Table of Contents
The
function returns the real group ID of the calling process, returns the
effective group ID of the calling process. The real group ID is specified
at login time. The real group ID is the group of the user who invoked the
program. As the effective group ID gives the process additional permissions
during the execution of mode processes, is used to determine the real-user-id
of the calling process.
The and functions are always successful,
and no return value is reserved to indicate an error.
and conform to
Table of Contents