2 * Server-side file management
4 * Copyright (C) 1998 Alexandre Julliard
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.
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.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 #include "wine/port.h"
31 #ifdef HAVE_SYS_ERRNO_H
32 #include <sys/errno.h>
36 #include <sys/types.h>
47 #define WIN32_NO_STATUS
60 struct object obj
; /* object header */
61 struct fd
*fd
; /* file descriptor for this file */
62 unsigned int access
; /* file access (FILE_READ_DATA etc.) */
63 mode_t mode
; /* file stat.st_mode */
64 uid_t uid
; /* file stat.st_uid */
67 static unsigned int generic_file_map_access( unsigned int access
);
69 static void file_dump( struct object
*obj
, int verbose
);
70 static struct fd
*file_get_fd( struct object
*obj
);
71 static struct security_descriptor
*file_get_sd( struct object
*obj
);
72 static int file_set_sd( struct object
*obj
, const struct security_descriptor
*sd
, unsigned int set_info
);
73 static void file_destroy( struct object
*obj
);
75 static int file_get_poll_events( struct fd
*fd
);
76 static void file_flush( struct fd
*fd
, struct event
**event
);
77 static enum server_fd_type
file_get_fd_type( struct fd
*fd
);
78 static mode_t
sd_to_mode( const struct security_descriptor
*sd
, const SID
*owner
);
80 static const struct object_ops file_ops
=
82 sizeof(struct file
), /* size */
84 add_queue
, /* add_queue */
85 remove_queue
, /* remove_queue */
86 default_fd_signaled
, /* signaled */
87 no_satisfied
, /* satisfied */
88 no_signal
, /* signal */
89 file_get_fd
, /* get_fd */
90 default_fd_map_access
, /* map_access */
91 file_get_sd
, /* get_sd */
92 file_set_sd
, /* set_sd */
93 no_lookup_name
, /* lookup_name */
94 no_open_file
, /* open_file */
95 fd_close_handle
, /* close_handle */
96 file_destroy
/* destroy */
99 static const struct fd_ops file_fd_ops
=
101 file_get_poll_events
, /* get_poll_events */
102 default_poll_event
, /* poll_event */
103 file_flush
, /* flush */
104 file_get_fd_type
, /* get_fd_type */
105 default_fd_ioctl
, /* ioctl */
106 default_fd_queue_async
, /* queue_async */
107 default_fd_reselect_async
, /* reselect_async */
108 default_fd_cancel_async
/* cancel_async */
111 static inline int is_overlapped( const struct file
*file
)
113 return !(get_fd_options( file
->fd
) & (FILE_SYNCHRONOUS_IO_ALERT
| FILE_SYNCHRONOUS_IO_NONALERT
));
116 /* create a file from a file descriptor */
117 /* if the function fails the fd is closed */
118 static struct file
*create_file_for_fd( int fd
, unsigned int access
, unsigned int sharing
)
123 if (fstat( fd
, &st
) == -1)
129 if ((file
= alloc_object( &file_ops
)))
131 file
->mode
= st
.st_mode
;
132 file
->access
= default_fd_map_access( &file
->obj
, access
);
133 if (!(file
->fd
= create_anonymous_fd( &file_fd_ops
, fd
, &file
->obj
,
134 FILE_SYNCHRONOUS_IO_NONALERT
)))
136 release_object( file
);
