Traditionally processes are identified globally via process identifiers (PIDs). Due to how pid allocation works the kernel is free to recycle PIDs once a process has been reaped. As such, PIDs do not allow another process to maintain a private, stable reference on a...
On most Linux filesystems ownership is expressed in the form of user identifiers (uid) and group identifiers (gid). The only way to alter ownership of a filesystem object is to use a system call from the chown* family to specify a new uid and gid. Changing ownership...
