From owner-freebsd-bugs  Mon Nov 18 11:30: 6 2002
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Date: Mon, 18 Nov 2002 11:30:01 -0800 (PST)
Message-Id: <200211181930.gAIJU1BS093143@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
Cc: 
From: "Ulrich 'Q' Spoerlein" <q@uni.de>
Subject: Re: kern/41747: quake won't play sound with newpcm driver
Reply-To: "Ulrich 'Q' Spoerlein" <q@uni.de>
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The following reply was made to PR kern/41747; it has been noted by GNATS.

From: "Ulrich 'Q' Spoerlein" <q@uni.de>
To: freebsd-gnats-submit@FreeBSD.org, q@uni.de,
	Orion Hodson <orion@FreeBSD.org>
Cc:  
Subject: Re: kern/41747: quake won't play sound with newpcm driver
Date: Mon, 18 Nov 2002 20:21:26 +0100

 So,
 
 after several MFCs of the -current pcm-driver, this problem still exists,
 and is not limited to Quake.
 
 Maxim Sobolev posted a thread on -multimedia with a small test program
 triggering the issue on -STABLE (but not on -CURRENT). It looks like the
 pcm driver or the mmap() call need/want read-write access to the device
 (though write-only access should be fine)
 
 this code breaks on -STABLE:
 
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <sys/soundcard.h>
 #include <err.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <strings.h>
 
 int bytesok = 0;
 
 void
 catch(int signum)
 {
         printf("Signal %d catched, only %d bytes cleared\n", signum,
 bytesok);
         exit (1);
 }
 
 int main()
 {
         int fd;
         audio_buf_info info;
         int frags;
         void *p;
         fd = open("/dev/dsp", O_WRONLY | O_DIRECT);
 /*	Changing this to read/write access....
 	fd = open("/dev/dsp", O_RDWR); 
 */
         if (fd == -1)
                 err(1, "can't open audio device");
         frags = 0x0020000B;     /* 64K buffer (32 * 2^11) */
         if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frags) == -1)
                 err(1, "can't set fragments");
         if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
                 err(1, "can't get info about i/o space");
         p = mmap(NULL, info.fragstotal * info.fragsize, PROT_WRITE,
 MAP_SHARED,
             fd, 0);
 /*	...and this to read/write works
 	p = mmap(NULL, info.fragstotal * info.fragsize, PROT_READ|PROT_WRITE,
 MAP_SHARED,
           fd, 0);
 */
         if (p == MAP_FAILED)
                 err(1, "can't mmap() output buffer");
         signal(SIGBUS, catch);
         for (bytesok = 0; bytesok < info.fragstotal * info.fragsize;
 bytesok++)
                 *((char *)p + bytesok) = 0;
         exit (0);
 }

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