Is there a way to exit a program with a non-zero return code?

[mortax]

I can't find anything in Mojo equivalent to:

import sys

sys.exit(13)

Am I just missing it?

[rarebreed]

So, until mojo makes this more friendly, you will need to make a System Call to do this.

# nonzero.mojo
from sys.intrinsics import external_call

fn main() raises:
    external_call["exit", Int, Int](20)

~/Projects/anting via 🐍 v3.10.13 (.venv) 
❯ : mojo build nonzero.mojo
/home/stoner/Projects/anting/nonzero.mojo:4:36: warning: 'Int' value is unused
    external_call["exit", Int, Int](20)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
    _ = 

Then you can run it

➜  ./nonzero
➜  echo $?  
20

Took me awhile to figure out that mojo requires def main() or fn main() to return None. The external_call is mojo's way to let you make a libc call under the hood.

[mortax]

ah ha. nice. i tried doing it through Python but that didn't actually do anything do to the way it's wrapped (i presume).

i knew there must be some (possibly non-beautiful) way to do it. that worked perfectly, thanks!