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CentOS 7.0 - man page for setup (centos section 2)

SETUP(2)				      Linux Programmer's Manual 				     SETUP(2)

NAME
setup - setup devices and file systems, mount root file system
SYNOPSIS
#include <unistd.h> int setup(void);
DESCRIPTION
setup() is called once from within linux/init/main.c. It calls initialization functions for devices and file systems configured into the kernel and then mounts the root file system. No user process may call setup(). Any user process, even a process with superuser permission, will receive EPERM.
RETURN VALUE
setup() always returns -1 for a user process.
ERRORS
EPERM Always, for a user process.
VERSIONS
Since Linux 2.1.121, no such function exists anymore.
CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable, or indeed in any programs at all.
NOTES
The calling sequence varied: at some times setup () has had a single argument void *BIOS and at other times a single argument int magic.
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2008-12-03 SETUP(2)


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