1//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
8
9// <fstream>
10
11// basic_filebuf<charT,traits>* close();
12
13#include <fstream>
14#include <cassert>
15#if defined(__unix__)
16#include <fcntl.h>
17#include <unistd.h>
18#endif
19#include "test_macros.h"
20#include "platform_support.h"
21
22int main(int, char**)
23{
24 std::string temp = get_temp_file_name();
25 {
26 std::filebuf f;
27 assert(!f.is_open());
28 assert(f.open(temp.c_str(), std::ios_base::out) != 0);
29 assert(f.is_open());
30 assert(f.close() != nullptr);
31 assert(!f.is_open());
32 assert(f.close() == nullptr);
33 assert(!f.is_open());
34 }
35 // Starting with Android API 30+, Bionic's fdsan aborts a process that calls
36 // close() on a file descriptor tagged as belonging to something else (such
37 // as a FILE*).
38#if defined(__unix__) && !defined(__BIONIC__)
39 {
40 std::filebuf f;
41 assert(!f.is_open());
42 // Use open directly to get the file descriptor.
43 int fd = open(file: temp.c_str(), O_RDWR);
44 assert(fd >= 0);
45 // Use the internal method to create filebuf from the file descriptor.
46 assert(f.__open(fd, std::ios_base::out) != 0);
47 assert(f.is_open());
48 // Close the file descriptor directly to force filebuf::close to fail.
49 assert(close(fd) == 0);
50 // Ensure that filebuf::close handles the failure.
51 assert(f.close() == nullptr);
52 assert(!f.is_open());
53 assert(f.close() == nullptr);
54 }
55#endif
56 std::remove(filename: temp.c_str());
57
58 return 0;
59}
60

source code of libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/close.pass.cpp