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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SETGID" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" setgid 
+.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
+setgid \- set-group-ID
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int setgid(gid_t\fP \fIgid\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If the process has appropriate privileges, \fIsetgid\fP() shall set
+the real group ID, effective group ID, and the saved
+set-group-ID of the calling process to \fIgid\fP.
+.LP
+If the process does not have appropriate privileges, but \fIgid\fP
+is equal to the real group ID or the saved set-group-ID,
+\fIsetgid\fP() shall set the effective group ID to \fIgid\fP; the
+real group ID and saved set-group-ID shall remain
+unchanged.
+.LP
+The \fIsetgid\fP() function shall not affect the supplementary group
+list in any way.
+.LP
+Any supplementary group IDs of the calling process shall remain unchanged.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 is returned. Otherwise, -1 shall be
+returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fIsetgid\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The value of the \fIgid\fP argument is invalid and is not supported
+by the implementation.
+.TP 7
+.B EPERM
+The process does not have appropriate privileges and \fIgid\fP does
+not match the real group ID or the saved
+set-group-ID.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+Refer to the RATIONALE section in \fIsetuid\fP().
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIexec\fP(), \fIgetegid\fP(), \fIgeteuid\fP(), \fIgetgid\fP(),
+\fIgetuid\fP(),
+\fIsetegid\fP(), \fIseteuid\fP(), \fIsetregid\fP(), \fIsetreuid\fP(),
+\fIsetuid\fP(),
+the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<sys/types.h>\fP,
+\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 .