This function reads data from a stream connected to a sound server.
It exists to have a portable way to read data from the sound server
that does not depend on the underlying operating system.
PARAMETERS
fh
The stream file handle connected to the server.
This must be opend using muroar_stream(3).
buf
A pointer to the block of data that should be read.
len
The total length in byte of the data that should be read.
RETURN VALUE
On success this call return the number of bytes successful read.
On error, -1 is returned.
NOTES
This function calls the underlying read function in a loop.
If this returns less than the given length you should not re-try
directly but wait at least some milisecunds.
HISTORY
This function first appeared in muRoar version 0.1beta0.