 fd_set read_fds, write_fds;
239 struct timeval tv = { 0, 0 };
241 struct file *file = (struct file *)obj;
242 assert( obj->ops == &file_ops );
244 FD_ZERO( &read_fds );
245 FD_ZERO( &write_fds );
246 if (file->access & GENERIC_READ) FD_SET( file->fd, &read_fds );
247 if (file->access & GENERIC_WRITE) FD_SET( file->fd, &write_fds );
248 return select( file->fd + 1, &read_fds, &write_fds, NULL, &tv ) > 0;
251 static int file_get_read_fd( struct object *obj )
253 struct file *file = (struct file *)obj;
254 assert( obj->ops == &file_ops );
255 return dup( file->fd );
258 static int file_get_write_fd( struct object *obj )
260 struct file *file = (struct file *)obj;
261 assert( obj->ops == &file_ops );
262 return dup( file->fd );
265 static int file_flush( struct object *obj )
268 struct file *file = (struct file *)grab_object(obj);
269 assert( obj->ops == &file_ops );
271 ret = (fsync( file->fd ) != -1);
272 if (!ret) file_set_error();
273 release_object( file );
277 static int file_get_info( struct object *obj, struct get_file_info_reply *reply )
280 struct file *file = (struct file *)obj;
281 assert( obj->ops == &file_ops );
283 if (fstat( file->fd, &st ) == -1)
288 if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
289 S_ISSOCK(st.st_mode) || isatty(file->fd)) reply->type = FILE_TYPE_CHAR;
290 else reply->type = FILE_TYPE_DISK;
291 if (S_ISDIR(st.st_mode)) reply->attr = FILE_ATTRIBUTE_DIRECTORY;
292 else reply->attr = FILE_ATTRIBUTE_ARCHIVE;
293 if (!(st.st_mode & S_IWUSR)) reply->attr |= FILE_ATTRIBUTE_READONLY;
294 reply->access_time = st.st_atime;
295 reply->write_time = st.st_mtime;
296 reply->size_high = 0;
297 reply->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
298 reply->links = st.st_nlink;
299 reply->index_high = st.st_dev;
300 reply->index_low = st.st_ino;
301 reply->serial = 0; /* FIXME */
305 static void file_destroy( struct object *obj )
307 struct file *file = (struct file *)obj;
308 assert( obj->ops == &file_ops );
312 /* remove it from the hashing list */
313 struct file **pptr = &file_hash[get_name_hash( file->name )];
314 while (*pptr && *pptr != file) pptr = &(*pptr)->next;
316 *pptr = (*pptr)->next;
323 /* set the last error depending on errno */
324 void file_set_error(void)
328 case EAGAIN: SET_ERROR( ERROR_SHARING_VIOLATION ); break;
329 case EBADF: SET_ERROR( ERROR_INVALID_HANDLE ); break;
330 case ENOSPC: SET_ERROR( ERROR_HANDLE_DISK_FULL ); break;
332 case EPERM: SET_ERROR( ERROR_ACCESS_DENIED ); break;
333 case EROFS: SET_ERROR( ERROR_WRITE_PROTECT ); break;
334 case EBUSY: SET_ERROR( ERROR_LOCK_VIOLATION ); break;
335 case ENOENT: SET_ERROR( ERROR_FILE_NOT_FOUND ); break;
336 case EISDIR: SET_ERROR( ERROR_CANNOT_MAKE ); break;
338 case EMFILE: SET_ERROR( ERROR_NO_MORE_FILES ); break;
339 case EEXIST: SET_ERROR( ERROR_FILE_EXISTS ); break;
340 case EINVAL: SET_ERROR( ERROR_INVALID_PARAMETER ); break;
341 case ESPIPE: SET_ERROR( ERROR_SEEK ); break;
342 case ENOTEMPTY: SET_ERROR( ERROR_DIR_NOT_EMPTY ); break;
343 default: perror("file_set_error"); SET_ERROR( ERROR_UNKNOWN ); break;
347 struct file *get_file_obj( struct process *process, int handle,
348 unsigned int access )
350 return (struct file *)get_handle_obj( current->process, handle,
354 int file_get_mmap_fd( struct file *file )
356 return dup( file->fd );
359 int set_file_pointer( int handle, int *low, int *high, int whence )
366 fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
367 SET_ERROR( ERROR_INVALID_PARAMETER );
371 if (!(file = get_file_obj( current->process, handle, 0 )))
373 if ((result = lseek( file->fd, *low, whence )) == -1)
375 /* Check for seek before start of file */
376 if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
377 SET_ERROR( ERROR_NEGATIVE_SEEK );
380 release_object( file );
384 release_object( file );
388 int truncate_file( int handle )
393 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
395 if (((result = lseek( file->fd, 0, SEEK_CUR )) == -1) ||
396 (ftruncate( file->fd, result ) == -1))
399 release_object( file );
402 release_object( file );
407 int set_file_time( int handle, time_t access_time, time_t write_time )
410 struct utimbuf utimbuf;
412 if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
414 if (!access_time || !write_time)
417 if (stat( file->name, &st ) == -1) goto error;
418 if (!access_time) access_time = st.st_atime;
419 if (!write_time) write_time = st.st_mtime;
421 utimbuf.actime = access_time;
422 utimbuf.modtime = write_time;
423 if (utime( file->name, &utimbuf ) == -1) goto error;
424 release_object( file );
428 release_object( file );
432 int file_lock( struct file *file, int offset_high, int offset_low,
433 int count_high, int count_low )
435 /* FIXME: implement this */
439 int file_unlock( struct file *file, int offset_high, int offset_low,
440 int count_high, int count_low )
442 /* FIXME: implement this */