server/file.c

   1 /*
   2  * Server-side file management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #ifdef HAVE_SYS_ERRNO_H
  32 #include <sys/errno.h>
  33 #endif
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39 #ifdef HAVE_UTIME_H
  40 #include <utime.h>
  41 #endif
  42
  43 #include "winerror.h"
  44 #include "windef.h"
  45 #include "winbase.h"
  46 #include "winreg.h"
  47 #include "winternl.h"
  48
  49 #include "file.h"
  50 #include "handle.h"
  51 #include "thread.h"
  52 #include "request.h"
  53 #include "async.h"
  54
  55 struct file
  56 {
  57     struct object       obj;        /* object header */
  58     struct fd          *fd;         /* file descriptor for this file */
  59     unsigned int        access;     /* file access (GENERIC_READ/WRITE) */
  60     unsigned int        options;    /* file options (FILE_DELETE_ON_CLOSE, FILE_SYNCHRONOUS...) */
  61     struct async_queue  read_q;
  62     struct async_queue  write_q;
  63 };
  64
  65 static void file_dump( struct object *obj, int verbose );
  66 static struct fd *file_get_fd( struct object *obj );
  67 static void file_destroy( struct object *obj );
  68
  69 static int file_get_poll_events( struct fd *fd );
  70 static void file_poll_event( struct fd *fd, int event );
  71 static int file_flush( struct fd *fd, struct event **event );
  72 static int file_get_info( struct fd *fd, int *flags );
  73 static void file_queue_async( struct fd *fd, void *ptr, unsigned int status, int type, int count );
  74
  75 static const struct object_ops file_ops =
  76 {
  77     sizeof(struct file),          /* size */
  78     file_dump,                    /* dump */
  79     default_fd_add_queue,         /* add_queue */
  80     default_fd_remove_queue,      /* remove_queue */
  81     default_fd_signaled,          /* signaled */
  82     no_satisfied,                 /* satisfied */
  83     file_get_fd,                  /* get_fd */
  84     file_destroy                  /* destroy */
  85 };
  86
  87 static const struct fd_ops file_fd_ops =
  88 {
  89     file_get_poll_events,         /* get_poll_events */
  90     file_poll_event,              /* poll_event */
  91     file_flush,                   /* flush */
  92     file_get_info,                /* get_file_info */
  93     file_queue_async              /* queue_async */
  94 };
  95
  96 static inline int is_overlapped( const struct file *file )
  97 {
  98     return !(file->options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
  99 }
 100
 101 /* create a file from a file descriptor */
 102 /* if the function fails the fd is closed */
 103 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 104 {
 105     struct file *file;
 106
 107     if ((file = alloc_object( &file_ops )))
 108     {
 109         file->access     = access;
 110         file->options    = FILE_SYNCHRONOUS_IO_NONALERT;
 111         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj )))
 112         {
 113             release_object( file );
 114             return NULL;
 115         }
 116     }
 117     return file;
 118 }
 119
 120
 121 static struct object *create_file( const char *nameptr, size_t len, unsigned int access,
 122                                    unsigned int sharing, int create, unsigned int options,
 123                                    unsigned int attrs )
 124 {
 125     struct file *file;
 126     int flags;
 127     char *name;
 128     mode_t mode;
 129
 130     if (!(name = mem_alloc( len + 1 ))) return NULL;
 131     memcpy( name, nameptr, len );
 132     name[len] = 0;
 133
 134     switch(create)
 135     {
 136     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 137     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 138     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 139     case FILE_OPEN:         flags = 0; break;
 140     case FILE_OPEN_IF:      flags = O_CREAT; break;
 141     case FILE_OVERWRITE:    flags = O_TRUNC; break;
 142     default:                set_error( STATUS_INVALID_PARAMETER ); goto error;
