Tries to read from stream, as with read (if blocking
is true) or
read_nonblocking (if blocking is false).
This can be used to more easily share code between blocking and non-blocking implementations of a method.
If blocking is false, then stream must be a
PollableInputStream for which
can_poll returns true, or
else the behavior is undefined. If blocking is true, then stream does not need
to be a PollableInputStream.
| stream | |
| buffer |
a buffer to read data into |
| blocking |
whether to do blocking I/O |
| cancellable |
optional Cancellable object, null to ignore. |
| count |
the number of bytes to read |
|
the number of bytes read, or -1 on error. |