Exit Status (Exit Code)

Is it possible to set the exit status of Singular process to be the return value of certain procedure.
e.g
// File code.sing
proc abc()
{
return(123);
}

abc();
// EOF code.sing

$ > Singular < code.sing
123
>
$ > echo $?
0

I want to set 123 as an answer to this!! How do I set this? I have tried giving return_value of the proc to exit, but it didnt work.
proc abc()
{
return(123);
}
int ret = abc();
exit(ret);

I hope I have made myself clear enough.
Thanks,

VInay

Sorry, you cannot set the exit code from within Singular.
In general: non-zero is some kind of crash (out of memroy etc.).

Hans Schoenemann