Re: dlopen() and libpthread

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Fri, Oct 19, 2012 at 11:16:42AM +0200, Joerg Sonnenberger wrote:
> Because it doesn't work correctly. libc behavior changes etc.
> Explicitly erroring out is a *huge* improvement over silent corruption
> as seen many, many times before.
> 
> You might want to check if the DSO really needs libpthread, in many
> cases it isn't. E.g. if it just wants to use mutexes etc, but doesn't
> create threads itself, the libc stubs are good enough.

It seems to only use pthread_mutex, but when building without -lpthread, 
it does not work anymore: OpenSC clients cannot access  the token anymore
(ssh-agent gets "no slots").

I can workarounf that regression for ssh-agent by doing 
LD_PREOAD=/usr/lib/libpthread.so.1 but this method cannot be used 
for pam modules that are loaded by setuid binaries such as su or login.

-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost