1 files changed, 0 insertions, 355 deletions

diff --git a/contrib/llvm/lib/Support/LockFileManager.cpp b/contrib/llvm/lib/Support/LockFileManager.cpp
deleted file mode 100644
index 10181192afbd..000000000000
--- a/contrib/llvm/lib/Support/LockFileManager.cpp
+++ /dev/null
@@ -1,355 +0,0 @@
-//===--- LockFileManager.cpp - File-level Locking Utility------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/LockFileManager.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/Support/Errc.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Signals.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cerrno>
-#include <ctime>
-#include <memory>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <system_error>
-#include <tuple>
-#ifdef _WIN32
-#include <windows.h>
-#endif
-#if LLVM_ON_UNIX
-#include <unistd.h>
-#endif
-
-#if defined(__APPLE__) && defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && (__MAC_OS_X_VERSION_MIN_REQUIRED > 1050)
-#define USE_OSX_GETHOSTUUID 1
-#else
-#define USE_OSX_GETHOSTUUID 0
-#endif
-
-#if USE_OSX_GETHOSTUUID
-#include <uuid/uuid.h>
-#endif
-
-using namespace llvm;
-
-/// Attempt to read the lock file with the given name, if it exists.
-///
-/// \param LockFileName The name of the lock file to read.
-///
-/// \returns The process ID of the process that owns this lock file
-Optional<std::pair<std::string, int> >
-LockFileManager::readLockFile(StringRef LockFileName) {
-  // Read the owning host and PID out of the lock file. If it appears that the
-  // owning process is dead, the lock file is invalid.
-  ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
-      MemoryBuffer::getFile(LockFileName);
-  if (!MBOrErr) {
-    sys::fs::remove(LockFileName);
-    return None;
-  }
-  MemoryBuffer &MB = *MBOrErr.get();
-
-  StringRef Hostname;
-  StringRef PIDStr;
-  std::tie(Hostname, PIDStr) = getToken(MB.getBuffer(), " ");
-  PIDStr = PIDStr.substr(PIDStr.find_first_not_of(" "));
-  int PID;
-  if (!PIDStr.getAsInteger(10, PID)) {
-    auto Owner = std::make_pair(std::string(Hostname), PID);
-    if (processStillExecuting(Owner.first, Owner.second))
-      return Owner;
-  }
-
-  // Delete the lock file. It's invalid anyway.
-  sys::fs::remove(LockFileName);
-  return None;
-}
-
-static std::error_code getHostID(SmallVectorImpl<char> &HostID) {
-  HostID.clear();
-
-#if USE_OSX_GETHOSTUUID
-  // On OS X, use the more stable hardware UUID instead of hostname.
-  struct timespec wait = {1, 0}; // 1 second.
-  uuid_t uuid;
-  if (gethostuuid(uuid, &wait) != 0)
-    return std::error_code(errno, std::system_category());
-
-  uuid_string_t UUIDStr;
-  uuid_unparse(uuid, UUIDStr);
-  StringRef UUIDRef(UUIDStr);
-  HostID.append(UUIDRef.begin(), UUIDRef.end());
-
-#elif LLVM_ON_UNIX
-  char HostName[256];
-  HostName[255] = 0;
-  HostName[0] = 0;
-  gethostname(HostName, 255);
-  StringRef HostNameRef(HostName);
-  HostID.append(HostNameRef.begin(), HostNameRef.end());
-
-#else
-  StringRef Dummy("localhost");
-  HostID.append(Dummy.begin(), Dummy.end());
-#endif
-
-  return std::error_code();
-}
-
-bool LockFileManager::processStillExecuting(StringRef HostID, int PID) {
-#if LLVM_ON_UNIX && !defined(__ANDROID__)
-  SmallString<256> StoredHostID;
-  if (getHostID(StoredHostID))
-    return true; // Conservatively assume it's executing on error.
-
-  // Check whether the process is dead. If so, we're done.
