Date: Wed, 03 Dec 2003 02:23:18 -0800 From: Lev Walkin <vlm@netli.com> To: Sergey Lyubka <devnull@uptsoft.com> Cc: freebsd-hackers@freebsd.org Subject: Re: dlopen() and -pg flag Message-ID: <3FCDB996.4090603@netli.com> In-Reply-To: <20031203121658.A822@oasis.uptsoft.com> References: <20031203121658.A822@oasis.uptsoft.com>
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-pg on your system implies static linking. dlopen() is not available in
statically linked binaries on FreeBSD and many other systems.
Consider building your binary dynamic by making sure there is a dynamic
version of libc with profiling support (something like /usr/lib/libc_p.so).
Otherwise, there seems to be no obvious way to do it.
Sergey Lyubka wrote:
> Below is a little snipper that tries to dlopen(argv[1]).
> It works fine until it is compiled with profiling support, -pg flag.
>
> Compiled with -pg, dlopen() reports "Service unavailable".
>
> How to fix that ?
>
> -sergey
>
>
>
> #include <dlfcn.h>
> #include <stdlib.h>
> #include <stdio.h>
>
> int main(int argc, char *argv[])
> {
> void *handle, *sym;
>
> if (argc > 1) {
> handle = dlopen(argv[1], RTLD_NOW);
> if (handle == NULL) {
> fprintf(stderr, "dlopen: %s\n", dlerror());
> } else {
> fprintf(stderr, "handle: %p\n", handle);
> if (argc > 2) {
> sym = dlsym(handle, argv[2]);
> fprintf(stderr, "%s: %p\n", argv[2], sym);
> }
> }
> }
>
> return (EXIT_SUCCESS);
> }
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--
Lev Walkin
vlm@netli.com
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