Date: Mon, 16 Nov 1998 22:17:47 -0700 From: Nate Williams <nate@mt.sri.com> To: hackers@FreeBSD.ORG Subject: Wrapping a function Message-ID: <199811170517.WAA22627@mt.sri.com>
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Does anyone have an easy way of 'wrapping' an already existing library
function so that any programs linked against your .o will call your
function, but so your function can call the 'real' library function?
Example:
my_malloc.c:
void *malloc(size_t size)
{
void *ret;
printf("Calling malloc\n");
ret = REALMALLOC(size);
printf("Leaving malloc\n");
return ret;
}
Ignoring all of the functions where there is loss of errno and such, are
they any good ideas? Note, the use of the dl* functions is explicitly
not allowed since those happen to be the functions I want to wrap in
this case.
I'm at a loss here how to do this in C, so any good hacks are welcomed.
Nate
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