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From:	CBFalconer <cbfalconer AT yahoo DOT com>
Organization:	Ched Research
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Malloc/free DJGPP code
Lines:	43
Date:	Wed, 13 Feb 2002 13:17:57 GMT
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Is there a known incompatibility between printfs and malloc?

[1] c:\c\hashlib>*gcc -W -Wall -O2 -gstabs+ -Dinline= -c malloc.c

[1] c:\c\hashlib>gcc -o hshtestp.exe hashtest.o cokusMT.o
hashlib.o malloc.o

[1] c:\c\hashlib>timerun hshtestp 4 30000
Timer 3 on:  7:57:19
Exiting due to signal SIGSEGV
Stack Fault at eip=00005d18
eax=00000123 ebx=00000123 ecx=00000073 edx=000033bb esi=d8b00000
edi=0000bea0
ebp=00000013 esp=00000003 program=<??UNKNOWN??>
cs: sel=00af  base=83386000  limit=0023ffff
ds: sel=00b7  base=83386000  limit=0023ffff
es: sel=00b7  base=83386000  limit=0023ffff
fs: sel=0087  base=0000b600  limit=0000ffff
gs: sel=00c7  base=00000000  limit=0010ffff
ss: sel=00b7  base=83386000  limit=0023ffff
App stack: [00091910..00011910]  Exceptn stack:
[00011870..0000f930]

Call frame traceback EIPs:
  0x00005d18
Timer 3 off:  7:57:20  Elapsed: 0:00:00.50

Maybe there are initializing calls to malloc before conditions for
printf are setup? This arose when attempting to enable some of the
malloc debug statements, which required adding #include <stdio.h>
to it.  In the above, the main program sign-on has not occurred.

I initially thought it might have to do with the -pg switch, so I
removed that as above, and the crash still occurred.

If this is a "don't do that" situation, how can we get malloc
debug printouts?

-- 
Chuck F (cbfalconer AT yahoo DOT com) (cbfalconer AT XXXXworldnet DOT att DOT net)
   Available for consulting/temporary embedded and systems.
   (Remove "XXXX" from reply address. yahoo works unmodified)
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