143 static struct object
*create_file_obj( struct fd
*fd
, unsigned int access
, mode_t mode
)
145 struct file
*file
= alloc_object( &file_ops
);
147 if (!file
) return NULL
;
148 file
->access
= access
;
152 set_fd_user( fd
, &file_fd_ops
, &file
->obj
);
156 static struct object
*create_file( const char *nameptr
, data_size_t len
, unsigned int access
,
157 unsigned int sharing
, int create
, unsigned int options
,
158 unsigned int attrs
, const struct security_descriptor
*sd
)
160 struct object
*obj
= NULL
;
166 if (!(name
= mem_alloc( len
+ 1 ))) return NULL
;
167 memcpy( name
, nameptr
, len
);
172 case FILE_CREATE
: flags
= O_CREAT
| O_EXCL
; break;
173 case FILE_OVERWRITE_IF
: /* FIXME: the difference is whether we trash existing attr or not */
174 case FILE_SUPERSEDE
: flags
= O_CREAT
| O_TRUNC
; break;
175 case FILE_OPEN
: flags
= 0; break;
176 case FILE_OPEN_IF
: flags
= O_CREAT
; break;
177 case FILE_OVERWRITE
: flags
= O_TRUNC
; break;
178 default: set_error( STATUS_INVALID_PARAMETER
); goto done
;
183 const SID
*owner
= sd_get_owner( sd
);
185 owner
= token_get_user( current
->process
->token
);
186 mode
= sd_to_mode( sd
, owner
);
189 mode
= (attrs
& FILE_ATTRIBUTE_READONLY
) ? 0444 : 0666;
192 (!strcasecmp( name
+ len
- 4, ".exe" ) || !strcasecmp( name
+ len
- 4, ".com" )))
202 access
= generic_file_map_access( access
);
204 /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
205 fd
= open_fd( name
, flags
| O_NONBLOCK
| O_LARGEFILE
, &mode
, access
, sharing
, options
);
209 obj
= create_dir_obj( fd
);
210 else if (S_ISCHR(mode
) && is_serial_fd( fd
))
211 obj
= create_serial( fd
);
213 obj
= create_file_obj( fd
, access
, mode
);
215 release_object( fd
);
222 /* check if two file objects point to the same file */
223 int is_same_file( struct file
*file1
, struct file
*file2
)
225 return is_same_file_fd( file1
->fd
, file2
->fd
);
228 /* create a temp file for anonymous mappings */
229 struct file
*create_temp_file( int access
)
234 sprintf( tmpfn
, "anonmap.XXXXXX" ); /* create it in the server directory */
235 fd
= mkstemps( tmpfn
, 0 );
242 return create_file_for_fd( fd
, access
, 0 );
245 static void file_dump( struct object
*obj
, int verbose
)
247 struct file
*file
= (struct file
*)obj
;
248 assert( obj
->ops
== &file_ops
);
249 fprintf( stderr
, "File fd=%p\n", file
->fd
);
252 static int file_get_poll_events( struct fd
*fd
)
254 struct file
*file
= get_fd_user( fd
);
256 assert( file
->obj
.ops
== &file_ops
);
257 if (file
->access
& FILE_UNIX_READ_ACCESS
) events
|= POLLIN
;
258 if (file
->access
& FILE_UNIX_WRITE_ACCESS
) events
|= POLLOUT
;
262 static void file_flush( struct fd
*fd
, struct event
**event
)
264 int unix_fd
= get_unix_fd( fd
);
265 if (unix_fd
!= -1 && fsync( unix_fd
) == -1) file_set_error();
268 static enum server_fd_type
file_get_fd_type( struct fd
*fd
)
270 struct file
*file
= get_fd_user( fd
);
