[flang] Use object before converts in fir.dispatch (#68589)
[llvm-project.git] / libc / src / unistd / linux / truncate.cpp
blob0120cc738a92165e07e24c05d0cd1c0b072177da
1 //===-- Linux implementation of truncate ----------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
9 #include "src/unistd/truncate.h"
11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
12 #include "src/__support/common.h"
13 #include "src/errno/libc_errno.h"
15 #include <stdint.h> // For uint64_t.
16 #include <sys/syscall.h> // For syscall numbers.
17 #include <unistd.h>
19 namespace LIBC_NAMESPACE {
21 LLVM_LIBC_FUNCTION(int, truncate, (const char *path, off_t len)) {
22 #ifdef SYS_truncate
23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_truncate, path, len);
24 #elif defined(SYS_truncate64)
25 // Same as truncate but can handle large offsets
26 static_assert(sizeof(off_t) == 8);
27 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_truncate64, path, (long)len,
28 (long)(((uint64_t)(len)) >> 32));
29 #else
30 #error "truncate and truncate64 syscalls not available."
31 #endif
32 if (ret < 0) {
33 libc_errno = -ret;
34 return -1;
36 return 0;
39 } // namespace LIBC_NAMESPACE