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+.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" Modified by Michael Haardt <michael@moria.de>
+.\" Modified Sun Jul 25 10:14:13 1993 by Rik Faith <faith@cs.unc.edu>
+.\" Modified 15 April 1995 by Michael Chastain <mec@shell.portal.com>
+.\" Update calling parameters to Linux 1.2.4 values.
+.\" Modified 10 June 1995 by Andries Brouwer <aeb@cwi.nl>
+.\" Modified 3 May 1996 by Martin Schulze <joey@infodrom.north.de>
+.\" Modified Wed Nov 6 04:05:28 1996 by Eric S. Raymond <esr@thyrsus.com>
+.\" Modified Sat Jan 29 01:08:23 2000 by aeb
+.\"
+.TH setup 2 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+setup \- setup devices and filesystems, mount root filesystem
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <unistd.h>
+.P
+.B [[deprecated]] int setup(void);
+.fi
+.SH DESCRIPTION
+.BR setup ()
+is called once from within
+.IR linux/init/main.c .
+It calls initialization functions for devices and filesystems
+configured into the kernel and then mounts the root filesystem.
+.P
+No user process may call
+.BR setup ().
+Any user process, even a process with superuser permission,
+will receive
+.BR EPERM .
+.SH RETURN VALUE
+.BR setup ()
+always returns \-1 for a user process.
+.SH ERRORS
+.TP
+.B EPERM
+Always, for a user process.
+.SH STANDARDS
+Linux.
+.SH VERSIONS
+Removed in Linux 2.1.121.
+.P
+The calling sequence varied: at some times
+.BR setup ()
+has had a single argument
+.I "void\ *BIOS"
+and at other times a single argument
+.IR "int magic" .