272 if (S_ISREG(file
->mode
) || S_ISBLK(file
->mode
)) return FD_TYPE_FILE
;
273 if (S_ISDIR(file
->mode
)) return FD_TYPE_DIR
;
277 static struct fd
*file_get_fd( struct object
*obj
)
279 struct file
*file
= (struct file
*)obj
;
280 assert( obj
->ops
== &file_ops
);
281 return (struct fd
*)grab_object( file
->fd
);
284 static unsigned int generic_file_map_access( unsigned int access
)
286 if (access
& GENERIC_READ
) access
|= FILE_GENERIC_READ
;
287 if (access
& GENERIC_WRITE
) access
|= FILE_GENERIC_WRITE
;
288 if (access
& GENERIC_EXECUTE
) access
|= FILE_GENERIC_EXECUTE
;
289 if (access
& GENERIC_ALL
) access
|= FILE_ALL_ACCESS
;
290 return access
& ~(GENERIC_READ
| GENERIC_WRITE
| GENERIC_EXECUTE
| GENERIC_ALL
);
293 static struct security_descriptor
*file_get_sd( struct object
*obj
)
295 struct file
*file
= (struct file
*)obj
;
298 struct security_descriptor
*sd
;
302 ACE_HEADER
*current_ace
;
303 ACCESS_ALLOWED_ACE
*aaa
;
307 const SID
*world_sid
= security_world_sid
;
308 const SID
*local_system_sid
= security_local_system_sid
;
310 assert( obj
->ops
== &file_ops
);
312 unix_fd
= get_file_unix_fd( file
);
314 if (unix_fd
== -1) return obj
->sd
;
316 if (fstat( unix_fd
, &st
) == -1)
319 /* mode and uid the same? if so, no need to re-generate security descriptor */
320 if (obj
->sd
&& (st
.st_mode
& (S_IRWXU
|S_IRWXO
)) == (file
->mode
& (S_IRWXU
|S_IRWXO
)) &&
321 (st
.st_uid
== file
->uid
))
324 user
= security_unix_uid_to_sid( st
.st_uid
);
325 group
= token_get_primary_group( current
->process
->token
);
327 dacl_size
= sizeof(ACL
) + FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
328 FIELD_OFFSET(SID
, SubAuthority
[local_system_sid
->SubAuthorityCount
]);
329 if (st
.st_mode
& S_IRWXU
)
330 dacl_size
+= FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
331 FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]);
332 if ((!(st
.st_mode
& S_IRUSR
) && (st
.st_mode
& (S_IRGRP
|S_IROTH
))) ||
333 (!(st
.st_mode
& S_IWUSR
) && (st
.st_mode
& (S_IWGRP
|S_IWOTH
))) ||
334 (!(st
.st_mode
& S_IXUSR
) && (st
.st_mode
& (S_IXGRP
|S_IXOTH
))))
335 dacl_size
+= FIELD_OFFSET(ACCESS_DENIED_ACE
, SidStart
) +
336 FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]);
337 if (st
.st_mode
& S_IRWXO
)
338 dacl_size
+= FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
339 FIELD_OFFSET(SID
, SubAuthority
[world_sid
->SubAuthorityCount
]);
341 sd
= mem_alloc( sizeof(struct security_descriptor
) +
342 FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]) +
343 FIELD_OFFSET(SID
, SubAuthority
[group
->SubAuthorityCount
]) +
345 if (!sd
) return obj
->sd
;
347 sd
->control
= SE_DACL_PRESENT
;
348 sd
->owner_len
= FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]);
349 sd
->group_len
= FIELD_OFFSET(SID
, SubAuthority
[group
->SubAuthorityCount
]);
351 sd
->dacl_len
= dacl_size
;
353 ptr
= (char *)(sd
+ 1);
354 memcpy( ptr
, user
, sd
