Open Sound System
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int binding=The desired output routing;
ioctl(fd, SNDCTL_DSP_BIND_CHANNEL, &binding);
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.
Note that this call is not officially part of the OSS API. It has been used by few freeware OSS implementations but it's not implemented in official OSS. Use the replacement calls instead.
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.