1 /* Copyright (C) 1997,1998,1999,2000,2001,2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 #include <sys/types.h>
25 #include <sys/syscall.h>
27 #include "kernel-features.h"
29 #ifdef __NR_ftruncate64
30 #ifndef __ASSUME_TRUNCATE64_SYSCALL
31 /* The variable is shared between all wrappers around *truncate64 calls. */
32 extern int __have_no_truncate64
;
36 /* Truncate the file FD refers to to LENGTH bytes. */
38 __ftruncate64 (int fd
, off64_t length
)
40 #ifndef __ASSUME_TRUNCATE64_SYSCALL
41 if (! __have_no_truncate64
)
44 unsigned int low
= length
& 0xffffffff;
45 unsigned int high
= length
>> 32;
46 #ifndef __ASSUME_TRUNCATE64_SYSCALL
47 int saved_errno
= errno
;
49 int result
= INLINE_SYSCALL (ftruncate64
, 3, fd
,
50 __LONG_LONG_PAIR (high
, low
));
51 #ifndef __ASSUME_TRUNCATE64_SYSCALL
52 if (result
!= -1 || errno
!= ENOSYS
)
56 #ifndef __ASSUME_TRUNCATE64_SYSCALL
57 __set_errno (saved_errno
);
58 __have_no_truncate64
= 1;
62 #ifndef __ASSUME_TRUNCATE64_SYSCALL
63 if ((off_t
) length
!= length
)
68 return __ftruncate (fd
, (off_t
) length
);
71 weak_alias (__ftruncate64
, ftruncate64
)
74 /* Use the generic implementation. */
75 # include <sysdeps/generic/ftruncate64.c>