->owner_len
);
355 ptr
+= sd
->owner_len
;
356 memcpy( ptr
, group
, sd
->group_len
);
357 ptr
+= sd
->group_len
;
360 dacl
->AclRevision
= ACL_REVISION
;
362 dacl
->AclSize
= dacl_size
;
363 dacl
->AceCount
= 1 + (st
.st_mode
& S_IRWXU
? 1 : 0) + (st
.st_mode
& S_IRWXO
? 1 : 0);
364 if ((!(st
.st_mode
& S_IRUSR
) && (st
.st_mode
& (S_IRGRP
|S_IROTH
))) ||
365 (!(st
.st_mode
& S_IWUSR
) && (st
.st_mode
& (S_IWGRP
|S_IWOTH
))) ||
366 (!(st
.st_mode
& S_IXUSR
) && (st
.st_mode
& (S_IXGRP
|S_IXOTH
))))
370 /* always give FILE_ALL_ACCESS for Local System */
371 aaa
= (ACCESS_ALLOWED_ACE
*)(dacl
+ 1);
372 current_ace
= &aaa
->Header
;
373 aaa
->Header
.AceType
= ACCESS_ALLOWED_ACE_TYPE
;
374 aaa
->Header
.AceFlags
= 0;
375 aaa
->Header
.AceSize
= FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
376 FIELD_OFFSET(SID
, SubAuthority
[local_system_sid
->SubAuthorityCount
]);
377 aaa
->Mask
= FILE_ALL_ACCESS
;
378 sid
= (SID
*)&aaa
->SidStart
;
379 memcpy( sid
, local_system_sid
, FIELD_OFFSET(SID
, SubAuthority
[local_system_sid
->SubAuthorityCount
]) );
381 if (st
.st_mode
& S_IRWXU
)
383 /* appropriate access rights for the user */
384 aaa
= (ACCESS_ALLOWED_ACE
*)ace_next( current_ace
);
385 current_ace
= &aaa
->Header
;
386 aaa
->Header
.AceType
= ACCESS_ALLOWED_ACE_TYPE
;
387 aaa
->Header
.AceFlags
= 0;
388 aaa
->Header
.AceSize
= FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
389 FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]);
390 aaa
->Mask
= WRITE_DAC
| WRITE_OWNER
;
391 if (st
.st_mode
& S_IRUSR
)
392 aaa
->Mask
|= FILE_GENERIC_READ
;
393 if (st
.st_mode
& S_IWUSR
)
394 aaa
->Mask
|= FILE_GENERIC_WRITE
| DELETE
;
395 if (st
.st_mode
& S_IXUSR
)
396 aaa
->Mask
|= FILE_GENERIC_EXECUTE
;
397 sid
= (SID
*)&aaa
->SidStart
;
398 memcpy( sid
, user
, FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]) );
400 if ((!(st
.st_mode
& S_IRUSR
) && (st
.st_mode
& (S_IRGRP
|S_IROTH
))) ||
401 (!(st
.st_mode
& S_IWUSR
) && (st
.st_mode
& (S_IWGRP
|S_IWOTH
))) ||
402 (!(st
.st_mode
& S_IXUSR
) && (st
.st_mode
& (S_IXGRP
|S_IXOTH
))))
404 /* deny just in case the user is a member of the group */
405 ACCESS_DENIED_ACE
*ada
= (ACCESS_DENIED_ACE
*)ace_next( current_ace
);
406 current_ace
= &ada
->Header
;
407 ada
->Header
.AceType
= ACCESS_DENIED_ACE_TYPE
;
408 ada
->Header
.AceFlags
= 0;
409 ada
->Header
.AceSize
= FIELD_OFFSET(ACCESS_DENIED_ACE
, SidStart
) +
410 FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]);
412 if (!(st
.st_mode
& S_IRUSR
) && (st
.st_mode
& (S_IRGRP
|S_IROTH
)))
413 ada
->Mask
|= FILE_GENERIC_READ
;
414 if (!(st
.st_mode
& S_IWUSR
) && (st
.st_mode
& (S_IWGRP
|S_IROTH
)))
415 ada
->Mask
|= FILE_GENERIC_WRITE
| DELETE
;
416 if (!(st
.st_mode
& S_IXUSR
) && (st
.st_mode
& (S_IXGRP
|S_IXOTH
)))
417 ada
->Mask
|= FILE_GENERIC_EXECUTE
;
418 ada
->Mask
&= ~STANDARD_RIGHTS_ALL
; /* never deny standard rights */
419 sid
