setup - setup devices and filesystems, mount root filesystem

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.

EPERM Always, for a user process.

Standard C library (libc, -lc)

setup - setup devices and filesystems, mount root filesystem

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

Linux.

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 intmagic. Linux man-pages 6.9.1 2024-05-02 setup(2)