diff options
Diffstat (limited to 'ctdb/common/ctdb_io.c')
| -rw-r--r-- | ctdb/common/ctdb_io.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/ctdb/common/ctdb_io.c b/ctdb/common/ctdb_io.c index 86e54e0ac9..810fd41dd1 100644 --- a/ctdb/common/ctdb_io.c +++ b/ctdb/common/ctdb_io.c @@ -78,6 +78,12 @@ static void queue_io_read(struct ctdb_queue *queue) ssize_t nread; uint8_t *data; + /* check how much data is available on the socket for immediately + guaranteed nonblocking access. + as long as we are careful never to try to read more than this + we know all reads will be successful and will neither block + nor fail with a "data not available right now" error + */ if (ioctl(queue->fd, FIONREAD, &num_ready) != 0) { return; } |