 143     }
 144     switch(access & (GENERIC_READ | GENERIC_WRITE))
 145     {
 146     case 0: break;
 147     case GENERIC_READ:  flags |= O_RDONLY; break;
 148     case GENERIC_WRITE: flags |= O_WRONLY; break;
 149     case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
 150     }
 151     mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 152
 153     if (len >= 4 &&
 154         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 155         mode |= 0111;
 156
 157     if (!(file = alloc_object( &file_ops ))) goto error;
 158
 159     file->access     = access;
 160     file->options    = options;
 161     if (is_overlapped( file ))
 162     {
 163         init_async_queue (&file->read_q);
 164         init_async_queue (&file->write_q);
 165     }
 166
 167     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 168     if (!(file->fd = alloc_fd( &file_fd_ops, &file->obj )) ||
 169         !(file->fd = open_fd( file->fd, name, flags | O_NONBLOCK | O_LARGEFILE,
 170                               &mode, access, sharing,
 171                               (options & FILE_DELETE_ON_CLOSE) ? name : "" )))
 172     {
 173         free( name );
 174         release_object( file );
 175         return NULL;
 176     }
 177     free( name );
 178
 179     /* refuse to open a directory */
 180     if (S_ISDIR(mode) && !(options & FILE_OPEN_FOR_BACKUP_INTENT))
 181     {
 182         set_error( STATUS_ACCESS_DENIED );
 183         release_object( file );
 184         return NULL;
 185     }
 186     /* check for serial port */
 187     if (S_ISCHR(mode) && is_serial_fd( file->fd ))
 188     {
 189         struct object *obj = create_serial( file->fd, file->options );
 190         release_object( file );
 191         return obj;
 192     }
 193
 194     return &file->obj;
 195
 196  error:
 197     free( name );
 198     return NULL;
 199 }
 200
 201 /* check if two file objects point to the same file */
 202 int is_same_file( struct file *file1, struct file *file2 )
 203 {
 204     return is_same_file_fd( file1->fd, file2->fd );
 205 }
 206
 207 /* create a temp file for anonymous mappings */
 208 struct file *create_temp_file( int access )
 209 {
 210     char tmpfn[16];
 211     int fd;
 212
 213     sprintf( tmpfn, "anonmap.XXXXXX" );  /* create it in the server directory */
 214     fd = mkstemps( tmpfn, 0 );
 215     if (fd == -1)
 216     {
 217         file_set_error();
 218         return NULL;
 219     }
 220     unlink( tmpfn );
 221     return create_file_for_fd( fd, access, 0 );
 222 }
 223
 224 static void file_dump( struct object *obj, int verbose )
 225 {
 226     struct file *file = (struct file *)obj;
 227     assert( obj->ops == &file_ops );
 228     fprintf( stderr, "File fd=%p options=%08x\n", file->fd, file->options );
 229 }
 230
 231 static int file_get_poll_events( struct fd *fd )
 232 {
 233     struct file *file = get_fd_user( fd );
 234     int events = 0;
 235     assert( file->obj.ops == &file_ops );
 236     if (file->access & GENERIC_READ) events |= POLLIN;
 237     if (file->access & GENERIC_WRITE) events |= POLLOUT;
 238     return events;
 239 }
 240
 241 static void file_poll_event( struct fd *fd, int event )
 242 {
 243     struct file *file = get_fd_user( fd );
 244     assert( file->obj.ops == &file_ops );
 245     if (is_overlapped( file ))
 246     {
 247         if( IS_READY(file->read_q) && (POLLIN & event) )
 248         {
 249             async_notify(file->read_q.head, STATUS_ALERTED);
 250             return;
 251         }
 252         if( IS_READY(file->write_q) && (POLLOUT & event) )
 253         {
 254             async_notify(file->write_q.head, STATUS_ALERTED);
 255             return;
 256         }
 257     }
 258     default_poll_event( fd, event );
 259 }
 260
 261
 262 static int file_flush( struct fd *fd, struct event **event )
 263 {
 264     int ret = (fsync( get_unix_fd(fd) ) != -1);
 265     if (!ret) file_set_error();
 266     return ret;
 267 }
 268