= (SID
*)&ada
->SidStart
;
420 memcpy( sid
, user
, FIELD_OFFSET(SID
, SubAuthority
[user
->SubAuthorityCount
]) );
422 if (st
.st_mode
& S_IRWXO
)
424 /* appropriate access rights for Everyone */
425 aaa
= (ACCESS_ALLOWED_ACE
*)ace_next( current_ace
);
426 current_ace
= &aaa
->Header
;
427 aaa
->Header
.AceType
= ACCESS_ALLOWED_ACE_TYPE
;
428 aaa
->Header
.AceFlags
= 0;
429 aaa
->Header
.AceSize
= FIELD_OFFSET(ACCESS_ALLOWED_ACE
, SidStart
) +
430 FIELD_OFFSET(SID
, SubAuthority
[world_sid
->SubAuthorityCount
]);
432 if (st
.st_mode
& S_IROTH
)
433 aaa
->Mask
|= FILE_GENERIC_READ
;
434 if (st
.st_mode
& S_IWOTH
)
435 aaa
->Mask
|= FILE_GENERIC_WRITE
| DELETE
;
436 if (st
.st_mode
& S_IXOTH
)
437 aaa
->Mask
|= FILE_GENERIC_EXECUTE
;
438 sid
= (SID
*)&aaa
->SidStart
;
439 memcpy( sid
, world_sid
, FIELD_OFFSET(SID
, SubAuthority
[world_sid
->SubAuthorityCount
]) );
442 file
->mode
= st
.st_mode
;
443 file
->uid
= st
.st_uid
;
449 static mode_t
sd_to_mode( const struct security_descriptor
*sd
, const SID
*owner
)
452 mode_t denied_mode
= 0;
454 const ACL
*dacl
= sd_get_dacl( sd
, &present
);
457 const ACE_HEADER
*ace
= (const ACE_HEADER
*)(dacl
+ 1);
459 for (i
= 0; i
< dacl
->AceCount
; i
++, ace
= ace_next( ace
))
461 const ACCESS_ALLOWED_ACE
*aa_ace
;
462 const ACCESS_DENIED_ACE
*ad_ace
;
465 if (ace
->AceFlags
& INHERIT_ONLY_ACE
) continue;
467 switch (ace
->AceType
)
469 case ACCESS_DENIED_ACE_TYPE
:
470 ad_ace
= (const ACCESS_DENIED_ACE
*)ace
;
471 sid
= (const SID
*)&ad_ace
->SidStart
;
472 if (security_equal_sid( sid
, security_world_sid
))
474 unsigned int access
= generic_file_map_access( ad_ace
->Mask
);
475 if (access
& FILE_READ_DATA
)
476 denied_mode
|= S_IRUSR
|S_IRGRP
|S_IROTH
;
477 if (access
& FILE_WRITE_DATA
)
478 denied_mode
|= S_IWUSR
|S_IWGRP
|S_IWOTH
;
479 if (access
& FILE_EXECUTE
)
480 denied_mode
|= S_IXUSR
|S_IXGRP
|S_IXOTH
;
482 else if (security_equal_sid( sid
, owner
))
484 unsigned int access
= generic_file_map_access( ad_ace
->Mask
);
485 if (access
& FILE_READ_DATA
)
486 denied_mode
|= S_IRUSR
;
487 if (access
& FILE_WRITE_DATA
)
488 denied_mode
|= S_IWUSR
;
489 if (access
& FILE_EXECUTE
)
490 denied_mode
|= S_IXUSR
;
493 case ACCESS_ALLOWED_ACE_TYPE
:
494 aa_ace
= (const ACCESS_ALLOWED_ACE
*)ace
;
495 sid
= (const SID
*)&aa_ace
->SidStart
;
496 if (security_equal_sid( sid
, security_world_sid
))
498 unsigned int access
= generic_file_map_access( aa_ace
->Mask
);
499 if (access
& FILE_READ_DATA
)
500 new_mode
|= S_IRUSR
|S_IRGRP
|S_IROTH
;
501 if (access
& FILE_WRITE_DATA
)
502 new_mode
|= S_IWUSR
|S_IWGRP
|S_IWOTH
;
503 if (access
& FILE_EXECUTE
)
504 new_mode
|= S_IXUSR
|S_IXGRP
|S_IXOTH
;
506 else if (security_equal_sid( sid
, owner
))
508 unsigned int access
= generic_file_map_access( aa_ace
->Mask
);
509 if (access
& FILE_READ_DATA
)
511 if (access
& FILE_WRITE_DATA
)
513 if (access
& FILE_EXECUTE
)
