Date: Mon, 18 Aug 1997 16:50:44 -0600 (MDT) From: Nate Williams <nate@mt.sri.com> To: Nate Williams <nate@mt.sri.com> Cc: "Jordan K. Hubbard" <jkh@freebsd.org>, hackers@freebsd.org Subject: Re: [Fwd: Re: Please Help Me Understand dlopen()] Message-ID: <199708182250.QAA03442@rocky.mt.sri.com> In-Reply-To: <199708182158.PAA03256@rocky.mt.sri.com> References: <33F869F3.446B9B3D@FreeBSD.org> <199708182158.PAA03256@rocky.mt.sri.com>
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> >
> > The freeBSD dlsym() is - as far as I know - the only dlsym()
> > implementation that doesn't search for _funktion() ...
>
> Here's a quick and dirty patch that implements it. I tested it locally
> w/out any problems, but it has lots of possible problems.
>
> 1) If fails to prepend another underscore if the symbol already is
> underscored.
> 2) I haven't tested it enough on the entire system.
> 3) It might not be the correct solution.
>
I didn't even send out the original patch, but in any case here's the
next version of it, which avoids problem 1 above. Again, it's been
lightly tested, but seems to work. The patch is against 2.2-stable.
Nate
----------
===================================================================
RCS file: /home/CVS/src/gnu/usr.bin/ld/rtld/rtld.c,v
retrieving revision 1.40.2.3
diff -c -r1.40.2.3 rtld.c
*** rtld.c 1997/08/08 02:18:14 1.40.2.3
--- rtld.c 1997/08/18 22:48:58
***************
*** 1916,1922 ****
}
static void *
! __dlsym3(fd, sym, retaddr)
void *fd;
char *sym;
void *retaddr;
--- 1916,1922 ----
}
static void *
! __resolvesym_(fd, sym, retaddr)
void *fd;
char *sym;
void *retaddr;
***************
*** 1973,1978 ****
--- 1973,2002 ----
addr += (long)src_map->som_addr;
return (void *)addr;
+ }
+
+ static void *
+ __dlsym3(fd, sym, retaddr)
+ void *fd;
+ char *sym;
+ void *retaddr;
+ {
+ void *result;
+
+ result = __resolvesym_(fd, sym, retaddr);
+ /*
+ * XXX - Ugly, but it makes the least impact on the run-time loader
+ * sources.
+ */
+ if (result == NULL && !strcmp(dlerror_msg, "Undefined symbol")) {
+ /* Prepend an underscore and try again */
+ char *newsym = malloc(strlen(sym) + 1);
+
+ newsym[0] = '_';
+ strcpy(&newsym[1], sym);
+ result = __resolvesym_(fd, newsym, retaddr);
+ }
+ return result;
}
static char *
Index: rtld.c
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