From: "Jörg Krause" <joerg.krause@embedded.rocks>
To: alsa-devel@alsa-project.org
Subject: ALSA hooks: dlopen failed: snd_dlsym_start: symbol not found
Date: Fri, 26 Aug 2016 04:11:08 +0200 [thread overview]
Message-ID: <1472177468.19908.28.camel@embedded.rocks> (raw)
Hi,
I am trying to build a custom hook library. The minimal hook is:
#include <alsa/asoundlib.h>
int _snd_pcm_hook_audio_status_install(snd_pcm_t *pcm, snd_config_t
*conf)
{
return 0;
}
SND_DLSYM_BUILD_VERSION(_snd_pcm_hook_audio_status_install,
SND_CONFIG_DLSYM_VERSION_HOOK);
I compile this as a shared library:
$(CC) -fPIC -lasound -shared -Wl,-soname,lib$(NAME).so $^ -o $@
If I try to load this library using aplay I get the following error:
dlopen failed: Error relocating /usr/lib/alsa-lib/libaudiostatus.so:
snd_dlsym_start: symbol not found
This is the output of the preprocessor:
int _snd_pcm_hook_audio_status_install(snd_pcm_t *pcm, snd_config_t
*conf)
{
return 0;
}
static struct snd_dlsym_link
_snd_dlsym__snd_pcm_hook_audio_status_install_dlsym_config_hook_001;
void
_snd_dlsym_constructor__snd_pcm_hook_audio_status_install_dlsym_conf
ig_hook_001 (void) __attribute__ ((constructor));
void
_snd_dlsym_constructor__snd_pcm_hook_audio_status_install_dlsym_conf
ig_hook_001 (void) {
_snd_dlsym__snd_pcm_hook_audio_status_install_dlsym_config_hook
_001.next = snd_dlsym_start;
_snd_dlsym__snd_pcm_hook_audio_status_install_dlsym_config_hook
_001.dlsym_name = "_snd_pcm_hook_audio_status_install";
_snd_dlsym__snd_pcm_hook_audio_status_install_dlsym_config_hook
_001.dlsym_ptr = (void *)&_snd_pcm_hook_audio_status_install;
snd_dlsym_start =
&_snd_dlsym__snd_pcm_hook_audio_status_install_dlsym_config_hook_001
;
};
What do I miss?
Best regards
Jörg Krause
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