Real User ID
The real UID (ruid) and real GID (rgid) identify the real owner of the process and affect the permissions for sending signals. A process without superuser privilege can signal another process only if the sender’s real UID matches with the real UID of the receiver. Since child processes inherit the credentials from the parent, they can signal each other.
Read more about this topic: User Identifier
Famous quotes containing the words real and/or user:
“The real grounds of difference upon important political questions no longer correspond with party lines.... Politics is no longer the topic of this country. Its important questions are settled... Great minds hereafter are to be employed on other matters.... Government no longer has its ancient importance.... The people’s progress, progress of every sort, no longer depends on government. But enough of politics. Henceforth I am out more than ever.”
—Rutherford Birchard Hayes (1822–1893)
“A worker may be the hammer’s master, but the hammer still prevails. A tool knows exactly how it is meant to be handled, while the user of the tool can only have an approximate idea.”
—Milan Kundera (b. 1929)