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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SETREGID" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" setregid 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+setregid \- set real and effective group IDs
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int setregid(gid_t\fP \fIrgid\fP\fB, gid_t\fP \fIegid\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsetregid\fP() function shall set the real and effective group
+IDs of the calling process.
+.LP
+If \fIrgid\fP is -1, the real group ID shall not be changed; if \fIegid\fP
+is -1, the effective group ID shall not be
+changed.
+.LP
+The real and effective group IDs may be set to different values in
+the same call.
+.LP
+Only a process with appropriate privileges can set the real group
+ID and the effective group ID to any valid value.
+.LP
+A non-privileged process can set either the real group ID to the saved
+set-group-ID from one of the \fIexec\fP family of functions, or the
+effective group ID to the saved set-group-ID or the real group
+ID.
+.LP
+Any supplementary group IDs of the calling process remain unchanged.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 shall be returned. Otherwise, -1 shall
+be returned and \fIerrno\fP set to indicate the error, and
+neither of the group IDs are changed.
+.SH ERRORS
+.LP
+The \fIsetregid\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The value of the \fIrgid\fP or \fIegid\fP argument is invalid or out-of-range.
+.TP 7
+.B EPERM
+The process does not have appropriate privileges and a change other
+than changing the real group ID to the saved set-group-ID,
+or changing the effective group ID to the real group ID or the saved
+set-group-ID, was requested.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+If a set-group-ID process sets its effective group ID to its real
+group ID, it can still set its effective group ID back to the
+saved set-group-ID.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIexec\fP(), \fIgetegid\fP(), \fIgeteuid\fP(), \fIgetgid\fP(),
+\fIgetuid\fP(),
+\fIsetegid\fP(), \fIseteuid\fP(), \fIsetgid\fP(), \fIsetreuid\fP(),
+\fIsetuid\fP(), the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .