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    SubjectRe: how to restart userland?
    On Mon, 3 Nov 2003, Tomas Szepe wrote:

    > Hi,
    >
    > Would anyone know of a proven way to completely restart the userland
    > of a Linux system?
    >
    > i.e. something like
    > # echo whatever-restart >/proc/wherever
    >
    > Killing all processes.
    > Killing init.
    > Unmounting all filesystems.
    > VFS: Mounted root (ext2 filesystem).
    > INIT: v2.84 booting
    > ...
    >
    > Thanks for any pointers,
    > --
    > Tomas Szepe <szepe@pinerecords.com>
    > -

    If you have an 'old' sys-V installation, you as root can execute
    `init 0`. Then, after everything has stopped, you can execute
    `init 5` or `init 6` to restart to the runlevel you had. More
    modern versions from (probably all) distributions won't allow
    this. But... you may be able to make a script. The problem is
    in fooling init to start all over again. You really need to modify
    init (perhaps runlevel 10) to, after everything is unmounted and
    all the gettys are killed, do:

    char *argv[3];
    argv[0] ="/sbin/init";
    argv[1] ="auto";
    argv[2] = NULL;
    execve(argv[0], argv, __environ);

    That will overlay and restart init from scratch.


    Cheers,
    Dick Johnson
    Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
    Note 96.31% of all statistics are fiction.


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