mirror of
https://github.com/chromium/crashpad.git
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52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
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// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/posix/close_stdio.h"
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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#include "base/files/scoped_file.h"
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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namespace crashpad {
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namespace {
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void CloseStdioStream(int desired_fd, int oflag) {
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base::ScopedFD fd(HANDLE_EINTR(open(_PATH_DEVNULL, oflag)));
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if (fd == desired_fd) {
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// Weird, but play along.
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ignore_result(fd.release());
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} else {
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PCHECK(fd.get() >= 0) << "open";
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PCHECK(HANDLE_EINTR(dup2(fd.get(), desired_fd)) != -1) << "dup2";
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fd.reset();
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}
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}
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} // namespace
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void CloseStdinAndStdout() {
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// Open /dev/null for stdin and stdout separately, so that it can be opened
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// with the correct mode each time. This ensures that attempts to write to
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// stdin or read from stdout fail with EBADF.
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CloseStdioStream(STDIN_FILENO, O_RDONLY);
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CloseStdioStream(STDOUT_FILENO, O_WRONLY);
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}
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} // namespace crashpad
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