// 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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#ifndef CRASHPAD_UTIL_POSIX_CLOSE_STDIO_H_
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#define CRASHPAD_UTIL_POSIX_CLOSE_STDIO_H_
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namespace crashpad {
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//! \brief Closes `stdin` and `stdout` by opening `/dev/null` over them.
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//!
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//! It is normally inadvisable to `close()` the three standard input/output
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//! streams, because they occupy special file descriptors. Closing them outright
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//! could result in their file descriptors being reused. This causes problems
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//! for library code (including the standard library) that expects these file
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//! descriptors to have special meaning.
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//!
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//! This function discards the standard input and standard output streams by
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//! opening `/dev/null` and assigning it to their file descriptors, closing
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//! whatever had been at those file descriptors previously.
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//!
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//! `stderr`, the standard error stream, is not closed. It is often useful to
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//! retain the ability to send diagnostic messages to the standard error stream.
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//!
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//! \note This function can only maintain its guarantees in a single-threaded
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//! process, or in situations where the caller has control of all threads in
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//! the process.
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void CloseStdinAndStdout();
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_POSIX_CLOSE_STDIO_H_
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