cmUVStreambuf: Add std::streambuf implementation for uv_stream_t

This will allow std::istream/std::ostream-based interaction with
processes spawned by libuv.

4 files changed, 680 insertions, 1 deletions

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 6fa046c..01c6cd7 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -388,6 +388,7 @@ set(SRCS
   cmUuid.cxx
   cmUVHandlePtr.cxx
   cmUVHandlePtr.h
+  cmUVStreambuf.h
   cmUVSignalHackRAII.h
   cmVariableWatch.cxx
   cmVariableWatch.h
diff --git a/Source/cmUVStreambuf.h b/Source/cmUVStreambuf.h
new file mode 100644
index 0000000..29e4fde
--- /dev/null
+++ b/Source/cmUVStreambuf.h
@@ -0,0 +1,219 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmUVStreambuf_h
+#define cmUVStreambuf_h
+
+#include "cmUVHandlePtr.h"
+
+#include "cm_uv.h"
+
+#include <algorithm>
+#include <cstring>
+#include <streambuf>
+#include <vector>
+
+/*
+ * This file is based on example code from:
+ *
+ * http://www.voidcn.com/article/p-vjnlygmc-gy.html
+ *
+ * The example code was distributed under the following license:
+ *
+ * Copyright 2007 Edd Dawson.
+ * Distributed under the Boost Software License, Version 1.0.
+ *
+ * Boost Software License - Version 1.0 - August 17th, 2003
+ *
+ * Permission is hereby granted, free of charge, to any person or organization
+ * obtaining a copy of the software and accompanying documentation covered by
+ * this license (the "Software") to use, reproduce, display, distribute,
+ * execute, and transmit the Software, and to prepare derivative works of the
+ * Software, and to permit third-parties to whom the Software is furnished to
+ * do so, all subject to the following:
+ *
+ * The copyright notices in the Software and this entire statement, including
+ * the above license grant, this restriction and the following disclaimer,
+ * must be included in all copies of the Software, in whole or in part, and
+ * all derivative works of the Software, unless such copies or derivative
+ * works are solely in the form of machine-executable object code generated by
+ * a source language processor.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+ * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+ * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+template <typename CharT, typename Traits = std::char_traits<CharT>>
+class cmBasicUVStreambuf : public std::basic_streambuf<CharT, Traits>
+{
+public:
+  cmBasicUVStreambuf(std::size_t bufSize = 256, std::size_t putBack = 8);
+  ~cmBasicUVStreambuf() override;
+
+  bool is_open() const;
+
+  cmBasicUVStreambuf* open(uv_stream_t* stream);
+
+  cmBasicUVStreambuf* close();
+
+protected:
+  typename cmBasicUVStreambuf::int_type underflow() override;
+  std::streamsize showmanyc() override;
+
+  // FIXME: Add write support
+
+private:
+  uv_stream_t* Stream = nullptr;
+  void* OldStreamData;
+  const std::size_t PutBack;
+  std::vector<CharT> InputBuffer;
+  bool EndOfFile;
+
+  void StreamReadStartStop();
+
+  void StreamRead(ssize_t nread);
+  void HandleAlloc(uv_buf_t* buf);
+};
+
+template <typename CharT, typename Traits>
+cmBasicUVStreambuf<CharT, Traits>::cmBasicUVStreambuf(std::size_t bufSize,
+                                                      std::size_t putBack)
+  : PutBack(std::max<std::size_t>(putBack, 1))
+  , InputBuffer(std::max<std::size_t>(this->PutBack, bufSize) + this->PutBack)
+{
+  this->close();
+}
+
+template <typename CharT, typename Traits>
+cmBasicUVStreambuf<CharT, Traits>::~cmBasicUVStreambuf()
+{
+  this->close();
+}
+
+template <typename CharT, typename Traits>
+bool cmBasicUVStreambuf<CharT, Traits>::is_open() const
+{
+  return this->Stream != nullptr;
