mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 22:30:12 +00:00
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/* Copyright (C) 1997,1998,1999,2000,2002,2003,2005,2006
|
|
Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/types.h>
|
|
#include <endian.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sysdep.h>
|
|
#include <sys/syscall.h>
|
|
#include <bp-checks.h>
|
|
|
|
#include <kernel-features.h>
|
|
|
|
#ifdef __NR_truncate64
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
/* The variable is shared between all wrappers around *truncate64 calls. */
|
|
int __have_no_truncate64;
|
|
#endif
|
|
|
|
/* Truncate the file FD refers to to LENGTH bytes. */
|
|
int
|
|
truncate64 (const char *path, off64_t length)
|
|
{
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
if (! __have_no_truncate64)
|
|
#endif
|
|
{
|
|
unsigned int low = length & 0xffffffff;
|
|
unsigned int high = length >> 32;
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
int saved_errno = errno;
|
|
#endif
|
|
int result = INLINE_SYSCALL (truncate64, 4, CHECK_STRING (path), 0,
|
|
__LONG_LONG_PAIR (high, low));
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
if (result != -1 || errno != ENOSYS)
|
|
#endif
|
|
return result;
|
|
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
__set_errno (saved_errno);
|
|
__have_no_truncate64 = 1;
|
|
#endif
|
|
}
|
|
|
|
#ifndef __ASSUME_TRUNCATE64_SYSCALL
|
|
if ((off_t) length != length)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
return truncate (path, (off_t) length);
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
/* Use the generic implementation. */
|
|
# include <misc/truncate64.c>
|
|
#endif
|