| /* Copyright (C) 1997-2000,2003,2004,2005,2006 |
| 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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, 3, CHECK_STRING (path), |
| __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 |