Hi,
On Aug 2 2017 03:18, linux newbie wrote:
I am trying to open a handle to dmix device and it fails with (Device or
resource busy) error. On further debugging I found that it fails because
it cannot open the slave HW device. This is the first instance of dmix
but the slave open fails because it is already busy. I am trying to
understand what kind of race condition could cause this situation but I
cannot think of any.
Any thoughts how I could proceed? Maybe retry open is a good solution?
Any advice would be much appreciated.
When alsa-lib applications open the 'hw' PCM node, it executes open(2)
system call to a special file of corresponding ALSA PCM character device
(/dev/snd/pcmC[0-9]+D[0-9]+{c,p}). If it gets -EBUSY (Device or
resources busy), it means that the PCM character device is used by the
other processes.
It's better to investigate such a process in this case. For example, you
can use lsof(8) to the PCM character device. In recent standard Linux
desktop environment, it might be PulseAudio, I guess.
Regards
Takashi Sakamoto
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