setup(2) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | COLOPHON

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

NAME         top

       setup - setup devices and filesystems, mount root filesystem

SYNOPSIS         top

       #include <unistd.h>

       int setup(void);

DESCRIPTION         top

       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         top

       setup() always returns -1 for a user process.

ERRORS         top

       EPERM  Always, for a user process.

VERSIONS         top

       Since Linux 2.1.121, no such function exists anymore.

CONFORMING TO         top

       This function is Linux-specific, and should not be used in
       programs intended to be portable, or indeed in any programs at
       all.

NOTES         top

       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         top

       This page is part of release 5.11 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

Linux                          2021-03-22                       SETUP(2)

Pages that refer to this page: syscalls(2)