.TH SETREGID 2 "12 February 1983"
setregid \- set real and effective group ID
The real and effective group ID's of the current process
are set to the arguments.
Only the super-user may change the real group ID
of a process. Unpriviledged users may change the
effective group ID to the real group ID, but to
Supplying a value of \-1 for either the real or effective
group ID forces the system to substitute the current
ID in place of the \-1 parameter.
Upon successful completion, a value of 0 is returned. Otherwise,
a value of \-1 is returned and \fIerrno\fP is set to indicate the error.
The current process is not the super-user and a change
other than changing the effective group-id to the real group-id
getgid(2), setreuid(2), setgid(3)