fifo_write - write data to a fifo
#include <magenta/syscalls.h>
mx_status_t mx_fifo_write(mx_handle_t handle,
const void* buffer, size_t size,
uint32_t* num_entries_written) {
fifo_write() attempts to write some number of elements into the fifo specified by handle. size will be rounded down to a multiple of the fifo's element-size.
It is not legal to write zero elements.
Fewer elements may be written than requested if there is insufficient room in the fifo to contain all of them.
fifo_write() returns MX_OK on success, and returns the number of elements written (at least one) via num_entries_written.
MX_ERR_BAD_HANDLE handle is not a valid handle.
MX_ERR_WRONG_TYPE handle is not a fifo handle.
MX_ERR_INVALID_ARGS buffer is an invalid pointer or num_entries_written is an invalid pointer.
MX_ERR_OUT_OF_RANGE size was smaller than the size of a single element.
MX_ERR_ACCESS_DENIED handle does not have MX_RIGHT_WRITE.
MX_ERR_PEER_CLOSED The other side of the fifo is closed.
MX_ERR_SHOULD_WAIT The fifo is full.