521 /* no ACL means full access rights to anyone */
522 new_mode
= S_IRWXU
| S_IRWXO
;
524 return new_mode
& ~denied_mode
;
527 static int file_set_sd( struct object
*obj
, const struct security_descriptor
*sd
,
528 unsigned int set_info
)
530 struct file
*file
= (struct file
*)obj
;
535 assert( obj
->ops
== &file_ops
);
537 unix_fd
= get_file_unix_fd( file
);
539 if (unix_fd
== -1) return 1;
541 if (set_info
& OWNER_SECURITY_INFORMATION
)
543 owner
= sd_get_owner( sd
);
546 set_error( STATUS_INVALID_SECURITY_DESCR
);
549 if (!obj
->sd
|| !security_equal_sid( owner
, sd_get_owner( obj
->sd
) ))
551 /* FIXME: get Unix uid and call fchown */
555 owner
= sd_get_owner( obj
->sd
);
557 owner
= token_get_user( current
->process
->token
);
559 /* group and sacl not supported */
561 if (set_info
& DACL_SECURITY_INFORMATION
)
563 /* keep the bits that we don't map to access rights in the ACL */
564 mode
= file
->mode
& (S_ISUID
|S_ISGID
|S_ISVTX
|S_IRWXG
);
565 mode
|= sd_to_mode( sd
, owner
);
567 if (file
->mode
!= mode
)
569 if (fchmod( unix_fd
, mode
) == -1)
581 static void file_destroy( struct object
*obj
)
583 struct file
*file
= (struct file
*)obj
;
584 assert( obj
->ops
== &file_ops
);
586 if (file
->fd
) release_object( file
->fd
);
589 /* set the last error depending on errno */
590 void file_set_error(void)
595 case EAGAIN
: set_error( STATUS_SHARING_VIOLATION
); break;
596 case EBADF
: set_error( STATUS_INVALID_HANDLE
); break;
597 case ENOSPC
: set_error( STATUS_DISK_FULL
); break;
600 case EPERM
: set_error( STATUS_ACCESS_DENIED
); break;
601 case EROFS
: set_error( STATUS_MEDIA_WRITE_PROTECTED
); break;
602 case EBUSY
: set_error( STATUS_FILE_LOCK_CONFLICT
); break;
603 case ENOENT
: set_error( STATUS_NO_SUCH_FILE
); break;
604 case EISDIR
: set_error( STATUS_FILE_IS_A_DIRECTORY
); break;
606 case EMFILE
: set_error( STATUS_TOO_MANY_OPENED_FILES
); break;
607 case EEXIST
: set_error( STATUS_OBJECT_NAME_COLLISION
); break;
608 case EINVAL
: set_error( STATUS_INVALID_PARAMETER
); break;
609 case ESPIPE
: set_error( STATUS_ILLEGAL_FUNCTION
); break;
610 case ENOTEMPTY
: set_error( STATUS_DIRECTORY_NOT_EMPTY
); break;
611 case EIO
: set_error( STATUS_ACCESS_VIOLATION
); break;
612 case ENOTDIR
: set_error( STATUS_NOT_A_DIRECTORY
); break;
613 case EFBIG
: set_error( STATUS_SECTION_TOO_BIG
); break;
614 case ENODEV
: set_error( STATUS_NO_SUCH_DEVICE
); break;
615 case ENXIO
: set_error( STATUS_NO_SUCH_DEVICE
); break;
617 case EOVERFLOW
: set_error( STATUS_INVALID_PARAMETER
); break;
620 perror("wineserver: file_set_error() can't map error");
621 set_error( STATUS_UNSUCCESSFUL
);
626 struct file
*get_file_obj( struct process
*process
, obj_handle_t handle
, unsigned int access
)
628 return (struct file
*)get_handle_obj( process
, handle
, access
, &file_ops
);
631 int get_file_unix_fd( struct file
*file
)
633 return get_unix_fd( file
->fd
);
636 struct file
