Encyclopedia  |   World Factbook  |   World Flags  |   Reference Tables  |   List of Lists     
   Academic Disciplines  |   Historical Timeline  |   Themed Timelines  |   Biographies  |   How-Tos     
Sponsor by The Tattoo Collection
Process identifier
Main Page | See live article | Alphabetical index

Process identifier

In computing, the process identifier (normally referred to as the process ID or just PID) is a number used by the UNIX kernel to uniquely identify a process.

The PID is returned by the fork system call to both the parent and child processes, so that a process can tell which it is.

The PID can be passed to wait() or kill() to perform actions on the given process.

This article was originally based on material from the Free On-line Dictionary of Computing and is used with permission under the GFDL.