+ChangeToTempDir::ChangeToTempDir() : initialPath_(fs::current_path()) {
+ std::string p = dir_.path().string();
+ ::chdir(p.c_str());
+}
+
+ChangeToTempDir::~ChangeToTempDir() {
+ std::string p = initialPath_.string();
+ ::chdir(p.c_str());
+}
+
+namespace detail {
+
+SavedState disableInvalidParameters() {
+#ifdef _WIN32
+ SavedState ret;
+ ret.previousThreadLocalHandler = _set_thread_local_invalid_parameter_handler(
+ [](const wchar_t*,
+ const wchar_t*,
+ const wchar_t*,
+ unsigned int,
+ uintptr_t) {});
+ ret.previousCrtReportMode = _CrtSetReportMode(_CRT_ASSERT, 0);
+ return ret;
+#else
+ return SavedState();
+#endif
+}
+
+#ifdef _WIN32
+void enableInvalidParameters(SavedState state) {
+ _set_thread_local_invalid_parameter_handler(
+ (_invalid_parameter_handler)state.previousThreadLocalHandler);
+ _CrtSetReportMode(_CRT_ASSERT, state.previousCrtReportMode);
+}
+#else
+void enableInvalidParameters(SavedState) {}
+#endif
+
+bool hasPCREPatternMatch(StringPiece pattern, StringPiece target) {
+ return boost::regex_match(
+ target.begin(),
+ target.end(),
+ boost::regex(pattern.begin(), pattern.end())
+ );
+}
+
+bool hasNoPCREPatternMatch(StringPiece pattern, StringPiece target) {
+ return !hasPCREPatternMatch(pattern, target);
+}
+
+} // namespace detail
+
+CaptureFD::CaptureFD(int fd, ChunkCob chunk_cob)
+ : chunkCob_(std::move(chunk_cob)), fd_(fd), readOffset_(0) {
+ oldFDCopy_ = dup(fd_);
+ PCHECK(oldFDCopy_ != -1) << "Could not copy FD " << fd_;
+
+ int file_fd = open(file_.path().string().c_str(), O_WRONLY|O_CREAT, 0600);
+ PCHECK(dup2(file_fd, fd_) != -1) << "Could not replace FD " << fd_
+ << " with " << file_fd;
+ PCHECK(close(file_fd) != -1) << "Could not close " << file_fd;
+}
+
+void CaptureFD::release() {
+ if (oldFDCopy_ != fd_) {
+ readIncremental(); // Feed chunkCob_
+ PCHECK(dup2(oldFDCopy_, fd_) != -1) << "Could not restore old FD "
+ << oldFDCopy_ << " into " << fd_;
+ PCHECK(close(oldFDCopy_) != -1) << "Could not close " << oldFDCopy_;
+ oldFDCopy_ = fd_; // Make this call idempotent
+ }
+}
+
+CaptureFD::~CaptureFD() {
+ release();
+}
+
+std::string CaptureFD::read() const {
+ std::string contents;
+ std::string filename = file_.path().string();
+ PCHECK(folly::readFile(filename.c_str(), contents));
+ return contents;
+}
+
+std::string CaptureFD::readIncremental() {
+ std::string filename = file_.path().string();
+ // Yes, I know that I could just keep the file open instead. So sue me.
+ folly::File f(openNoInt(filename.c_str(), O_RDONLY), true);
+ auto size = size_t(lseek(f.fd(), 0, SEEK_END) - readOffset_);
+ std::unique_ptr<char[]> buf(new char[size]);
+ auto bytes_read = folly::preadFull(f.fd(), buf.get(), size, readOffset_);
+ PCHECK(ssize_t(size) == bytes_read);
+ readOffset_ += off_t(size);
+ chunkCob_(StringPiece(buf.get(), buf.get() + size));
+ return std::string(buf.get(), size);
+}
+