Date: Tue, 04 Apr 1995 00:42:37 -0700 From: Steven Wallace <swallace@ece.uci.edu> To: Sujal Patel <smpatel@wam.umd.edu> Cc: hackers@FreeBSD.org Subject: Re: Whee - I've got my MBONE feed.. Message-ID: <199504040742.AA15813@balboa.eng.uci.edu> In-Reply-To: Your message of "Tue, 04 Apr 1995 01:52:34 EDT." <Pine.BSD.3.91.950404014302.136G-100000@xi.dorm.umd.edu>
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> On Mon, 3 Apr 1995, Steven Wallace wrote:
>
>> What software uses SNDCTL_DSP_SETFRAGMENT? What sound card are you using?
>> Have you tried recompiling the software? Have you tried using
>> an old one compiled for 1.1 or 2.0?
>
> The software I'm using is Paradise-netrek. I've tried both 2.0
> compiled and -current compiled binaries.
>
> Here is a code fragment:
>
> *fragsize = 0;
> frag = 0x00080007;
>
> ioctl(dsp, SNDCTL_DSP_SETFRAGMENT, &frag);
> ioctl(dsp, SNDCTL_DSP_GETBLKSIZE, fragsize);
>
> if (!(*fragsize)) {
> printf ("Error: Couldn't Get Block Size\n");
> }
>
>
> On Linux (same VoxWare drivers), this code fragment runs through ok. On
> FreeBSD, the GETBLKSIZE returns 0 causing the Error.
>
Take a look:
*** /usr/src-2.0/sys/i386/include/soundcard.h Mon Nov 14 06:13:13 1994
--- /sys/i386/include/soundcard.h Wed Mar 8 13:19:01 1995
--- 63,68 ----
***************
*** 536,548 ****
#define SNDCTL_DSP_SYNC _IO ('P', 1)
#define SNDCTL_DSP_SPEED _IOWR('P', 2, int)
#define SNDCTL_DSP_STEREO _IOWR('P', 3, int)
! #define SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
#define SNDCTL_DSP_SAMPLESIZE SNDCTL_DSP_SETFMT
#define SOUND_PCM_WRITE_CHANNELS _IOWR('P', 6, int)
#define SOUND_PCM_WRITE_FILTER _IOWR('P', 7, int)
#define SNDCTL_DSP_POST _IO ('P', 8)
#define SNDCTL_DSP_SUBDIVIDE _IOWR('P', 9, int)
#define SNDCTL_DSP_SETFRAGMENT _IOWR('P',10, int)
/* Audio data formats (Note! U8=8 and S16_LE=16 for compatibility) */
#define SNDCTL_DSP_GETFMTS _IOR ('P',11, int) /* Returns a mask */
--- 514,527 ----
#define SNDCTL_DSP_SYNC _IO ('P', 1)
#define SNDCTL_DSP_SPEED _IOWR('P', 2, int)
#define SNDCTL_DSP_STEREO _IOWR('P', 3, int)
! #define SNDCTL_DSP_GETBLKSIZE _IOR('P', 4, int)
#define SNDCTL_DSP_SAMPLESIZE SNDCTL_DSP_SETFMT
#define SOUND_PCM_WRITE_CHANNELS _IOWR('P', 6, int)
#define SOUND_PCM_WRITE_FILTER _IOWR('P', 7, int)
#define SNDCTL_DSP_POST _IO ('P', 8)
#define SNDCTL_DSP_SUBDIVIDE _IOWR('P', 9, int)
#define SNDCTL_DSP_SETFRAGMENT _IOWR('P',10, int)
+ #define SNDCTL_DSP_SETBLKSIZE _IOW('P', 4, int)
/* Audio data formats (Note! U8=8 and S16_LE=16 for compatibility) */
#define SNDCTL_DSP_GETFMTS _IOR ('P',11, int) /* Returns a mask */
As you can see, SNDCTL_DSP_GETBLKSIZE has been changed from _IOWR to
_IOR, so old binaries compiled with _IOWR will not be able to find
the ioctl, causing the error to be displayed. You can change it
back and then recompile your kernel and the old binaries should work.
So it is SNDCTL_DSP_GETBLKSIZE that is causing you probs, not
SNDCTL_DSP_SETFRAGMENT. If you compile using a -current kernel
but still have old <machine/soundcard.h> to compile the program,
they won't match and it will still not work.
Perhaps in the kernel sound code, we should have SNDCTL_DSP_GETBLKSIZE
accept both _IOWR and _IOR types for backwards broken compatability.
What do you guys think?
Steven
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