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// 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> OpenReplica(const FileDescriptor& master) {
return OpenReplica(master, O_NONBLOCK | O_RDWR | O_NOCTTY);
}
PosixErrorOr<FileDescriptor> OpenReplica(const FileDescriptor& master,
int flags) {
PosixErrorOr<int> n = ReplicaID(master);
if (!n.ok()) {
return PosixErrorOr<FileDescriptor>(n.error());
}
return Open(absl::StrCat("/dev/pts/", n.ValueOrDie()), flags);
}
PosixErrorOr<int> ReplicaID(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
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