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Re: Freestanding Environment

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From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Freestanding Environment
Date Tue, 20 Jun 2017 08:32:47 -0700
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David Kleinecke <dkleinecke@gmail.com> writes:
> On Monday, June 19, 2017 at 9:11:07 AM UTC-7, Keith Thompson wrote:
[...]
>> 5.1.2.1 of the current C11 standard says:
>> 
>>     In a freestanding environment (in which C program execution
>>     may take place without any benefit of an operating system),
>>     the name and type of the function called at program startup are
>>     implementation-defined. Any library facilities available to a
>>     freestanding program, other than the minimal set required by
>>     clause 4, are implementation-defined.
>> 
>>     The effect of program termination in a freestanding environment
>>     is implementationdefined.
>> 
>> The phrase "*the* function called at program startup" seems to me to
>> imply that there is one such function for a given implementation.
>> It might not be called "main", and it might have different type
>> than the main function used by a hosted implementation.
>> 
>> On the other hand, if an implementation lets the programmer configure
>> the identify of the startup function, I don't think that would be
>> a conformance problem, as long as it's documented.
>
> That is my reading, too.
>
> Hence where to start is externally-supplied information

How do you get "externally-supplied" from what I wrote?  External
relative to what?

For example, a conforming freestanding implementation might say:

    The function called at program startup is named "Startup", and is
    defined as:

        void Startup(void) { /* ... */ }

and provide no mechanism to use a different startup function.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-17 19:58 -0700
  Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-18 00:15 -0500
    Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-17 23:51 -0700
      Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-18 02:31 -0500
        Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-18 14:08 -0700
          Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-18 21:19 -0500
            Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-18 19:49 -0700
              Re: Freestanding Environment Keith Thompson <kst-u@mib.org> - 2017-06-19 09:10 -0700
                Re: Freestanding Environment supercat@casperkitty.com - 2017-06-19 09:42 -0700
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-19 16:51 +0000
                Re: Freestanding Environment supercat@casperkitty.com - 2017-06-19 12:26 -0700
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-19 19:37 +0000
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-19 17:51 -0700
                Re: Freestanding Environment Keith Thompson <kst-u@mib.org> - 2017-06-19 12:39 -0700
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-19 17:45 -0700
                Re: Freestanding Environment Keith Thompson <kst-u@mib.org> - 2017-06-20 08:32 -0700
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-20 12:29 -0700
                Re: Freestanding Environment raltbos@xs4all.nl (Richard Bos) - 2017-06-26 15:58 +0000
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-26 09:25 -0700
                Re: Freestanding Environment raltbos@xs4all.nl (Richard Bos) - 2017-06-26 20:17 +0000
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-26 14:03 -0700
                Re: Freestanding Environment joel.rees@gmail.com - 2017-06-27 18:04 -0700
                Re: Freestanding Environment James Kuyper <jameskuyper@verizon.net> - 2017-06-27 21:47 -0400
                Re: Freestanding Environment bartc <bc@freeuk.com> - 2017-06-28 11:45 +0100
                Re: Freestanding Environment Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-28 03:55 -0700
                Re: Freestanding Environment Richard Heathfield <rjh@cpax.org.uk> - 2017-06-28 12:32 +0100
                Re: Freestanding Environment Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-28 05:45 -0700
                Re: Freestanding Environment James Harris <james.harris.1@gmail.com> - 2017-06-28 21:42 +0100
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-29 13:27 +0000
                Re: Freestanding Environment Mark Storkamp <mstorkamp@yahoo.com> - 2017-06-29 08:44 -0500
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-29 13:54 +0000
                Re: Freestanding Environment Mark Storkamp <mstorkamp@yahoo.com> - 2017-06-29 11:11 -0500
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-29 16:45 +0000
                Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-30 00:34 -0500
                Re: Freestanding Environment Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-29 16:07 -0400
                Re: Freestanding Environment James Kuyper <jameskuyper@verizon.net> - 2017-06-28 16:53 -0400
                Re: Freestanding Environment James Harris <james.harris.1@gmail.com> - 2017-06-29 10:58 +0100
                Re: Freestanding Environment "James R. Kuyper" <jameskuyper@verizon.net> - 2017-06-29 12:19 -0400
                Re: Freestanding Environment James Harris <james.harris.1@gmail.com> - 2017-06-30 08:16 +0100
                Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-28 11:28 -0500
                Re: Freestanding Environment James Kuyper <jameskuyper@verizon.net> - 2017-06-28 14:38 -0400
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-28 18:48 +0000
                Re: Freestanding Environment Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-26 16:42 -0400
                Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-26 14:05 -0700
                Re: Freestanding Environment Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-26 17:31 -0400
                Re: Freestanding Environment joel.rees@gmail.com - 2017-06-27 02:36 -0700
                Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-27 12:43 +0000
                Re: Freestanding Environment Robert Wessel <robertwessel2@yahoo.com> - 2017-06-27 09:50 -0500
                Re: Freestanding Environment joel.rees@gmail.com - 2017-06-27 18:11 -0700
            Re: Freestanding Environment "Patrick.Schluter" <Patrick.Schluter@free.fr> - 2017-06-20 20:22 +0200
              Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-20 12:33 -0700
          Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-19 13:11 +0000
          Re: Freestanding Environment Mark Storkamp <mstorkamp@yahoo.com> - 2017-06-19 08:53 -0500
      Re: Freestanding Environment scott@slp53.sl.home (Scott Lurndal) - 2017-06-19 13:08 +0000
        Re: Freestanding Environment David Kleinecke <dkleinecke@gmail.com> - 2017-06-19 17:40 -0700
    Re: Freestanding Environment Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-19 04:16 -0700
  Re: Freestanding Environment supercat@casperkitty.com - 2017-06-19 07:59 -0700

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