46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
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// Copyright 2019 The gVisor Authors.
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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 "test/util/pty_util.h"
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#include <sys/ioctl.h>
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#include <termios.h>
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#include "test/util/file_descriptor.h"
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#include "test/util/posix_error.h"
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namespace gvisor {
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namespace testing {
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PosixErrorOr<FileDescriptor> OpenSlave(const FileDescriptor& master) {
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// Get pty index.
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int n;
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int ret = ioctl(master.get(), TIOCGPTN, &n);
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if (ret < 0) {
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return PosixError(errno, "ioctl(TIOCGPTN) failed");
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}
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// Unlock pts.
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int unlock = 0;
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ret = ioctl(master.get(), TIOCSPTLCK, &unlock);
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if (ret < 0) {
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return PosixError(errno, "ioctl(TIOSPTLCK) failed");
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}
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return Open(absl::StrCat("/dev/pts/", n), O_RDWR | O_NONBLOCK);
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}
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} // namespace testing
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} // namespace gvisor
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