+}
+
+template <typename CharT, typename Traits>
+cmBasicUVStreambuf<CharT, Traits>* cmBasicUVStreambuf<CharT, Traits>::open(
+  uv_stream_t* stream)
+{
+  this->close();
+  this->Stream = stream;
+  this->EndOfFile = false;
+  if (this->Stream) {
+    this->OldStreamData = this->Stream->data;
+    this->Stream->data = this;
+  }
+  this->StreamReadStartStop();
+  return this;
+}
+
+template <typename CharT, typename Traits>
+cmBasicUVStreambuf<CharT, Traits>* cmBasicUVStreambuf<CharT, Traits>::close()
+{
+  if (this->Stream) {
+    uv_read_stop(this->Stream);
+    this->Stream->data = this->OldStreamData;
+  }
+  this->Stream = nullptr;
+  CharT* readEnd = this->InputBuffer.data() + this->InputBuffer.size();
+  this->setg(readEnd, readEnd, readEnd);
+  return this;
+}
+
+template <typename CharT, typename Traits>
+typename cmBasicUVStreambuf<CharT, Traits>::int_type
+cmBasicUVStreambuf<CharT, Traits>::underflow()
+{
+  if (!this->is_open()) {
+    return Traits::eof();
+  }
+
+  if (this->gptr() < this->egptr()) {
+    return Traits::to_int_type(*this->gptr());
+  }
+
+  this->StreamReadStartStop();
+  while (this->in_avail() == 0) {
+    uv_run(this->Stream->loop, UV_RUN_ONCE);
+  }
+  if (this->in_avail() == -1) {
+    return Traits::eof();
+  }
+  return Traits::to_int_type(*this->gptr());
+}
+
+template <typename CharT, typename Traits>
+std::streamsize cmBasicUVStreambuf<CharT, Traits>::showmanyc()
+{
+  if (!this->is_open() || this->EndOfFile) {
+    return -1;
+  }
+  return 0;
+}
+
+template <typename CharT, typename Traits>
+void cmBasicUVStreambuf<CharT, Traits>::StreamReadStartStop()
+{
+  if (this->Stream) {
+    uv_read_stop(this->Stream);
+    if (this->gptr() >= this->egptr()) {
+      uv_read_start(
+        this->Stream,
+        [](uv_handle_t* handle, size_t /* unused */, uv_buf_t* buf) {
+          auto streambuf =
+            static_cast<cmBasicUVStreambuf<CharT, Traits>*>(handle->data);
+          streambuf->HandleAlloc(buf);
+        },
+        [](uv_stream_t* stream2, ssize_t nread, const uv_buf_t* /* unused */) {
+          auto streambuf =
+            static_cast<cmBasicUVStreambuf<CharT, Traits>*>(stream2->data);
+          streambuf->StreamRead(nread);
+        });
+    }
+  }
+}
+
+template <typename CharT, typename Traits>
+void cmBasicUVStreambuf<CharT, Traits>::HandleAlloc(uv_buf_t* buf)
+{
+  auto size = this->egptr() - this->gptr();
+  std::memmove(this->InputBuffer.data(), this->gptr(),
+               this->egptr() - this->gptr());
+  this->setg(this->InputBuffer.data(), this->InputBuffer.data(),
+             this->InputBuffer.data() + size);
+  buf->base = this->egptr();
+#ifdef _WIN32
+#  define BUF_LEN_TYPE ULONG
+#else
+#  define BUF_LEN_TYPE size_t
+#endif
+  buf->len = BUF_LEN_TYPE(
+    (this->InputBuffer.data() + this->InputBuffer.size() - this->egptr()) *
+    sizeof(CharT));
+#undef BUF_LEN_TYPE
+}
+
+template <typename CharT, typename Traits>
+void cmBasicUVStreambuf<CharT, Traits>::StreamRead(ssize_t nread)
+{
+  if (nread > 0) {
+    this->setg(this->eback(), this->gptr(),
+               this->egptr() + nread / sizeof(CharT));
+    uv_read_stop(this->Stream);
+  } else if (nread < 0 || nread == UV_EOF) {
+    this->EndOfFile = true;
+    uv_read_stop(this->Stream);
+  }
+}
+
+using cmUVStreambuf = cmBasicUVStreambuf<char>;
+
+#endif
diff --git a/Tests/CMakeLib/CMakeLists.txt b/Tests/CMakeLib/CMakeLists.txt
index 031ab01..e04bba2 100644
--- a/Tests/CMakeLib/CMakeLists.txt
+++ b/Tests/CMakeLib/CMakeLists.txt
@@ -16,9 +16,11 @@ set(CMakeLib_TESTS
   testXMLSafe.cxx
   testFindPackageCommand.cxx
   testUVRAII.cxx
+  testUVStreambuf.cxx
