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Suppose I create a file for writing like this:
std::ofstream my_file("filename", std::ios_base::out | std::ios_base::trunc);
How are the permissions of this file determined? I’ve had a program running overnight generating files about once a minute – some are 0644 but others are 0660, and there’s nothing in my code that should make it change. (I’ve seen that some implementations allow a third argument to set the file permissions – I’m using gcc 4.1.2 which doesn’t appear to support this).
It depends on the umask.