Hi!
There is a bug in dlopen(3). The NOTES section claims:
"The symbols RTLD_DEFAULT and RTLD_NEXT are defined by <dlfcn.h> only
when _GNU_SOURCE was defined before including it."
However, this is not correct.
>From dlfcn.h on a "Gentoo Base System release 2.1":
#ifdef __USE_GNU
...
# define RTLD_NEXT ((void *) -1l)
...
# define RTLD_DEFAULT ((void *) 0)
...
You can verify this by compiling the attached program. For me it gives:
test.c: In function `main':
test.c:8: error: `RTLD_NEXT' undeclared (first use in this function)
test.c:8: error: (Each undeclared identifier is reported only once
test.c:8: error: for each function it appears in.)
It works if I set "__USE_GNU_" instead.
Please also check the "Glibc extensions: dladdr() and dlvsym()"
section, it also mentions _GNU_SOURCE.
Thomas
#include <stdio.h>
#include <stdlib.h>
#define _GNU_SOURCE
#include <dlfcn.h>
int main(int argc, char *argv[]) {
printf ("RTLD_NEXT is %d\n", RTLD_NEXT);
exit(0);
}
