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110eafe9a1
This function will be useful in upcoming non-test code. Because the first Crashpad client that wants a Crashpad handler will now be responsible for starting the handler process, this will prevent file descriptors from leaking to the handler process. R=rsesek@chromium.org Review URL: https://codereview.chromium.org/819483002
45 lines
2.1 KiB
C++
45 lines
2.1 KiB
C++
// 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_MULTIPLE_H_
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#define CRASHPAD_UTIL_POSIX_CLOSE_MULTIPLE_H_
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namespace crashpad {
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//! \brief Close multiple file descriptors or mark them close-on-exec.
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//!
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//! This is similar to the BSD/Solaris-style `closefrom()` routine, which closes
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//! all open file descriptors equal to or higher than its \a fd argument. This
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//! function must not be called while other threads are active. It is intended
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//! to be used in a child process created by `fork()`, prior to calling an
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//! `exec()`-family function. This guarantees that a (possibly untrustworthy)
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//! child process does not inherit file descriptors that it has no need for.
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//!
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//! Unlike the BSD function, this function may not close file descriptors
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//! immediately, but may instead mark them as close-on-exec. The actual behavior
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//! chosen is specific to the operating system. On Mac OS X, file descriptors
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//! are marked close-on-exec instead of being closed outright in order to avoid
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//! raising `EXC_GUARD` exceptions for guarded file descriptors that are
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//! protected against `close()`.
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//!
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//! \param[in] fd The lowest file descriptor to close or set as close-on-exec.
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//! \param[in] preserve_fd A file descriptor to preserve and not close (or set
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//! as close-on-exec), even if it is open and its value is greater than \a
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//! fd. To not preserve any file descriptor, pass `-1` for this parameter.
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void CloseMultipleNowOrOnExec(int fd, int preserve_fd);
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_POSIX_CLOSE_MULTIPLE_H_
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