#include "llvm/Support/LockFileManager.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Errc.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <sys/stat.h>
#include <sys/types.h>
/// \returns The process ID of the process that owns this lock file
Optional<std::pair<std::string, int> >
LockFileManager::readLockFile(StringRef LockFileName) {
- // Check whether the lock file exists. If not, clearly there's nothing
- // to read, so we just return.
- if (!sys::fs::exists(LockFileName))
- return None;
-
// 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.
- std::unique_ptr<MemoryBuffer> MB;
- if (MemoryBuffer::getFile(LockFileName, MB))
+ 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(), " ");
+ std::tie(Hostname, PIDStr) = getToken(MB.getBuffer(), " ");
PIDStr = PIDStr.substr(PIDStr.find_first_not_of(" "));
int PID;
- if (!PIDStr.getAsInteger(10, PID))
- return std::make_pair(std::string(Hostname), 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);
LockFileManager::LockFileManager(StringRef FileName)
{
this->FileName = FileName;
- LockFileName = FileName;
+ if (std::error_code EC = sys::fs::make_absolute(this->FileName)) {
+ Error = EC;
+ return;
+ }
+ LockFileName = this->FileName;
LockFileName += ".lock";
// If the lock file already exists, don't bother to try to create our own
UniqueLockFileName = LockFileName;
UniqueLockFileName += "-%%%%%%%%";
int UniqueLockFileID;
- if (error_code EC
- = sys::fs::createUniqueFile(UniqueLockFileName.str(),
- UniqueLockFileID,
- UniqueLockFileName)) {
+ if (std::error_code EC = sys::fs::createUniqueFile(
+ UniqueLockFileName.str(), UniqueLockFileID, UniqueLockFileName)) {
Error = EC;
return;
}
while (1) {
// Create a link from the lock file name. If this succeeds, we're done.
- error_code EC =
+ std::error_code EC =
sys::fs::create_link(UniqueLockFileName.str(), LockFileName.str());
- if (EC == errc::success)
+ if (!EC)
return;
if (EC != errc::file_exists) {
sys::fs::remove(UniqueLockFileName.str());
}
-void LockFileManager::waitForUnlock() {
+LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
if (getState() != LFS_Shared)
- return;
+ return Res_Success;
#if LLVM_ON_WIN32
unsigned long Interval = 1;
#if LLVM_ON_WIN32
Sleep(Interval);
#else
- nanosleep(&Interval, NULL);
+ nanosleep(&Interval, nullptr);
#endif
bool LockFileJustDisappeared = false;
// If the lock file is still expected to be there, check whether it still
// is.
if (!LockFileGone) {
- bool Exists;
- if (!sys::fs::exists(LockFileName.str(), Exists) && !Exists) {
+ if (sys::fs::access(LockFileName.c_str(), sys::fs::AccessMode::Exist) ==
+ errc::no_such_file_or_directory) {
LockFileGone = true;
LockFileJustDisappeared = true;
}
// available now.
if (LockFileGone) {
if (sys::fs::exists(FileName.str())) {
- return;
+ return Res_Success;
}
// The lock file is gone, so now we're waiting for the original file to
// owning the lock died without cleaning up, just bail out.
if (!LockFileGone &&
!processStillExecuting((*Owner).first, (*Owner).second)) {
- return;
+ return Res_OwnerDied;
}
// Exponentially increase the time we wait for the lock to be removed.
);
// Give up.
+ return Res_Timeout;
}