1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <sys/cdefs.h>
19 #include <unistd.h>
20
21 #if !defined(__LP64__)
22 static_assert(sizeof(off_t) == 4,
23 "libc can't be built with _FILE_OFFSET_BITS=64.");
24
25 // The kernel's implementation of ftruncate uses an unsigned long for the length
26 // parameter, so it will not catch negative values. On the other hand
27 // ftruncate64 does check for this, so just forward the call.
ftruncate(int filedes,off_t length)28 int ftruncate(int filedes, off_t length) {
29 return ftruncate64(filedes, length);
30 }
31 #endif // !defined(__LP64__)
32