Asynchronously fills a buffer with bytes read from an async-io-state.
async-io-state-read-buffer async-io-state buffer callback &key start end timeout error-callback user-info
An async-io-state.
A cl:base-string
or an 8-bit cl:simple-array
.
A function designator for a function of 3 arguments.
A lower bounding index designator for buffer.
An upper bounding index designator for buffer.
nil
or a positive real.
A function designator for a function of 3 arguments, or nil
.
A Lisp object.
The function async-io-state-read-buffer
asynchronously fills the buffer buffer between start and end with bytes read from async-io-state. When buffer is full (between start and end) or the async-io-state-read-timeout of async-io-state has passed, the callback is called like this:
callback async-io-state buffer number-of-bytes-read
If an error occurs during the I/O operation and error-callback is non-nil, then error-callback is called with these same arguments:
error-callback async-io-state buffer number-of-bytes-read
If error-callback is nil
, then callback is called, so it should check for errors using async-io-state-read-status.
The default value of start is 0. The default value of end is the length of buffer.
If the operation does not finish within the state's async-io-state-read-timeout period then state's async-io-state-read-status is set to :timeout
and callback is called.
If timeout or user-info are supplied then they set async-io-state-read-timeout and async-io-state-user-info in async-io-state for this and subsequent operations.
If another read operation on the state is in progress, an error is signaled.
LispWorks User Guide and Reference Manual - 20 Sep 2017