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-.\" Copyright (C), 1994, Graeme W. Wilford. (Wilf.)
-.\" and Copyright (C) 2010, 2015, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Fri Jul 29th 12:56:44 BST 1994  Wilf. <G.Wilford@ee.surrey.ac.uk>
-.\" Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com>
-.\" Modified 2002-03-09 by aeb
-.\"
-.TH setgid 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-setgid \- set group identity
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int setgid(gid_t " gid );
-.fi
-.SH DESCRIPTION
-.BR setgid ()
-sets the effective group ID of the calling process.
-If the calling process is privileged (more precisely: has the
-.B CAP_SETGID
-capability in its user namespace),
-the real GID and saved set-group-ID are also set.
-.P
-Under Linux,
-.BR setgid ()
-is implemented like the POSIX version with the
-.B _POSIX_SAVED_IDS
-feature.
-This allows a set-group-ID program that is not set-user-ID-root
-to drop all of its group
-privileges, do some un-privileged work, and then reengage the original
-effective group ID in a secure manner.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-The group ID specified in
-.I gid
-is not valid in this user namespace.
-.TP
-.B EPERM
-The calling process is not privileged (does not have the
-\fBCAP_SETGID\fP capability in its user namespace), and
-.I gid
-does not match the real group ID or saved set-group-ID of
-the calling process.
-.SH VERSIONS
-.SS C library/kernel differences
-At the kernel level, user IDs and group IDs are a per-thread attribute.
-However, POSIX requires that all threads in a process
-share the same credentials.
-The NPTL threading implementation handles the POSIX requirements by
-providing wrapper functions for
-the various system calls that change process UIDs and GIDs.
-These wrapper functions (including the one for
-.BR setgid ())
-employ a signal-based technique to ensure
-that when one thread changes credentials,
-all of the other threads in the process also change their credentials.
-For details, see
-.BR nptl (7).
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4.
-.P
-The original Linux
-.BR setgid ()
-system call supported only 16-bit group IDs.
-Subsequently, Linux 2.4 added
-.BR setgid32 ()
-supporting 32-bit IDs.
-The glibc
-.BR setgid ()
-wrapper function transparently deals with the variation across kernel versions.
-.SH SEE ALSO
-.BR getgid (2),
-.BR setegid (2),
-.BR setregid (2),
-.BR capabilities (7),
-.BR credentials (7),
-.BR user_namespaces (7)