   )
 
 set(testRST_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
+set(testUVStreambuf_ARGS $<TARGET_FILE:cmake>)
 
 if(WIN32)
   list(APPEND CMakeLib_TESTS
@@ -43,7 +45,7 @@ target_link_libraries(testEncoding cmsys)
 
 foreach(testfile ${CMakeLib_TESTS})
   get_filename_component(test "${testfile}" NAME_WE)
-  add_test(CMakeLib.${test} CMakeLibTests ${test} ${${test}_ARGS})
+  add_test(NAME CMakeLib.${test} COMMAND CMakeLibTests ${test} ${${test}_ARGS})
 endforeach()
 
 if(TEST_CompileCommandOutput)
diff --git a/Tests/CMakeLib/testUVStreambuf.cxx b/Tests/CMakeLib/testUVStreambuf.cxx
new file mode 100644
index 0000000..39655f3
--- /dev/null
+++ b/Tests/CMakeLib/testUVStreambuf.cxx
@@ -0,0 +1,457 @@
+#include "cmUVStreambuf.h"
+
+#include "cmGetPipes.h"
+#include "cmUVHandlePtr.h"
+
+#include "cm_uv.h"
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <cstring>
+
+#include <stdint.h>
+
+#define TEST_STR_LINE_1 "This string must be exactly 128 characters long so"
+#define TEST_STR_LINE_2 "that we can test CMake's std::streambuf integration"
+#define TEST_STR_LINE_3 "with libuv's uv_stream_t."
+#define TEST_STR TEST_STR_LINE_1 "\n" TEST_STR_LINE_2 "\n" TEST_STR_LINE_3
+
+bool writeDataToStreamPipe(uv_loop_t& loop, cm::uv_pipe_ptr& inputPipe,
+                           char* outputData, unsigned int outputDataLength,
+                           const char* /* unused */)
+{
+  int err;
+
+  // Create the pipe
+  int pipeHandles[2];
+  if (cmGetPipes(pipeHandles) < 0) {
+    std::cout << "Could not open pipe" << std::endl;
+    return false;
+  }
+
+  cm::uv_pipe_ptr outputPipe;
+  inputPipe.init(loop, 0);
+  outputPipe.init(loop, 0);
+  uv_pipe_open(inputPipe, pipeHandles[0]);
+  uv_pipe_open(outputPipe, pipeHandles[1]);
+
+  // Write data for reading
+  uv_write_t writeReq;
+  struct WriteCallbackData
+  {
+    bool Finished = false;
+    int Status;
+  } writeData;
+  writeReq.data = &writeData;
+  uv_buf_t outputBuf;
+  outputBuf.base = outputData;
+  outputBuf.len = outputDataLength;
+  if ((err = uv_write(&writeReq, outputPipe, &outputBuf, 1,
+                      [](uv_write_t* req, int status) {
+                        auto data = static_cast<WriteCallbackData*>(req->data);
+                        data->Finished = true;
+                        data->Status = status;
+                      })) < 0) {
+    std::cout << "Could not write to pipe: " << uv_strerror(err) << std::endl;
+    return false;
+  }
+  while (!writeData.Finished) {
+    uv_run(&loop, UV_RUN_ONCE);
+  }
+  if (writeData.Status < 0) {
+    std::cout << "Status is " << uv_strerror(writeData.Status)
+              << ", should be 0" << std::endl;
+    return false;
+  }
+
+  return true;
+}
+
+bool writeDataToStreamProcess(uv_loop_t& loop, cm::uv_pipe_ptr& inputPipe,
+                              char* outputData, unsigned int /* unused */,
+                              const char* cmakeCommand)
+{
+  int err;
+
+  inputPipe.init(loop, 0);
+  std::vector<std::string> arguments = { cmakeCommand, "-E", "echo_append",
+                                         outputData };
+  std::vector<const char*> processArgs;
+  for (auto const& arg : arguments) {
+    processArgs.push_back(arg.c_str());
+  }
+  processArgs.push_back(nullptr);
+  std::vector<uv_stdio_container_t> stdio(3);
+  stdio[0].flags = UV_IGNORE;
+  stdio[0].data.stream = nullptr;
+  stdio[1].flags =
+    static_cast<uv_stdio_flags>(UV_CREATE_PIPE | UV_WRITABLE_PIPE);
+  stdio[1].data.stream = inputPipe;
+  stdio[2].flags = UV_IGNORE;
+  stdio[2].data.stream = nullptr;
+
+  struct ProcessExitData
+  {
+    bool Finished = false;
