Open Sound System
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int id=The sync group ID;
ioctl(fd, SNDCTL_DSP_SYNCSTART, &id);
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.
The group identifier needs to be obtained by calling
SNDCTL_DSP_SYNCGROUP. However the device pointed by the file descriptor (
fd) doesn't need to belong to the sync group. Any application that knows the identifier can start the group.
Please look at the When OSS audio ioctl calls can be made section for information about DSP ioctl call ordering.
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.
|synctest.c||A program that demonstrates use of syncronization groups.|