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+'\" et
+.TH SETGID "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.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
+\(em set-group-ID
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+int setgid(gid_t \fIgid\fP);
+.fi
+.SH DESCRIPTION
+If the process has appropriate privileges,
+\fIsetgid\fR()
+shall set the real group ID, effective group ID, and the saved
+set-group-ID of the calling process to
+.IR gid .
+.P
+If the process does not have appropriate privileges, but
+.IR gid
+is equal to the real group ID or the saved set-group-ID,
+\fIsetgid\fR()
+shall set the effective group ID to
+.IR gid ;
+the real group ID and saved set-group-ID shall remain unchanged.
+.P
+The
+\fIsetgid\fR()
+function shall not affect the supplementary group list in any way.
+.P
+Any supplementary group IDs of the calling process shall remain
+unchanged.
+.SH "RETURN VALUE"
+Upon successful completion, 0 is returned. Otherwise, \(mi1 shall be
+returned and
+.IR errno
+set to indicate the error.
+.SH ERRORS
+The
+\fIsetgid\fR()
+function shall fail if:
+.TP
+.BR EINVAL
+The value of the
+.IR gid
+argument is invalid and is not supported by the implementation.
+.TP
+.BR EPERM
+The process does not have appropriate privileges and
+.IR gid
+does not match the real group ID or the saved set-group-ID.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+Refer to the RATIONALE section in
+.IR "\fIsetuid\fR\^(\|)".
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIexec\fR\^",
+.IR "\fIgetegid\fR\^(\|)",
+.IR "\fIgeteuid\fR\^(\|)",
+.IR "\fIgetgid\fR\^(\|)",
+.IR "\fIgetuid\fR\^(\|)",
+.IR "\fIsetegid\fR\^(\|)",
+.IR "\fIseteuid\fR\^(\|)",
+.IR "\fIsetregid\fR\^(\|)",
+.IR "\fIsetreuid\fR\^(\|)",
+.IR "\fIsetuid\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "\fB<sys_types.h>\fP",
+.IR "\fB<unistd.h>\fP"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
+
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .