Open Sound System
OSS 4.x Programmer's Guide

Do you have problems with sound/audio application development? Don't panic! Click here for help!


Discards all samples in the playback buffer



The above code fragment lacks all error checks for clarity. Real world applications must always check for the errors and handle them as described below. Also most OSS ioctl calls will return information in the argument variable and it's usually necessary to check it too.


This ioctl call discards all unplayed samples in the playback buffer by moving the current write position immediately before the point where the device is currently reading the samples. This feature can be used to emulate resume function after playback pause. To enter the paused state the application should call SNDCTL_DSP_SILENCE.

Compatibility issues

This call is supported only by OSS 4.0 compatible drivers.

Please look at the When OSS audio ioctl calls can be made section for information about DSP ioctl call ordering.

OSS ioctl return values

The return value from the OSS ioctl calls will be -1 if a fatal error occurred. Other values mean that the ioctl call was more or less successful. However in most cases the application must check the value returned in the argument to see what was the accepted value.

Please see the Possible error codes (errno) returned by OSS calls section for more info about the error codes returned by OSS.

Sample programs

No sample programs available

Copyright (C) 4Front Technologies, 2007. All rights reserved.
Back to index OSS web site