 269 static int file_get_info( struct fd *fd, int *flags )
 270 {
 271     struct file *file = get_fd_user( fd );
 272
 273     *flags = 0;
 274     if (is_overlapped( file )) *flags |= FD_FLAG_OVERLAPPED;
 275     return FD_TYPE_DEFAULT;
 276 }
 277
 278 static void file_queue_async(struct fd *fd, void *ptr, unsigned int status, int type, int count)
 279 {
 280     struct file *file = get_fd_user( fd );
 281     struct async *async;
 282     struct async_queue *q;
 283
 284     assert( file->obj.ops == &file_ops );
 285
 286     if (!is_overlapped( file ))
 287     {
 288         set_error ( STATUS_INVALID_HANDLE );
 289         return;
 290     }
 291
 292     switch(type)
 293     {
 294     case ASYNC_TYPE_READ:
 295         q = &file->read_q;
 296         break;
 297     case ASYNC_TYPE_WRITE:
 298         q = &file->write_q;
 299         break;
 300     default:
 301         set_error( STATUS_INVALID_PARAMETER );
 302         return;
 303     }
 304
 305     async = find_async ( q, current, ptr );
 306
 307     if ( status == STATUS_PENDING )
 308     {
 309         int events;
 310
 311         if ( !async )
 312             async = create_async ( &file->obj, current, ptr );
 313         if ( !async )
 314             return;
 315
 316         async->status = STATUS_PENDING;
 317         if ( !async->q )
 318             async_insert( q, async );
 319
 320         /* Check if the new pending request can be served immediately */
 321         events = check_fd_events( fd, file_get_poll_events( fd ) );
 322         if (events) file_poll_event ( fd, events );
 323     }
 324     else if ( async ) destroy_async ( async );
 325     else set_error ( STATUS_INVALID_PARAMETER );
 326
 327     set_fd_events( fd, file_get_poll_events( fd ));
 328 }
 329
 330 static struct fd *file_get_fd( struct object *obj )
 331 {
 332     struct file *file = (struct file *)obj;
 333     assert( obj->ops == &file_ops );
 334     return (struct fd *)grab_object( file->fd );
 335 }
 336
 337 static void file_destroy( struct object *obj )
 338 {
 339     struct file *file = (struct file *)obj;
 340     assert( obj->ops == &file_ops );
 341
 342     if (is_overlapped( file ))
 343     {
 344         destroy_async_queue (&file->read_q);
 345         destroy_async_queue (&file->write_q);
 346     }
 347     if (file->fd) release_object( file->fd );
 348 }
 349
 350 /* set the last error depending on errno */
 351 void file_set_error(void)
 352 {
 353     switch (errno)
 354     {
 355     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 356     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 357     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 358     case EACCES:
 359     case ESRCH:
 360     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 361     case EROFS:     set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
 362     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 363     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 364     case EISDIR:    set_win32_error( ERROR_CANNOT_MAKE ); break;
 365     case ENFILE:
 366     case EMFILE:    set_error( STATUS_NO_MORE_FILES ); break;
 367     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 368     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 369     case ESPIPE:    set_win32_error( ERROR_SEEK ); break;
 370     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 371     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 372     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 373 #ifdef EOVERFLOW
 374     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 375 #endif
 376     default:        perror("file_set_error"); set_win32_error( ERROR_UNKNOWN ); break;
 377     }
 378 }
 379
 380 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 381 {
 382     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 383 }
 384
 385 int get_file_unix_fd( struct file *file )
 386 {
 387     return get_unix_fd( file->fd );
 388 }
 389
 390 /* extend a file beyond the current end of file */
