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Revert create_symbolic_link and both depending changes

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This reverts commits r203136, r203137, and r203138.

This code doesn't build on Windows.  Even on Vista+, Windows requires
elevated privileges to create a symlink.  Therefore we can't use
symlinks in the compiler.  We'll have to find another approach.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-03-06 19:07:35 +00:00
parent 6c43168ce3
commit bbf1c8d24c
4 changed files with 24 additions and 72 deletions
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56
lib/Support/LockFileManager.cpp
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@ -115,42 +115,34 @@ LockFileManager::LockFileManager(StringRef FileName)
}
}
while (1) {
// Create a symbolic link from the lock file name. If this succeeds, we're
// done. Note that we are using symbolic link because hard links are not
// supported by all filesystems.
error_code EC
= sys::fs::create_symbolic_link(UniqueLockFileName.str(),
LockFileName.str());
if (EC == errc::success)
return;
// Create a hard link from the lock file name. If this succeeds, we're done.
error_code EC
= sys::fs::create_hard_link(UniqueLockFileName.str(),
LockFileName.str());
if (EC == errc::success)
return;
if (EC != errc::file_exists) {
Error = EC;
return;
}
// Creating the hard link failed.
// 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.str());
return;
}
#ifdef LLVM_ON_UNIX
// The creation of the hard link may appear to fail, but if stat'ing the
// unique file returns a link count of 2, then we can still declare success.
struct stat StatBuf;
if (stat(UniqueLockFileName.c_str(), &StatBuf) == 0 &&
StatBuf.st_nlink == 2)
return;
#endif
if (!sys::fs::exists(LockFileName.str())) {
// The previous owner released the lock file before we could read it.
// Try to get ownership again.
continue;
}
// Someone else managed to create the lock file first. Wipe out our unique
// lock file (it's useless now) and read the process ID from the lock file.
sys::fs::remove(UniqueLockFileName.str());
if ((Owner = readLockFile(LockFileName)))
return;
// There is a lock file that nobody owns; try to clean it up and get
// ownership.
if ((EC = sys::fs::remove(LockFileName.str()))) {
Error = EC;
return;
}
}
// There is a lock file that nobody owns; try to clean it up and report
// an error.
sys::fs::remove(LockFileName.str());
Error = EC;
}
LockFileManager::LockFileState LockFileManager::getState() const {