From: Matt Wette <matt.wette@gmail.com>
To: Jeff Mickey <j@codemac.net>
Cc: guile-user@gnu.org
Subject: Re: dynamic-link on libc
Date: Fri, 4 Aug 2017 14:44:49 -0700 [thread overview]
Message-ID: <CE55351B-68FD-4D24-8505-DAD9D2911B50@gmail.com> (raw)
In-Reply-To: <q88zh8xn2fwd.fsf@codemac.net>
> On Aug 4, 2017, at 2:15 PM, Jeff Mickey <j@codemac.net> wrote:
>
> Hi guilers!
>
> I cannot seem to call `dynamic-link' on libc.
>
> I'm trying to write a simple, dumb wrapper around syslog using the (system foreign) dynamic library to learn how to use the dynamic ffi.
>
> (use-modules (system foreign))
> (define libcsyslog (dynamic-link "libc")) (define syslog (let ((f (pointer->procedure void (dynamic-func "syslog" libcsyslog) (list int '*)))) (lambda (level msg) (let* ((clevel level) (cmsg (string->pointer msg))) (f clevel cmsg))))) (syslog 3 "hello there")
>
> This works when I symlink /lib/x86_64-linux-gnu/libc.so.6 to libc.so, but it looks like the libtool library that is doing the load doesn't accept names that end in ".6" as a library name, and when I used the full path it just says "file not found".
>
> Anyone have suggestions? I looked at the dynl.c sysdep_dynl_link function, but I'm not sure I understand libtool well enough to know what lt_dlopenext should be doing.
>
> I should add I tested this on a debian system with a debian provided guile, and a "user installed guix" guile install as well.
>
> Thanks!
>
> // codemac
>
I don’t think you need to dynamic-link libc; just use (dynamic-func "syslog" (dynamic-link)).
next prev parent reply other threads:[~2017-08-04 21:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-04 21:15 dynamic-link on libc Jeff Mickey
2017-08-04 21:44 ` Matt Wette [this message]
2017-08-04 22:12 ` Jeff Mickey
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