Problem - Kevin Tafuro

if (!(hResourceLock = CreateMutex(0, FALSE, lpName))) return 0;
if (WaitForSingleObject(hResourceLock, INFINITE) = = WAIT_FAILED) {
CloseHandle(hResourceLock);
return 0;
}
return hResourceLock;
}
BOOL SpcUnlockResource(HANDLE hResourceLock) {
if (!ReleaseMutex(hResourceLock)) return FALSE;
CloseHandle(hResourceLock);
return TRUE;
}
See Also
Recipe 2.9
2.11 Creating Files for Temporary Use
Problem
You need to create a file to use as scratch space that may contain sensitive data.
Solution
Generate a random filename and attempt to create the file, failing if the file already
exists. If the file cannot be created because it already exists, repeat the process until it
succeeds. If creating the file fails for any other reason, abort the process.
Discussion
When creating temporary files, you should consider using a knownsafe
directory to store them, as described in Recipe 2.4.
The need for temporary files is common. More often than not, other processes have
no need to access the temporary files you create, and especially if the files contain
sensitive data, it is best to do everything possible to ensure that other processes cannot
access them. It is also important that temporary files do not remain on the filesystem
any longer than necessary. If the program creating temporary files terminates
unexpectedly before it cleans up the files, temporary directories often become littered
with files of no interest or value to anyone or anything. Worse, if the temporary
files contain sensitive data, they are suddenly both interesting and valuable to an
attacker.
Creating Files for Temporary Use | 65
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