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Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type?

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On Thu, 03 May 2012 16:12:50 -0400, James Kuyper wrote:

> You left out another important context: signal handlers. In fact, until
> C2011 added working about threading, signal handlers were the only
> purely internal C reason for needing volatile; all of the other possible
> reasons were outside the scope of the standard.

Not quite; volatile is also meaningful in conjunction with setjmp/longjmp.
7.13.2.1p3 says:

       [#3] All accessible objects  have  values  as  of  the  time
       longjmp  was  called,  except  that the values of objects of
       automatic storage duration that are local  to  the  function
       containing  the invocation of the corresponding setjmp macro
       that do not  have  volatile-qualified  type  and  have  been
       changed  between  the setjmp invocation and longjmp call are
       indeterminate.

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Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-02 09:06 -0700
  Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? "In a very dark China Blue, China Blue condition." <chine.bleu@yahoo.com> - 2012-05-02 09:33 -0700
  Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-02 12:36 -0400
    Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-02 10:04 -0700
      Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-02 13:23 -0400
    Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 09:20 -0700
      Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 09:25 -0700
        Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 10:16 -0700
        Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 11:05 -0700
        Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-03 15:21 -0400
      Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 09:46 -0700
      Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Nobody <nobody@nowhere.com> - 2012-05-03 19:14 +0100
        Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 11:45 -0700
          Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Jens Gustedt <jens.gustedt@loria.fr> - 2012-05-03 21:05 +0200
            Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 12:14 -0700
            Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-03 15:16 -0400
              Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Lanarcam <lanarcam1@yahoo.fr> - 2012-05-03 21:56 +0200
                Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-03 16:12 -0400
                Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 13:45 -0700
                Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Nobody <nobody@nowhere.com> - 2012-05-04 01:34 +0100
              Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Jens Gustedt <jens.gustedt@loria.fr> - 2012-05-03 22:32 +0200
            Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 12:10 -0700
              Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Keith Thompson <kst-u@mib.org> - 2012-05-03 16:14 -0700
            Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Tim Rentsch <txr@alumni.caltech.edu> - 2012-05-07 17:24 -0700
          Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-03 15:19 -0400
            Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? John Reye <jononanon@googlemail.com> - 2012-05-03 12:25 -0700
      Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-03 17:44 -0400
  Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Barry Schwarz <schwarzb@dqel.com> - 2012-05-02 12:35 -0700
    Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-05-02 14:40 -0700
    Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? James Kuyper <jameskuyper@verizon.net> - 2012-05-02 17:51 -0400
    Re: Can *common* struct-members of 2 different struct-types, that are the same for the first common members, be accessed via pointer cast to either struct-type? Tim Rentsch <txr@alumni.caltech.edu> - 2012-05-07 17:16 -0700

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