projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| de96d148 DJ |
1 | /* Copyright (C) 1997-2000, 2003, 2004, 2005 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | ||
| 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. | |
| 8 | ||
| 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. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| de96d148 DJ |
17 | |
| 18 | #include <sys/types.h> | |
| 19 | #include <endian.h> | |
| 20 | #include <errno.h> | |
| 21 | #include <unistd.h> | |
| 22 | ||
| 23 | #include <sysdep.h> | |
| 24 | #include <sys/syscall.h> | |
| 25 | #include <bp-checks.h> | |
| 26 | ||
| 27 | #include "kernel-features.h" | |
| 28 | ||
| 29 | #ifdef __NR_truncate64 | |
| 30 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 31 | /* The variable is shared between all wrappers around *truncate64 calls. */ | |
| 32 | int __have_no_truncate64; | |
| 33 | #endif | |
| 34 | ||
| 35 | /* Truncate the file FD refers to to LENGTH bytes. */ | |
| 36 | int | |
| 37 | truncate64 (const char *path, off64_t length) | |
| 38 | { | |
| 39 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 40 | if (! __have_no_truncate64) | |
| 41 | #endif | |
| 42 | { | |
| 43 | unsigned int low = length & 0xffffffff; | |
| 44 | unsigned int high = length >> 32; | |
| 45 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 46 | int saved_errno = errno; | |
| 47 | #endif | |
| 48 | int result = INLINE_SYSCALL (truncate64, 4, CHECK_STRING (path), 0, | |
| 49 | __LONG_LONG_PAIR (high, low)); | |
| 50 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 51 | if (result != -1 || errno != ENOSYS) | |
| 52 | #endif | |
| 53 | return result; | |
| 54 | ||
| 55 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 56 | __set_errno (saved_errno); | |
| 57 | __have_no_truncate64 = 1; | |
| 58 | #endif | |
| 59 | } | |
| 60 | ||
| 61 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
| 62 | if ((off_t) length != length) | |
| 63 | { | |
| 64 | __set_errno (EINVAL); | |
| 65 | return -1; | |
| 66 | } | |
| 67 | return __truncate (path, (off_t) length); | |
| 68 | #endif | |
| 69 | } | |
| 70 | ||
| 71 | #else | |
| 72 | /* Use the generic implementation. */ | |
| 8e674bfd | 73 | # include <misc/truncate64.c> |
| de96d148 | 74 | #endif |