From mboxrd@z Thu Jan  1 00:00:00 1970
From: nagual.hsu <nagual.hsu@gmail.com>
Subject: Re: libaoss.so hole?
Date: Mon, 20 Mar 2006 02:18:33 +0000 (UTC)
Message-ID: <loom.20060320T031107-48@post.gmane.org>
References: <7fe205990603170512j58c63e4es@mail.gmail.com> <s5h4q1xt3oe.wl%tiwai@suse.de>
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Takashi Iwai <tiwai <at> suse.de> writes:

> 
> >     After I turn on the ALSA_OSS_DEBUG environment variable,
> > libaoss.so first tried to open /dev/dsp0 but in vain. Then it tried a
> > alsa-default device successfully. I can see that every time libaoss.so
> > tries to opena pcm device with a new thread. And thta's the source of
> > the un-expected SIGCHLD signal.
> 
> No, aoss has no single code calling any thread functions...
> 
> Takashi
> 

    Maybe, it's the dmix and it is turned on as default since version
 1.0.10. I tried this with version 1.0.10.

    Check the following code run on computers with intel8x0 chips 
pre-loading libaoss.so:

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <signal.h>

void handler(int signum)
{
	fprintf(stderr, "signal...%d == SIGCHLD??\n", signum);
	return;
}

int main(int argc, char *argv[])
{
	int fd;
	signal(SIGCHLD, handler);
	signal(SIGTERM, handler);
	
	fd = open("/dev/dsp", O_WRONLY);
	fprintf(stderr, "success...\n");
	close(fd);
	return 0;
}






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