Re: Reason for segmentation violation

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.c
Subject	Re: Reason for segmentation violation
Date	2015-06-12 09:41 +0000
Organization	Aioe.org NNTP Server
Message-ID	<mle9gd$dlt$1@speranza.aioe.org> (permalink)
References	(2 earlier) <b5ef8bf1-2e74-4d78-b69e-2ccd12f7eccd@googlegroups.com> <aehjna51mdp2kdvi22q5em5k979m5gr0j1@4ax.com> <f4c57e09-7ff9-46ad-85ba-e032442a9192@googlegroups.com> <b7hkna9ee41jvrqejb2q9ncta2iuhchsag@4ax.com> <df87df99-138c-4f76-b6fc-02f890dd778b@googlegroups.com>

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Morten W. Petersen <morphex@gmail.com> wrote:

(snip)
> When it comes to realloc, looking at that function one can tell 
> that realloc will keep the memory segment at the same size or 
> reduce it.  
> What are the chances that such a call to realloc will fail?

If I tell you, will you program differently?

If it is 1% or 10%?

As far as I know, most unix-like systems have the ability to reduce
the size of an allocated block. 

C tries to be general enough, and it might be that some systems
have to allocate new space and copy the data, even to reduce the
size, and it could fail on those systems.  Do you know that your
program will never run on one of those?

