On Tue, 14 Nov 2006, Matthew Woehlke wrote:
Thomas Dickey wrote:
On Mon, 13 Nov 2006, Paul Eggert wrote:
If they conform to C89 there should be no problem. In C89, returning
N from 'main' is like 'exit(N)'. This thread is about pre-C89 systems
where the return value from 'main' is mangled.
For example (reading the comments that you made earlier, perhaps you should
learn something old about C89):
In that case, it sounds like we should suggest to people that they use
the POSIX environment rather than try to port to a C-only environment.
But I am surprised that a C-only environment would mess up in this
way, even on mainframes.
VMS, where an application can return EXIT_SUCCESS or EXIT_FAILURE from main
- but (still complying with C89), those are not 0 and 1 respectively.
Isn't that exactly what I said? :-) (I even used VMS...) You may want to
re-read the thread; I think the consensus was that this is a different issue.
I read it, didn't care for the response. But since you ask:
hmm - VAX's were introduced as large minicomputers (if you're
thinking that everthing bigger than a PC is a mainframe, I
suppose that's a reflection of when you picked up the term).
VMS uses more than one value for success - typical applications
add a mask to quiet messages on exit. There's also a field used
to specify a message to associate with the code. But as noted,
EXIT_SUCCESS and EXIT_FAILURE are defined properly for ISO C
applications.
It doesn't need exit. No point in commenting if all you can say
is "maybe".
"has to deal" sounds like the sort of comments that Eggert makes -
which caught my attention on this list. A shame, when a few
moments reading on the web would have answered the question.
quote from the referenced message:
Hmm, mainframes? I want to say VMS also uses 'return 1' for success (or
maybe it even needs exit; I'm not the one that has to deal with our VMS
systems). But as I recall VMS doesn't have a POSIX shell either. Is there
any VMS support that anyone is worried about?
--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net
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