.\" Copyright (c) 1983 Regents of the University of California. .\" All rights reserved. The Berkeley software License Agreement .\" specifies the terms and conditions for redistribution. .\" .\" @(#)setregid.2 6.1 (Berkeley) 5/15/85 .\" .TH SETREGID 2 "May 15, 1985" .UC 5 .SH NAME setregid \- set real and effective group ID .SH SYNOPSIS .ft B setregid(rgid, egid) .br int rgid, egid; .ft R .SH DESCRIPTION The real and effective group ID's of the current process are set to the arguments. Unprivileged users may change the real group ID to the effective group ID and vice-versa; only the super-user may make other changes. .PP 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. .SH "RETURN VALUE 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. .SH "ERRORS .TP 15 [EPERM] The current process is not the super-user and a change other than changing the effective group-id to the real group-id was specified. .SH "SEE ALSO" getgid(2), setreuid(2), setgid(3)