Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Fread problem |
| Date | 2011-07-16 21:39 +1200 |
| Message-ID | <98d4lcFv3qU11@mid.individual.net> (permalink) |
| References | <ivq9i7$841$1@speranza.aioe.org> <ivqcap$eqo$1@reader1.panix.com> <ivrl7v$3gb$1@speranza.aioe.org> |
On 07/16/11 09:22 PM, Jack wrote: > On Fri, 15 Jul 2011 21:43:53 +0000, John Gordon wrote: >> In<ivq9i7$841$1@speranza.aioe.org> Jack<spamtrap@trashcan.invalid> >> writes: >> >>> I got a strange problem with Fread: >> >>> It crashes my program from time to time, in one of its internal memcpy >>> calls. >> >> When things like this happen it is nearly always because of a memory >> corruption bug elsewhere in your program, not because of a bug in a >> library function like fread(). >> >> C is, unfortunately, a fragile language. If you copy more to a buffer >> than it can hold, or call free() on a bad value, or call free() twice on >> the same value, you've just corrupted the memory space of your program >> and anything can happen from that point onward, including crashes in >> library functions such as fread(). >> >> If your program is a simple one, go over it again and try to identify >> any areas where you might have committed the above errors. If it's a >> complex program, you might use a memory analyzer such as efence or >> valgrind. > > Yes... > Actually, I think it's a memory error somewhere that causes really > indirectly this bug. So try valgrind... > But I find it strange that even a memory error makes a fread with proper > parameters ( I do check this ) fail. Why strange? All the memory is in one address space, so any part of the program can mess with the buffers being used by stdio. -- Ian Collins
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Fread problem Jack <spamtrap@trashcan.invalid> - 2011-07-15 20:56 +0000
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-16 09:05 +1200
Re: Fread problem Noob <root@127.0.0.1> - 2011-07-19 13:41 +0200
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-15 21:43 +0000
Re: Fread problem Jack <spamtrap@trashcan.invalid> - 2011-07-16 09:22 +0000
Re: Fread problem Dr Nick <3-nospam@temporary-address.org.uk> - 2011-07-16 10:25 +0100
Re: Fread problem Jack <spamtrap@trashcan.invalid> - 2011-07-16 20:23 +0000
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-17 08:37 +1200
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-16 20:46 +0000
Re: Fread problem James Kuyper <jameskuyper@verizon.net> - 2011-07-16 18:29 -0400
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-16 23:14 +0000
Re: Fread problem Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-16 16:55 -0400
Re: Fread problem blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-07-19 17:17 +0000
[OT] Re: Fread problem Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-19 20:11 -0400
Re: [OT] Re: Fread problem Seebs <usenet-nospam@seebs.net> - 2011-07-20 02:27 +0000
Re: Fread problem Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-07-16 14:57 -0600
Re: Fread problem Jack <spamtrap@trashcan.invalid> - 2011-07-17 20:45 +0000
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-18 08:50 +1200
Re: Fread problem James Kuyper <jameskuyper@verizon.net> - 2011-07-17 17:06 -0400
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-18 09:09 +1200
Re: Fread problem Hans Vlems <hvlems@freenet.de> - 2011-07-18 13:01 -0700
Re: Fread problem Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-07-17 16:06 -0600
Re: Fread problem Geoff <geoff@invalid.invalid> - 2011-07-17 17:56 -0700
Re: Fread problem Seebs <usenet-nospam@seebs.net> - 2011-07-18 04:08 +0000
Re: Fread problem Geoff <geoff@invalid.invalid> - 2011-07-17 22:08 -0700
Re: Fread problem Jack <spamtrap@trashcan.invalid> - 2011-07-18 20:20 +0000
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-19 08:50 +1200
Re: Fread problem Cat 22 <cat22@invalid.org> - 2011-07-18 18:34 -0700
Re: Fread problem James Kuyper <jameskuyper@verizon.net> - 2011-07-19 07:19 -0400
Re: Fread problem Stephen Sprunk <stephen@sprunk.org> - 2011-07-19 09:31 -0500
Re: Fread problem Todd Carnes <toddcarnes@gmail.com> - 2011-07-18 04:23 +0000
Re: Fread problem Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-07-18 01:15 -0700
Re: Fread problem Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-18 07:22 -0400
Re: Fread problem Kenneth Brody <kenbrody@spamcop.net> - 2011-07-18 13:56 -0400
Re: Fread problem Kenneth Brody <kenbrody@spamcop.net> - 2011-07-18 13:49 -0400
Re: Fread problem Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-18 20:31 -0400
Re: Fread problem Squeamizh <squeamz@hotmail.com> - 2011-07-18 21:11 -0700
Re: Fread problem blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-07-19 17:19 +0000
Re: Fread problem Kenneth Brody <kenbrody@spamcop.net> - 2011-07-19 14:18 -0400
Re: Fread problem pete <pfiland@mindspring.com> - 2011-07-19 15:19 -0400
Re: Fread problem blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-07-19 21:33 +0000
Re: Fread problem Geoff <geoff@invalid.invalid> - 2011-07-16 14:27 -0700
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-16 22:22 +0000
Re: Fread problem "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-07-16 23:28 -0700
Re: Fread problem "J. J. Farrell" <jjf@bcs.org.uk> - 2011-07-18 04:58 +0100
Re: Fread problem Keith Thompson <kst-u@mib.org> - 2011-07-18 08:53 -0700
Re: Fread problem Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-07-18 18:07 +0100
Re: Fread problem Keith Thompson <kst-u@mib.org> - 2011-07-18 12:50 -0700
Re: Fread problem Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-07-18 12:18 -0600
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-18 20:18 +0000
Re: Fread problem Keith Thompson <kst-u@mib.org> - 2011-07-18 13:28 -0700
Re: Fread problem Lew Pitcher <lpitcher@teksavvy.com> - 2011-07-18 16:55 -0400
Re: Fread problem Anders Wegge Keller <wegge@wegge.dk> - 2011-07-18 22:51 +0200
Re: Fread problem blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-07-19 17:21 +0000
Re: Fread problem Kenneth Brody <kenbrody@spamcop.net> - 2011-07-18 13:44 -0400
Re: Fread problem Ian Collins <ian-news@hotmail.com> - 2011-07-16 21:39 +1200
Re: Fread problem Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-07-16 12:18 -0600
Re: Fread problem John Gordon <gordon@panix.com> - 2011-07-16 19:36 +0000
csiph-web