*grab_file_unless_removable( struct file
*file
)
638 if (is_fd_removable( file
->fd
)) return NULL
;
639 return (struct file
*)grab_object( file
);
642 /* extend a file beyond the current end of file */
643 static int extend_file( struct file
*file
, file_pos_t new_size
)
645 static const char zero
;
646 int unix_fd
= get_file_unix_fd( file
);
647 off_t size
= new_size
;
649 if (unix_fd
== -1) return 0;
651 if (sizeof(new_size
) > sizeof(size
) && size
!= new_size
)
653 set_error( STATUS_INVALID_PARAMETER
);
656 /* extend the file one byte beyond the requested size and then truncate it */
657 /* this should work around ftruncate implementations that can't extend files */
658 if (pwrite( unix_fd
, &zero
, 1, size
) != -1)
660 ftruncate( unix_fd
, size
);
667 /* try to grow the file to the specified size */
668 int grow_file( struct file
*file
, file_pos_t size
)
671 int unix_fd
= get_file_unix_fd( file
);
673 if (unix_fd
== -1) return 0;
675 if (fstat( unix_fd
, &st
) == -1)
680 if (st
.st_size
>= size
) return 1; /* already large enough */
681 return extend_file( file
, size
);
685 DECL_HANDLER(create_file
)
688 const struct object_attributes
*objattr
= get_req_data();
689 const struct security_descriptor
*sd
;
691 data_size_t name_len
;
695 if (!objattr_is_valid( objattr
, get_req_data_size() ))
697 /* name is transferred in the unix codepage outside of the objattr structure */
698 if (objattr
->name_len
)
700 set_error( STATUS_INVALID_PARAMETER
);
704 sd
= objattr
->sd_len
? (const struct security_descriptor
*)(objattr
+ 1) : NULL
;
706 name
= (const char *)get_req_data() + sizeof(*objattr
) + objattr
->sd_len
;
707 name_len
= get_req_data_size() - sizeof(*objattr
) - objattr
->sd_len
;
710 if ((file
= create_file( name
, name_len
, req
->access
,
711 req
->sharing
, req
->create
, req
->options
,
714 reply
->handle
= alloc_handle( current
->process
, file
, req
->access
, req
->attributes
);
715 release_object( file
);
719 /* allocate a file handle for a Unix fd */
720 DECL_HANDLER(alloc_file_handle
)
726 if ((fd
= thread_get_inflight_fd( current
, req
->fd
)) == -1)
728 set_error( STATUS_INVALID_HANDLE
);
731 if ((file
= create_file_for_fd( fd
, req
->access
, FILE_SHARE_READ
| FILE_SHARE_WRITE
)))
733 reply
->handle
= alloc_handle( current
->process
, file
, req
->access
, req
->attributes
);
734 release_object( file
);
738 /* lock a region of a file */
739 DECL_HANDLER(lock_file
)
743 if ((file
= get_file_obj( current
->process
, req
->handle
, 0 )))
745 reply
->handle
= lock_fd( file
->fd
, req
->offset
, req
->count
, req
->shared
, req
->wait
);
746 reply
->overlapped
= is_overlapped( file
);
747 release_object( file
);
751 /* unlock a region of a file */
752 DECL_HANDLER(unlock_file
)
756 if ((file
= get_file_obj( current
->process
, req
->handle
, 0 )))
758 unlock_fd( file
->fd
, req
->offset
, req
->count
);
759 release_object( file
);