+    int64_t ExitStatus;
+    int TermSignal;
+  } exitData;
+  cm::uv_process_ptr process;
+  auto options = uv_process_options_t();
+  options.file = cmakeCommand;
+  options.args = const_cast<char**>(processArgs.data());
+  options.flags = UV_PROCESS_WINDOWS_HIDE;
+  options.stdio = stdio.data();
+  options.stdio_count = static_cast<int>(stdio.size());
+  options.exit_cb = [](uv_process_t* handle, int64_t exitStatus,
+                       int termSignal) {
+    auto data = static_cast<ProcessExitData*>(handle->data);
+    data->Finished = true;
+    data->ExitStatus = exitStatus;
+    data->TermSignal = termSignal;
+  };
+  if ((err = process.spawn(loop, options, &exitData)) < 0) {
+    std::cout << "Could not spawn process: " << uv_strerror(err) << std::endl;
+    return false;
+  }
+  while (!exitData.Finished) {
+    uv_run(&loop, UV_RUN_ONCE);
+  }
+  if (exitData.ExitStatus != 0) {
+    std::cout << "Process exit status is " << exitData.ExitStatus
+              << ", should be 0" << std::endl;
+    return false;
+  }
+  if (exitData.TermSignal != 0) {
+    std::cout << "Process term signal is " << exitData.TermSignal
+              << ", should be 0" << std::endl;
+    return false;
+  }
+
+  return true;
+}
+
+bool testUVStreambufRead(
+  bool (*cb)(uv_loop_t& loop, cm::uv_pipe_ptr& inputPipe, char* outputData,
+             unsigned int outputDataLength, const char* cmakeCommand),
+  const char* cmakeCommand)
+{
+  char outputData[] = TEST_STR;
+  bool success = false;
+  cm::uv_loop_ptr loop;
+  loop.init();
+  cm::uv_pipe_ptr inputPipe;
+  std::vector<char> inputData(128);
+  std::streamsize readLen;
+  std::string line;
+  cm::uv_timer_ptr timer;
+
+  // Create the streambuf
+  cmUVStreambuf inputBuf(64);
+  std::istream inputStream(&inputBuf);
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  // Perform first read test - read all the data
+  if (!cb(*loop, inputPipe, outputData, 128, cmakeCommand)) {
+    goto end;
+  }
+  inputBuf.open(inputPipe);
+  if (!inputBuf.is_open()) {
+    std::cout << "is_open() is false, should be true" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 128) {
+    std::cout << "sgetn() returned " << readLen << ", should be 128"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if (std::memcmp(inputData.data(), outputData, 128)) {
+    std::cout << "Read data does not match write data" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  inputData.assign(128, char{});
+  inputBuf.close();
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+
+  // Perform second read test - read some data and then close
+  if (!cb(*loop, inputPipe, outputData, 128, cmakeCommand)) {
+    goto end;
+  }
+  inputBuf.open(inputPipe);
+  if (!inputBuf.is_open()) {
+    std::cout << "is_open() is false, should be true" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 64)) != 64) {
+    std::cout << "sgetn() returned " << readLen << ", should be 64"
+              << std::endl;
+    goto end;
+  }
+  if (std::memcmp(inputData.data(), outputData, 64)) {
+    std::cout << "Read data does not match write data" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 8) {
+    std::cout << "in_avail() returned " << readLen << ", should be 8"
+              << std::endl;
+    goto end;
+  }
+  inputData.assign(128, char{});
+  inputBuf.close();
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  // Perform third read test - read line by line
+  if (!cb(*loop, inputPipe, outputData, 128, cmakeCommand)) {
+    goto end;
+  }
+  inputBuf.open(inputPipe);
+  if (!inputBuf.is_open()) {
+    std::cout << "is_open() is false, should be true" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  if (!std::getline(inputStream, line)) {
