Re: Which exception for a buffer overrun?

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From	Keith Thompson <kst-u@mib.org>
Newsgroups	comp.lang.c++
Subject	Re: Which exception for a buffer overrun?
Date	Wed, 16 Oct 2019 15:34:52 -0700
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Paavo Helde <myfirstname@osa.pri.ee> writes:
> On 16.10.2019 0:59, Soviet_Mario wrote:
>> One thing I really can't stand is the way C used to share a single
>> variable (errno) to store status, that may be overwritten unpredictably
>
> It's not a single variable, it's a single variable per thread.

Right.  The standard says errno is a macro "which expands to a
modifiable lvalue that has type int and thread local storage duration,
the value of which is set to a positive error number by several library
functions".

On my system, the errno macro expands to
    (*__errno_location ())
where the __errno_location function presumably returns a pointer to a
thread-local int object.

This was introduced in C11.  In C90 and C99, thread local storage did
not exist, but implementations could do something equivalent.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */

Thread

Which exception for a buffer overrun? Frederick Gotham <cauldwell.thomas@gmail.com> - 2019-10-15 03:00 -0700
  Re:Which exception for a buffer overrun? melzzzzz <mel@melzzzzz.com> - 2019-10-15 12:52 +0200
    Re: Re:Which exception for a buffer overrun? queequeg@trust.no1 (Queequeg) - 2019-10-16 12:52 +0000
      Re: Re:Which exception for a buffer overrun? melzzzzz <mel@melzzzzz.com> - 2019-10-16 18:29 +0200
  Re: Which exception for a buffer overrun? Paavo Helde <myfirstname@osa.pri.ee> - 2019-10-15 13:54 +0300
    Re: Which exception for a buffer overrun? Frederick Gotham <cauldwell.thomas@gmail.com> - 2019-10-15 04:08 -0700
      Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-15 13:57 +0200
        Re: Which exception for a buffer overrun? Soviet_Mario <SovietMario@CCCP.MIR> - 2019-10-15 23:59 +0200
          Re: Which exception for a buffer overrun? scott@slp53.sl.home (Scott Lurndal) - 2019-10-15 22:13 +0000
            Re: Which exception for a buffer overrun? Soviet_Mario <SovietMario@CCCP.MIR> - 2019-10-16 15:04 +0200
          Re: Which exception for a buffer overrun? Paavo Helde <myfirstname@osa.pri.ee> - 2019-10-16 07:57 +0300
            Re: Which exception for a buffer overrun? Soviet_Mario <SovietMario@CCCP.MIR> - 2019-10-16 15:05 +0200
            Re: Which exception for a buffer overrun? Keith Thompson <kst-u@mib.org> - 2019-10-16 15:34 -0700
          Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-16 10:16 +0200
            Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-16 05:54 -0700
              Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-16 16:12 +0200
                Re: Which exception for a buffer overrun? Soviet_Mario <SovietMario@CCCP.MIR> - 2019-10-16 20:45 +0200
                Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-17 06:34 -0700
                Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-17 16:34 +0200
            Re: Which exception for a buffer overrun? Ian Collins <ian-news@hotmail.com> - 2019-10-17 08:15 +1300
              Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-16 23:00 +0200
                Re: Which exception for a buffer overrun? Ian Collins <ian-news@hotmail.com> - 2019-10-17 10:36 +1300
                Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-17 10:14 +0200
                Re: Which exception for a buffer overrun? Daniel <danielaparker@gmail.com> - 2019-10-16 20:06 -0700
            Re: Which exception for a buffer overrun? Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-18 09:45 +0200
        Re: Which exception for a buffer overrun? Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-17 21:22 +0200
      Re: Which exception for a buffer overrun? Paavo Helde <myfirstname@osa.pri.ee> - 2019-10-15 17:48 +0300
    Re: Which exception for a buffer overrun? "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2019-10-15 13:09 +0200
      Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-15 13:35 +0200
        Re: Which exception for a buffer overrun? scott@slp53.sl.home (Scott Lurndal) - 2019-10-15 13:30 +0000
      Re: Which exception for a buffer overrun? melzzzzz <mel@melzzzzz.com> - 2019-10-15 13:49 +0200
        Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-15 13:59 +0200
      Re: Which exception for a buffer overrun? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-15 14:48 +0000
        Re: Which exception for a buffer overrun? Paavo Helde <myfirstname@osa.pri.ee> - 2019-10-15 18:37 +0300
          Re: Which exception for a buffer overrun? melzzzzz <mel@melzzzzz.com> - 2019-10-15 18:48 +0200
      Re: Which exception for a buffer overrun? queequeg@trust.no1 (Queequeg) - 2019-10-16 13:00 +0000
    Re: Which exception for a buffer overrun? Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-10-15 18:21 +0100
      Re: Which exception for a buffer overrun? Melzzzzz <Melzzzzz@zzzzz.com> - 2019-10-15 20:32 +0000
        Re: Which exception for a buffer overrun? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-16 06:20 +0000
    Re: Which exception for a buffer overrun? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-10-16 14:43 -0700
  Re: Which exception for a buffer overrun? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-15 11:12 +0000
  Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-15 13:44 -0700
    Re: Which exception for a buffer overrun? Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-10-15 22:43 +0100
      Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-16 00:01 -0700
        Re: Which exception for a buffer overrun? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-16 19:02 +0000
          Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-16 15:22 -0700
            Re: Which exception for a buffer overrun? Mike Terry <news.dead.person.stones@darjeeling.plus.com> - 2019-10-17 03:31 +0100
              Re: Which exception for a buffer overrun? Ian Collins <ian-news@hotmail.com> - 2019-10-17 15:35 +1300
                Re: Which exception for a buffer overrun? David Brown <david.brown@hesbynett.no> - 2019-10-17 10:17 +0200
            Re: Which exception for a buffer overrun? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-20 22:18 +0000
              Re: Which exception for a buffer overrun? Öö Tiib <ootiib@hot.ee> - 2019-10-21 04:06 -0700

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