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[Support/LockFileManager] Use symbolic link for the lock file.

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Hard links do not work on SMB network directories, and it causes us to fail
to build clang module files if the module cache is in such a directory.
rdar://15944959

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203137 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Argyrios Kyrtzidis 2014-03-06 17:37:04 +00:00
parent bd3f9c0b6b
commit 7b95c0d529
1 changed files with 4 additions and 13 deletions
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17
lib/Support/LockFileManager.cpp
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@ -115,24 +115,15 @@ LockFileManager::LockFileManager(StringRef FileName)
}
}
// Create a hard link from the lock file name. If this succeeds, we're done.
// 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_hard_link(UniqueLockFileName.str(),
= sys::fs::create_symbolic_link(UniqueLockFileName.str(),
LockFileName.str());
if (EC == errc::success)
return;
// Creating the hard link failed.
#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
// 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());