Arch Linux

idang1410

Member

Registered: 2020-03-01

Posts: 7

[SOLVED] reboot is symlink

Hey everyone

I don't have a problem i need to fix, I encountered something I couldn't explain.
As you know the commands halt. reboot, shutdown are symlinks to systemctl (on systemd machines).
But I don't understand how systemctl know how to act. It's not like the symlink has additional data like command to run. It's just pointer to systemctl.
So how systemctl knows to do the proper action?

Last edited by idang1410 (2020-07-08 09:42:37)

Mr.Elendig

#archlinux@freenode channel op

From: The intertubes

Registered: 2004-11-07

Posts: 4,097

Re: [SOLVED] reboot is symlink

It checks argv[0] and acts depending on what it says. It is quite common to do this, eg kmod and vim does the same.

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idang1410

Member

Registered: 2020-03-01

Posts: 7

Re: [SOLVED] reboot is symlink

It checks argv[0] and acts depending on what it says. It is quite common to do this, eg kmod and vim does the same.

It makes sense. It's also in the source code (I checked just now)
Thanks