setup() is called once from within linux/init/main.c. It calls ini-
tialization 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.
setup() always returns -1 for a user process.
EPERM Always, for a user process.
Since Linux 2.1.121, no such function exists anymore.
This function is Linux-specific, and should not be used in programs
intended to be portable, or indeed in any programs at all.
The calling sequence varied: at some times setup () has had a single
argument void *BIOS and at other times a single argument int magic.
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
Linux 2008-12-03 SETUP(2)
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