snd_pcm_readi(),return -11,Resource temporarily unavailable

[xukawendi]

i called the function snd_pcm_readi() to capture pcm data, but the function returns -11,and the snd_strerror(-11) shows "Resource temporarily unavailable",How can I resolve this problem?

[perexg]

Error -11 is EAGAIN. It's standard linux error code for the non-blocking I/O. See man 3 read and look for EAGAIN / O_NONBLOCK comments.