// Copyright 2019 The gVisor Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include "test/util/pty_util.h" #include <sys/ioctl.h> #include <termios.h> #include "test/util/file_descriptor.h" #include "test/util/posix_error.h" namespace gvisor { namespace testing { PosixErrorOr<FileDescriptor> OpenSlave(const FileDescriptor& master) { PosixErrorOr<int> n = SlaveID(master); if (!n.ok()) { return PosixErrorOr<FileDescriptor>(n.error()); } return Open(absl::StrCat("/dev/pts/", n.ValueOrDie()), O_RDWR | O_NONBLOCK); } PosixErrorOr<int> SlaveID(const FileDescriptor& master) { // Get pty index. int n; int ret = ioctl(master.get(), TIOCGPTN, &n); if (ret < 0) { return PosixError(errno, "ioctl(TIOCGPTN) failed"); } // Unlock pts. int unlock = 0; ret = ioctl(master.get(), TIOCSPTLCK, &unlock); if (ret < 0) { return PosixError(errno, "ioctl(TIOSPTLCK) failed"); } return n; } } // namespace testing } // namespace gvisor