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SETUP(2) Linux Programmer's Manual SETUP(2)
NAME
setup - setup devices and filesystems, mount root filesystem
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 filesystems configured into the kernel and then mounts
the root filesystem.
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.
Linux 2021-03-22 SETUP(2)