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Old 02-20-2010, 02:37 PM   #1
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Registered: Feb 2010
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using ld -wrap function to instrument

Hi All,

I am trying the wrap feature for the first time. I followed the instruction as mentioned in this link

but I am getting an error saying "undefine reference to __wrap_malloc

I followed all the steps, but the post was a decade old, I am sure something has changed? or am I missing something.

Appreciate your time in help me out!
Old 02-22-2010, 07:48 AM   #2
Registered: Dec 2009
Location: Walldorf, Germany
Distribution: (X)Ubuntu, Arch, Gentoo
Posts: 205

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I checked this feature on my system, and it works perfectly. This is what I did:

#include <stdio.h>
#include <stdlib.h>

void *__real_malloc(size_t);

void *__wrap_malloc(size_t c)
        printf("My MALLOC called: %d\n", c);
        return __real_malloc(c);

int main (int argc, char *argv[])
        void *ptr = malloc(12);

        return 0;
And I compiled & run the code with:

[gcc wrap]$ gcc wrap.c -o wrap -Wl,-wrap,malloc
[gcc wrap]$ ./wrap
My MALLOC called: 12
I'm using

* gcc 4.4.3
* binutils

Maybe, you could post your code ...

- Andi -
Old 12-03-2010, 01:04 AM   #3
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Registered: Dec 2010
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May be your code needs extern C


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