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Message-ID: | <4166513D.92D782BF@yahoo.com> |
From: | CBFalconer <cbfalconer AT yahoo DOT com> |
Organization: | Ched Research |
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Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Free() crash my program! |
References: | <D7Kdnfji89etsfvcRVn-qA AT comcast DOT com> <41663c2c$0$179$cc7c7865 AT news DOT luth DOT se> |
Lines: | 40 |
Date: | Fri, 08 Oct 2004 08:57:58 GMT |
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X-Trace: | bgtnsc05-news.ops.worldnet.att.net 1097225878 12.76.132.39 (Fri, 08 Oct 2004 08:57:58 GMT) |
NNTP-Posting-Date: | Fri, 08 Oct 2004 08:57:58 GMT |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Martin Str|mberg wrote: > 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. Shouldn't there be some limit on the len parameter? Just considering the nature of the DOS memory addressing, I would expect it to not work for anything over 65535. But that cast certainly has to go. -- Chuck F (cbfalconer AT yahoo DOT com) (cbfalconer AT worldnet DOT att DOT net) Available for consulting/temporary embedded and systems. <http://cbfalconer.home.att.net> USE worldnet address!
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