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rfc: script exit value from ENTRY-POINT retval
From: |
Thien-Thi Nguyen |
Subject: |
rfc: script exit value from ENTRY-POINT retval |
Date: |
Thu, 22 Jul 2010 11:00:16 +0200 |
In Guile 1.4.x, i just installed this:
* for scripts with -e ENTRY-POINT, exit value is ENTRY-POINT retval
Previously, ENTRY-POINT retval was ignored; scripts would always exit
successfully (exit value of zero) unless ‘exit’ was called explicitly.
This change is backward compatible if you explicitly call ‘exit’;
there is no change in behavior. On the other hand, if ENTRY-POINT
blithely returns #f or a non-zero integer, that value is no longer
masked; the script will now exit failurefully.
This change removes the small but gratuitous conceptual discrepency
between C ‘main’ and Scheme ENTRY-POINT, making ENTRY-POINT easier to
use internally, generally (caller no longer needs to catch ‘quit’).
In Guile 1.4.x, all scripts/* programs use ‘HVQC-MAIN’, which does
‘exit’ explicitly. The other big corpus of scripts i have experience
with is ttn-do, which used to use ‘HVQC-MAIN’, but now (with the intent
of porting to Guile 2) uses a simpler mechanism that generally does NOT
do ‘exit’ explicitly.
What do people think of making this change in Guile 2.x and 1.8.x?
(Included in the change would be an audit/update of bundled scripts.)
thi
- rfc: script exit value from ENTRY-POINT retval,
Thien-Thi Nguyen <=