-  if (StoredHostID == HostID && getsid(PID) == -1 && errno == ESRCH)
-    return false;
-#endif
-
-  return true;
-}
-
-namespace {
-
-/// An RAII helper object ensure that the unique lock file is removed.
-///
-/// Ensures that if there is an error or a signal before we finish acquiring the
-/// lock, the unique file will be removed. And if we successfully take the lock,
-/// the signal handler is left in place so that signals while the lock is held
-/// will remove the unique lock file. The caller should ensure there is a
-/// matching call to sys::DontRemoveFileOnSignal when the lock is released.
-class RemoveUniqueLockFileOnSignal {
-  StringRef Filename;
-  bool RemoveImmediately;
-public:
-  RemoveUniqueLockFileOnSignal(StringRef Name)
-  : Filename(Name), RemoveImmediately(true) {
-    sys::RemoveFileOnSignal(Filename, nullptr);
-  }
-
-  ~RemoveUniqueLockFileOnSignal() {
-    if (!RemoveImmediately) {
-      // Leave the signal handler enabled. It will be removed when the lock is
-      // released.
-      return;
-    }
-    sys::fs::remove(Filename);
-    sys::DontRemoveFileOnSignal(Filename);
-  }
-
-  void lockAcquired() { RemoveImmediately = false; }
-};
-
-} // end anonymous namespace
-
-LockFileManager::LockFileManager(StringRef FileName)
-{
-  this->FileName = FileName;
-  if (std::error_code EC = sys::fs::make_absolute(this->FileName)) {
-    std::string S("failed to obtain absolute path for ");
-    S.append(this->FileName.str());
-    setError(EC, S);
-    return;
-  }
-  LockFileName = this->FileName;
-  LockFileName += ".lock";
-
-  // If the lock file already exists, don't bother to try to create our own
-  // lock file; it won't work anyway. Just figure out who owns this lock file.
-  if ((Owner = readLockFile(LockFileName)))
-    return;
-
-  // Create a lock file that is unique to this instance.
-  UniqueLockFileName = LockFileName;
-  UniqueLockFileName += "-%%%%%%%%";
-  int UniqueLockFileID;
-  if (std::error_code EC = sys::fs::createUniqueFile(
-          UniqueLockFileName, UniqueLockFileID, UniqueLockFileName)) {
-    std::string S("failed to create unique file ");
-    S.append(UniqueLockFileName.str());
-    setError(EC, S);
-    return;
-  }
-
-  // Write our process ID to our unique lock file.
-  {
-    SmallString<256> HostID;
-    if (auto EC = getHostID(HostID)) {
-      setError(EC, "failed to get host id");
-      return;
-    }
-
-    raw_fd_ostream Out(UniqueLockFileID, /*shouldClose=*/true);
-    Out << HostID << ' ';
-#if LLVM_ON_UNIX
-    Out << getpid();
-#else
-    Out << "1";
-#endif
-    Out.close();
-
-    if (Out.has_error()) {
-      // We failed to write out PID, so report the error, remove the
-      // unique lock file, and fail.
-      std::string S("failed to write to ");
-      S.append(UniqueLockFileName.str());
-      setError(Out.error(), S);
-      sys::fs::remove(UniqueLockFileName);
-      return;
-    }
-  }
-
-  // Clean up the unique file on signal, which also releases the lock if it is
-  // held since the .lock symlink will point to a nonexistent file.
-  RemoveUniqueLockFileOnSignal RemoveUniqueFile(UniqueLockFileName);
-
-  while (true) {
-    // Create a link from the lock file name. If this succeeds, we're done.
-    std::error_code EC =
-        sys::fs::create_link(UniqueLockFileName, LockFileName);
-    if (!EC) {
-      RemoveUniqueFile.lockAcquired();
-      return;
-    }
-
-    if (EC != errc::file_exists) {
-      std::string S("failed to create link ");
-      raw_string_ostream OSS(S);
-      OSS << LockFileName.str() << " to " << UniqueLockFileName.str();
-      setError(EC, OSS.str());
-      return;
-    }
-
-    // Someone else managed to create the lock file first. Read the process ID
-    // from the lock file.
