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. 28 int ftruncate(int filedes, off_t length) { 29 return ftruncate64(filedes, length); 30 } 31 #endif // !defined(__LP64__) 32