-- glen

Thread

Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-10 22:32 -0700
  Re: Reason for segmentation violation Xavier Roche <xroche@free.fr.NOSPAM.invalid> - 2015-06-11 07:52 +0200
    Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-11 07:19 -0700
      Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-11 15:46 +0100
      Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-11 11:23 -0700
        Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-11 12:08 -0700
          Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-11 15:44 -0400
            Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-11 12:55 -0700
              Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-11 16:29 -0400
              Re: Reason for segmentation violation gordonb.h0fbo@burditt.org (Gordon Burditt) - 2015-06-17 23:51 -0500
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-17 23:10 -0700
                Re: Reason for segmentation violation gordonb.0vo9r@burditt.org (Gordon Burditt) - 2015-06-18 03:30 -0500
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-18 02:40 -0700
          Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-11 21:00 +0100
          Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-11 19:58 -0700
            Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-11 23:42 -0700
              Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-12 08:33 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-12 02:36 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-12 11:07 +0100
                Re: Reason for segmentation violation gwowen <gwowen@gmail.com> - 2015-06-12 04:55 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-12 13:17 +0100
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-12 13:32 +0100
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-12 13:20 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-13 23:55 -0700
                Restrictions on inline functions (Was: Reason for segmentation violation) Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-14 10:30 +0100
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-12 11:10 -0400
                Re: Reason for segmentation violation David Thompson <dave.thompson2@verizon.net> - 2015-06-21 12:46 -0400
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-12 08:35 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-12 12:21 -0400
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-12 10:48 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-12 19:12 +0100
                Re: Reason for segmentation violation David Kleinecke <dkleinecke@gmail.com> - 2015-06-12 08:49 -0700
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-12 09:13 -0700
                Re: Reason for segmentation violation David Kleinecke <dkleinecke@gmail.com> - 2015-06-13 08:55 -0700
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-12 08:56 -0700
              Re: Reason for segmentation violation glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-06-12 09:41 +0000
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-12 08:29 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 00:03 -0700
                Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-14 00:58 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 02:14 -0700
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-14 04:26 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 06:29 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-14 15:06 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 07:25 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-14 16:59 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 11:51 -0700
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-14 16:43 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 14:16 -0700
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-14 20:35 -0400
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-15 01:19 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 03:57 -0700
                Re: Reason for segmentation violation Bartc <bc@freeuk.com> - 2015-06-15 12:26 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 04:47 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-15 15:02 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 07:08 -0700
                Re: Reason for segmentation violation Bartc <bc@freeuk.com> - 2015-06-15 18:56 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 20:09 -0700
                Re: Reason for segmentation violation Bartc <bc@freeuk.com> - 2015-06-16 09:31 +0100
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-16 10:09 +0100
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-16 02:36 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-16 11:01 +0100
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-16 12:37 +0100
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-16 08:40 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-16 10:32 -0700
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-17 07:54 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 05:28 -0700
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-18 00:34 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 09:13 +0200
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-19 21:17 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-20 23:28 +0200
                Re: Reason for segmentation violation "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-06-15 05:26 -0700
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-15 06:20 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-15 14:25 +0100
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-15 07:52 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-15 18:29 +0100
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-15 11:15 -0700
                Re: Reason for segmentation violation raltbos@xs4all.nl (Richard Bos) - 2015-06-18 20:41 +0000
                Re: Reason for segmentation violation Bartc <bc@freeuk.com> - 2015-06-15 18:48 +0100
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-15 11:04 -0700
                Re: Reason for segmentation violation raltbos@xs4all.nl (Richard Bos) - 2015-06-18 20:44 +0000
                Re: Reason for segmentation violation David Brown <david.brown@hesbynett.no> - 2015-06-19 10:39 +0200
                Re: Reason for segmentation violation gwowen <gwowen@gmail.com> - 2015-06-16 00:58 -0700
                Re: Reason for segmentation violation raltbos@xs4all.nl (Richard Bos) - 2015-06-18 20:40 +0000
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-18 17:06 -0400
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-18 14:56 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-18 23:04 +0100
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-18 18:18 -0400
                Re: Reason for segmentation violation David Brown <david.brown@hesbynett.no> - 2015-06-19 10:26 +0200
                Re: Reason for segmentation violation David Kleinecke <dkleinecke@gmail.com> - 2015-06-19 08:57 -0700
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-15 08:54 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 06:24 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-15 14:32 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 05:43 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-14 23:28 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 16:31 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-15 01:27 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 05:34 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-15 15:00 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 20:37 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-16 09:58 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-16 10:37 -0700
                Re: Reason for segmentation violation luser droog <luser.droog@gmail.com> - 2015-06-15 17:51 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 21:02 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-16 00:51 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-15 22:30 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-17 00:35 -0400
                Re: Reason for segmentation violation Rosario19 <Ros@invalid.invalid> - 2015-06-19 18:51 +0200
                Re: Reason for segmentation violation luser droog <luser.droog@gmail.com> - 2015-06-15 22:40 -0700
                Re: Reason for segmentation violation luser droog <luser.droog@gmail.com> - 2015-06-15 23:23 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-16 11:07 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-16 23:54 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 10:51 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 03:46 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 04:17 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 14:02 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 06:15 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 15:34 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 07:58 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 16:04 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 08:16 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 14:57 +0200
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-18 15:35 +0100
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-18 15:44 +0100
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-18 08:18 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-18 16:42 +0100
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 08:19 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 16:35 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 08:49 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-17 11:56 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 09:46 +0200
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 09:14 -0700
                Re: Reason for segmentation violation gordonb.446bm@burditt.org (Gordon Burditt) - 2015-06-18 01:56 -0500
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 09:54 +0200
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 09:08 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-22 16:53 +0200
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-22 16:32 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-22 18:21 +0200
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-22 16:33 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-22 18:20 +0200
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-22 13:05 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-22 19:47 +0200
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 13:52 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 06:05 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 15:39 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 08:02 -0700
                Re: Reason for segmentation violation Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-17 16:12 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 10:46 +0200
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-17 16:12 +0100
                Re: Reason for segmentation violation Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-11 08:28 -0700
                Re: Reason for segmentation violation Ian Collins <ian-news@hotmail.com> - 2015-06-18 07:32 +1200
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 22:02 +0200
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 13:16 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 22:32 +0200
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-23 06:52 +0200
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-17 16:16 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 22:44 +0200
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-17 17:39 -0400
                Re: Reason for segmentation violation Robert Wessel <robertwessel2@yahoo.com> - 2015-06-18 01:57 -0500
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 09:29 +0200
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-17 13:57 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 23:10 +0200
                Re: Reason for segmentation violation Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-17 14:22 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 23:41 +0200
                Re: Reason for segmentation violation Richard Damon <Richard@Damon-Family.org> - 2015-06-18 00:40 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-18 09:18 +0200
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 08:52 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-17 09:27 -0700
                Re: Reason for segmentation violation Keith Thompson <kst-u@mib.org> - 2015-06-17 11:00 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 07:48 -0700
                Re: Reason for segmentation violation Bartc <bc@freeuk.com> - 2015-06-14 16:53 +0100
                Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-14 10:59 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 11:45 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-14 20:01 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 12:40 -0700
                Re: Reason for segmentation violation Richard Heathfield <rjh@cpax.org.uk> - 2015-06-14 21:00 +0100
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 13:13 -0700
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 13:17 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-14 16:36 -0400
                Re: Reason for segmentation violation "Morten W. Petersen" <morphex@gmail.com> - 2015-06-14 13:43 -0700
                Re: Reason for segmentation violation James Kuyper <jameskuyper@verizon.net> - 2015-06-14 14:50 -0400
              Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-12 03:21 -0700
  Re: Reason for segmentation violation Barry Schwarz <schwarzb@dqel.com> - 2015-06-10 23:07 -0700

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