-    if ((Owner = readLockFile(LockFileName))) {
-      // Wipe out our unique lock file (it's useless now)
-      sys::fs::remove(UniqueLockFileName);
-      return;
-    }
-
-    if (!sys::fs::exists(LockFileName)) {
-      // The previous owner released the lock file before we could read it.
-      // Try to get ownership again.
-      continue;
-    }
-
-    // There is a lock file that nobody owns; try to clean it up and get
-    // ownership.
-    if ((EC = sys::fs::remove(LockFileName))) {
-      std::string S("failed to remove lockfile ");
-      S.append(UniqueLockFileName.str());
-      setError(EC, S);
-      return;
-    }
-  }
-}
-
-LockFileManager::LockFileState LockFileManager::getState() const {
-  if (Owner)
-    return LFS_Shared;
-
-  if (ErrorCode)
-    return LFS_Error;
-
-  return LFS_Owned;
-}
-
-std::string LockFileManager::getErrorMessage() const {
-  if (ErrorCode) {
-    std::string Str(ErrorDiagMsg);
-    std::string ErrCodeMsg = ErrorCode.message();
-    raw_string_ostream OSS(Str);
-    if (!ErrCodeMsg.empty())
-      OSS << ": " << ErrCodeMsg;
-    return OSS.str();
-  }
-  return "";
-}
-
-LockFileManager::~LockFileManager() {
-  if (getState() != LFS_Owned)
-    return;
-
-  // Since we own the lock, remove the lock file and our own unique lock file.
-  sys::fs::remove(LockFileName);
-  sys::fs::remove(UniqueLockFileName);
-  // The unique file is now gone, so remove it from the signal handler. This
-  // matches a sys::RemoveFileOnSignal() in LockFileManager().
-  sys::DontRemoveFileOnSignal(UniqueLockFileName);
-}
-
-LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
-  if (getState() != LFS_Shared)
-    return Res_Success;
-
-#ifdef _WIN32
-  unsigned long Interval = 1;
-#else
-  struct timespec Interval;
-  Interval.tv_sec = 0;
-  Interval.tv_nsec = 1000000;
-#endif
-  // Don't wait more than 40s per iteration. Total timeout for the file
-  // to appear is ~1.5 minutes.
-  const unsigned MaxSeconds = 40;
-  do {
-    // Sleep for the designated interval, to allow the owning process time to
-    // finish up and remove the lock file.
-    // FIXME: Should we hook in to system APIs to get a notification when the
-    // lock file is deleted?
-#ifdef _WIN32
-    Sleep(Interval);
-#else
-    nanosleep(&Interval, nullptr);
-#endif
-
-    if (sys::fs::access(LockFileName.c_str(), sys::fs::AccessMode::Exist) ==
-        errc::no_such_file_or_directory) {
-      // If the original file wasn't created, somone thought the lock was dead.
-      if (!sys::fs::exists(FileName))
-        return Res_OwnerDied;
-      return Res_Success;
-    }
-
-    // If the process owning the lock died without cleaning up, just bail out.
-    if (!processStillExecuting((*Owner).first, (*Owner).second))
-      return Res_OwnerDied;
-
-    // Exponentially increase the time we wait for the lock to be removed.
-#ifdef _WIN32
-    Interval *= 2;
-#else
-    Interval.tv_sec *= 2;
-    Interval.tv_nsec *= 2;
-    if (Interval.tv_nsec >= 1000000000) {
-      ++Interval.tv_sec;
-      Interval.tv_nsec -= 1000000000;
-    }
-#endif
-  } while (
-#ifdef _WIN32
-           Interval < MaxSeconds * 1000
-#else
-           Interval.tv_sec < (time_t)MaxSeconds
-#endif
-           );
-
-  // Give up.
-  return Res_Timeout;
-}
-
-std::error_code LockFileManager::unsafeRemoveLockFile() {
-  return sys::fs::remove(LockFileName);
-}