+    std::cout << "getline returned false, should be true" << std::endl;
+    goto end;
+  }
+  if (line != TEST_STR_LINE_1) {
+    std::cout << "Line 1 is \"" << line
+              << "\", should be \"" TEST_STR_LINE_1 "\"" << std::endl;
+    goto end;
+  }
+
+  if (!std::getline(inputStream, line)) {
+    std::cout << "getline returned false, should be true" << std::endl;
+    goto end;
+  }
+  if (line != TEST_STR_LINE_2) {
+    std::cout << "Line 2 is \"" << line
+              << "\", should be \"" TEST_STR_LINE_2 "\"" << std::endl;
+    goto end;
+  }
+
+  if (!std::getline(inputStream, line)) {
+    std::cout << "getline returned false, should be true" << std::endl;
+    goto end;
+  }
+  if (line != TEST_STR_LINE_3) {
+    std::cout << "Line 3 is \"" << line
+              << "\", should be \"" TEST_STR_LINE_3 "\"" << std::endl;
+    goto end;
+  }
+
+  if (std::getline(inputStream, line)) {
+    std::cout << "getline returned true, should be false" << std::endl;
+    goto end;
+  }
+
+  inputBuf.close();
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  // Perform fourth read test - run the event loop outside of underflow()
+  if (!cb(*loop, inputPipe, outputData, 128, cmakeCommand)) {
+    goto end;
+  }
+  inputBuf.open(inputPipe);
+  if (!inputBuf.is_open()) {
+    std::cout << "is_open() is false, should be true" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  uv_run(loop, UV_RUN_DEFAULT);
+  if ((readLen = inputBuf.in_avail()) != 72) {
+    std::cout << "in_avail() returned " << readLen << ", should be 72"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 128) {
+    std::cout << "sgetn() returned " << readLen << ", should be 128"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 128"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+
+  inputBuf.close();
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  // Perform fifth read test - close the streambuf in the middle of a read
+  timer.init(*loop, &inputBuf);
+  if (!cb(*loop, inputPipe, outputData, 128, cmakeCommand)) {
+    goto end;
+  }
+  inputBuf.open(inputPipe);
+  if (!inputBuf.is_open()) {
+    std::cout << "is_open() is false, should be true" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != 0) {
+    std::cout << "in_avail() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  uv_timer_start(timer,
+                 [](uv_timer_t* handle) {
+                   auto buf = static_cast<cmUVStreambuf*>(handle->data);
+                   buf->close();
+                 },
+                 0, 0);
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+  if (inputBuf.is_open()) {
+    std::cout << "is_open() is true, should be false" << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.in_avail()) != -1) {
+    std::cout << "in_avail() returned " << readLen << ", should be -1"
+              << std::endl;
+    goto end;
+  }
+  if ((readLen = inputBuf.sgetn(inputData.data(), 128)) != 0) {
+    std::cout << "sgetn() returned " << readLen << ", should be 0"
+              << std::endl;
+    goto end;
+  }
+
+  success = true;
+
+end:
+  return success;
+}
+
+int testUVStreambuf(int argc, char** const argv)
+{
+  if (argc < 2) {
+    std::cout << "Invalid arguments.\n";
+    return -1;
+  }
+
+  if (!testUVStreambufRead(writeDataToStreamPipe, argv[1])) {
+    std::cout << "While executing testUVStreambufRead() with pipe.\n";
+    return -1;
+  }
+
+  if (!testUVStreambufRead(writeDataToStreamProcess, argv[1])) {
+    std::cout << "While executing testUVStreambufRead() with process.\n";
+    return -1;
+  }
+
+  return 0;
+}