On Tue, Jun 30, 2009 at 08:33:15AM +0200, Takashi Iwai wrote:
It looks like we're talking about different things. You seem to be talking about external PCM plugins, i'm talking about external functions for the "hook" PCM plugin. The code i question is in pcm/pcm_hooks.c in function snd_pcm_hook_add_conf:
if (err >= 0) { if (args && snd_config_get_string(args, &str) >= 0) { err = snd_config_search_definition(root, "hook_args", str, &args); if (err < 0) SNDERR("unknown hook_args %s", str); else err = install_func(pcm, args); snd_config_delete(args); } else err = install_func(pcm, args); snd_dlclose(h); }Ah, I understand now. Yes, this looks like a bug. Meanwhile, it makes another bug if we just remove it. There would be no dlclose(), then. It'd need resource tracking.
Exactly the reason i haven't tried to make a proper patch ;)
A lack of dlclose is no serious bug, though.
I hope you know better than me ;)
So... just removing snd_dlclose() there fixes your problem? If yes, I'll commit the fix.
TBH, i've not tried but i'm pretty sure it will fix the problem. I tried with dlopen workaround (to increase the refcounter) in install function and i tried with LD_PRELOAD'ing the library before starting an alsa app; both workarounds worked.