setup(2) System Calls Manual setup(2)

setup - setup devices and filesystems, mount root filesystem

Standard C library (libc, -lc)

#include <unistd.h>
[[deprecated]] int setup(void);

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.

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

Always, for a user process.


Removed in Linux 2.1.121.

The calling sequence varied: at some times setup() has had a single argument void *BIOS and at other times a single argument int magic.

2024-05-02 Linux man-pages 6.8