Apache Mesos
ftruncate.hpp
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1 // Licensed under the Apache License, Version 2.0 (the "License");
2 // you may not use this file except in compliance with the License.
3 // You may obtain a copy of the License at
4 //
5 // http://www.apache.org/licenses/LICENSE-2.0
6 //
7 // Unless required by applicable law or agreed to in writing, software
8 // distributed under the License is distributed on an "AS IS" BASIS,
9 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
10 // See the License for the specific language governing permissions and
11 // limitations under the License.
12 
13 #ifndef __STOUT_OS_WINDOWS_FTRUNCATE_HPP__
14 #define __STOUT_OS_WINDOWS_FTRUNCATE_HPP__
15 
16 #include <io.h>
17 
18 #include <stout/error.hpp>
19 #include <stout/nothing.hpp>
20 #include <stout/stringify.hpp>
21 #include <stout/try.hpp>
22 
23 #include <stout/os/windows/fd.hpp>
24 
25 
26 namespace os {
27 
28 // Identical in functionality to POSIX standard `ftruncate`.
29 inline Try<Nothing> ftruncate(const WindowsFD& fd, __int64 length)
30 {
31  if (::_chsize_s(fd.crt(), length) != 0) {
32  return ErrnoError(
33  "Failed to truncate file at file descriptor '" + stringify(fd) + "' to " +
34  stringify(length) + " bytes.");
35  }
36 
37  return Nothing();
38 }
39 
40 } // namespace os {
41 
42 #endif // __STOUT_OS_WINDOWS_FTRUNCATE_HPP__
Definition: nothing.hpp:16
Definition: fd.hpp:47
Definition: try.hpp:34
Definition: errorbase.hpp:49
int crt() const
Definition: fd.hpp:97
std::string stringify(int flags)
Try< Nothing > ftruncate(int fd, off_t length)
Definition: ftruncate.hpp:26