Date: Thu, 22 Feb 2001 16:45:42 +0100 From: mouss <usebsd@free.fr> To: diwil@eis.ru, freebsd-hackers@FreeBSD.ORG Subject: Re: warning in free(): Message-ID: <4.3.0.20010222164121.0594c510@pop.free.fr> In-Reply-To: <XFMail.010222161654.diwil@eis.ru> References: <20010222051302.E29126@fw.wintelcom.net>
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Now having free() write to stdout/stderr isn't necessarily a good thing
for daemons. If the message goes through a socket, it'll be hard to
debug, which was the original intent.
I suggest having some way so that when a program becomes a daemon,
it can set some "silent-libc" or "libc messages go to logs" instead of
using stdout/stderr.
Wouldn't it not be cool if err() and warn() had the capability of using syslog
instead of a file or std* when needed. err_set_file allows one to use a file
instead. How about allowing the use of syslog?
At 16:16 22/02/01 +0300, Dmitry Dicky wrote:
>Also, if you do something like:
>
> void *ptr = malloc(size);
>
>...
> ptr++;
>
>free() will complain about it.
>Make sure you are not modifying ptr after it has been malloc()ed.
>
>
>On 22-Feb-01 Alfred Perlstein wrote:
> > * Madhavi Suram <madhavis@sasken.com> [010222 05:09] wrote:
> >>
> >> Hi
> >>
> >> I am running a C program in user space on FreeBSD 3.3 release. I got a
> >> warning like this:
> >>
> >> testing in free(): warning: modified (chunk-) pointer.
> >>
> >> testing is the name of the executable I am running.
> >>
> >> Could anyone tell me what this warning means? What may be the effect
> >> of
> >> this code when I shift it to kernel with due modifications?
> >
> > It means you've most likely corrupted your malloc pool, meaning you've
> > written past/before the edge of an allocation you've done.
> >
> > To fix it start being mor careful with pointers and checking array
> > bounds.
> >
> >
> > --
> > -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
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>
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