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A program can say how it went

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SWI osExit takes a status in A, and the shell keeps it. Fifty eight exits
across twenty three programs now say deliberately whether they worked: 25
did what they were asked, 24 did not, 9 were asked wrongly. Compare is the
exception and says so - one there means the files differ, which is a result
rather than a failure, the way diff has always had it.

IN A RATHER THAN Q, which is not a departure from the rule that a service
answers in Q. This one takes an ARGUMENT, the way osPrintNumber takes A and
B, and it never returns to answer anything. A is free precisely because a
return would have put it back - and Q is the ALU's output, so a small
number costs four instructions there against one in A.

The shell does not print it. A program that failed has already said so in
words and a number beside that is noise, so osLastStatus hands it back and
Status is the program that shows it. That indirection is the point: the
number exists for the thing that cannot read words.

MARKING THE EXITS FOUND A DEFECT ON THE FIRST RUN. Type and More printed
why they had failed and then fell through into the success exit, reporting
that all was well. Nobody had noticed, because while the only reader was a
person, the person could see both the complaint and the claim.

Two smaller things. Snake sets the console to line mode and then exits with
zero, and the linter flagged the second RSTA as redundant - an exit status
and a console mode, equal by accident, which is the class that must never
be collapsed. And the README still taught answering by writing into the
frame, three months of habit that SRET replaced yesterday; that section is
gone and the one describing SRET stands in its place.
This commit is contained in:
Anachronaut
2026-08-27 19:16:21 -04:00
parent b4206673a6
commit 87d819847e
40 changed files with 297 additions and 47 deletions
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Programs/CosmOS/Source/services.asm
+14
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@@ -153,3 +153,17 @@
; about something the loader has no way to check.
osBootState 0d33
osBootSettle 0d34
; ---- What a program made of it ----
;
; osExit takes a status in A: zero if the program did what it was asked, and a number of
; its own choosing if it did not. IN A RATHER THAN Q, which is not a departure from the
; rule that a service answers in Q - this one takes an argument, the way osPrintNumber
; does, and never returns to answer anything. A is free precisely because a return would
; have put it back, and Q is the ALU's output, so a small number costs four instructions
; there and one in A.
;
; osLastStatus answers in Q with what the last program exited with. The shell does not
; print it: a program that failed has already said so in words, and a number beside that
; would be noise. This is for the thing that cannot read words.
osLastStatus 0d35