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Message-ID: <41663c2c$0$179$cc7c7865@news.luth.se>
From: Martin Str|mberg <ams AT speedy DOT ludd DOT ltu DOT se>
Subject: Re: Free() crash my program!
Newsgroups: comp.os.msdos.djgpp
References: <D7Kdnfji89etsfvcRVn-qA AT comcast DOT com>
User-Agent: tin/1.4.6-20020816 ("Aerials") (UNIX) (NetBSD/1.6Q (alpha))
Date: 08 Oct 2004 07:05:16 GMT
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

JC <jessechao AT comcast DOT net> wrote:
> I used djgpp to develop a simple program, using dosmemget(),
> to dump some DOS memory. The code is like following:

>     p = (UINT8 *)malloc(len+1);
>     if (p == NULL)
>     {
>         ...
>     }
>     dosmemget(addr, len, p);
>     /* Code to printf the contents in *p */
>  ...
>  free(p);

> The code compiled & ran fine. But when the code execute
> the free(). The code crashed and got SIGSEG error:

>     Exiting due to signal SIGSEGV
>     General Protection Fault at eip=00006ac4

> Anyone can help me on this?

1. Remove that UINT8 * cast.

2. If that doesn't help you need to give more information, because
malloc() and free() work fine so it must be something else.


Right,

						MartinS