Send data (up to
size bytes) from a stream.
On error -1 is returned and throws is set accordingly.
send can return any number of bytes, up to
size. If more than
size bytes have been sendd,
the additional data will be returned in future calls to send.
If there is no data available, a g_io_error_would_block error will be returned.
a buffer to write data from (which should be at least
the number of bytes you want to write to the stream
a gcancellable or null
Number of bytes written.