 391 static int extend_file( struct file *file, off_t size )
 392 {
 393     static const char zero;
 394     int unix_fd = get_file_unix_fd( file );
 395
 396     /* extend the file one byte beyond the requested size and then truncate it */
 397     /* this should work around ftruncate implementations that can't extend files */
 398     if ((lseek( unix_fd, size, SEEK_SET ) != -1) &&
 399         (write( unix_fd, &zero, 1 ) != -1))
 400     {
 401         ftruncate( unix_fd, size );
 402         return 1;
 403     }
 404     file_set_error();
 405     return 0;
 406 }
 407
 408 /* truncate file at current position */
 409 static int truncate_file( struct file *file )
 410 {
 411     int ret = 0;
 412     int unix_fd = get_file_unix_fd( file );
 413     off_t pos = lseek( unix_fd, 0, SEEK_CUR );
 414     off_t eof = lseek( unix_fd, 0, SEEK_END );
 415
 416     if (eof < pos) ret = extend_file( file, pos );
 417     else
 418     {
 419         if (ftruncate( unix_fd, pos ) != -1) ret = 1;
 420         else file_set_error();
 421     }
 422     lseek( unix_fd, pos, SEEK_SET );  /* restore file pos */
 423     return ret;
 424 }
 425
 426 /* try to grow the file to the specified size */
 427 int grow_file( struct file *file, int size_high, int size_low )
 428 {
 429     int ret = 0;
 430     struct stat st;
 431     int unix_fd = get_file_unix_fd( file );
 432     off_t old_pos, size = size_low + (((off_t)size_high)<<32);
 433
 434     if (fstat( unix_fd, &st ) == -1)
 435     {
 436         file_set_error();
 437         return 0;
 438     }
 439     if (st.st_size >= size) return 1;  /* already large enough */
 440     old_pos = lseek( unix_fd, 0, SEEK_CUR );  /* save old pos */
 441     ret = extend_file( file, size );
 442     lseek( unix_fd, old_pos, SEEK_SET );  /* restore file pos */
 443     return ret;
 444 }
 445
 446 /* create a file */
 447 DECL_HANDLER(create_file)
 448 {
 449     struct object *file;
 450
 451     reply->handle = 0;
 452     if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
 453                              req->sharing, req->create, req->options, req->attrs )))
 454     {
 455         reply->handle = alloc_handle( current->process, file, req->access, req->inherit );
 456         release_object( file );
 457     }
 458 }
 459
 460 /* allocate a file handle for a Unix fd */
 461 DECL_HANDLER(alloc_file_handle)
 462 {
 463     struct file *file;
 464     int fd;
 465
 466     reply->handle = 0;
 467     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 468     {
 469         set_error( STATUS_INVALID_HANDLE );
 470         return;
 471     }
 472     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 473     {
 474         reply->handle = alloc_handle( current->process, file, req->access, req->inherit );
 475         release_object( file );
 476     }
 477 }
 478
 479 /* truncate (or extend) a file */
 480 DECL_HANDLER(truncate_file)
 481 {
 482     struct file *file;
 483
 484     if ((file = get_file_obj( current->process, req->handle, GENERIC_WRITE )))
 485     {
 486         truncate_file( file );
 487         release_object( file );
 488     }
 489 }
 490
 491 /* lock a region of a file */
 492 DECL_HANDLER(lock_file)
 493 {
 494     struct file *file;
 495     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 496     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 497
 498     if ((file = get_file_obj( current->process, req->handle, 0 )))
 499     {
 500         reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
 501         reply->overlapped = is_overlapped( file );
 502         release_object( file );
 503     }
 504 }
 505
 506 /* unlock a region of a file */
 507 DECL_HANDLER(unlock_file)
 508 {
 509     struct file *file;
 510     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 511     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 512
 513     if ((file = get_file_obj( current->process, req->handle, 0 )))
 514     {
 515         unlock_fd( file->fd, offset, count );
 516         release_object( file );
 517     }
 518 }