[alsa-devel] snd_pcm_mmap_writei

Irfan Shaikh irfan.shaikh at sasken.com
Thu Nov 18 08:22:32 CET 2010

All adresses are also VALID
data : 0x96000 alsaparams->data :0x96000 count :4032 alsaParams->pcm_handle : 0xcfbe0

Please go through belo problem

From: alsa-devel-bounces at alsa-project.org [alsa-devel-bounces at alsa-project.org] On Behalf Of Irfan Shaikh [irfan.shaikh at sasken.com]
Sent: Thursday, November 18, 2010 12:44 PM
To: alsa-devel at alsa-project.org
Subject: [alsa-devel] snd_pcm_mmap_writei

Hello All,

Replacing  snd_pcm_writei with snd_pcm__mmap_writei gives SEGFAULT in My code.
Works fine with pcm.c. Can ANyone help me on FINDING OUT WHAT MAY BE CAUSE OF SEGFAULT ?
Is any thing specific required for MMAP Write ????

/$$$ Works FINE $$$/
//while ((pcmreturn = snd_pcm_writei(alsaParams->pcm_handle, data, count)) < 0)   // ===>>>>Replaced by below LINE

/$$$ SEG FAULT$$$/
while ((pcmreturn = snd_pcm__mmap_writei(alsaParams->pcm_handle, data, count)) < 0)    // REPLACED ABOVE NORMAL WRTIE WITH MMAP WRITE
                  * My code

Thanks in advance,
Best Regards

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