Open Sound System
OSS 4.x Programmer's Guide

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MIXF_POLL mixer control type

Value may change spontaneously


Normally mixer controls change their value only if the modify_counter parameter returned by SNDCTL_MIXERINFO has changed. However some controls may change without notice. If the MIXF_POLL flag is set for a control it's recommended to check the value of the control (say) once per second even if modify_counter has not changed.

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