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| author | Ronnie Sahlberg <ronniesahlberg@gmail.com> | 2012-01-04 21:41:12 +1100 |
|---|---|---|
| committer | Ronnie Sahlberg <ronniesahlberg@gmail.com> | 2012-01-04 21:41:12 +1100 |
| commit | b5b4c1a2eacefcac39e0932bae9397be363945e3 (patch) | |
| tree | 73c3b7742e71049be35b68fade1ba5e11a984408 /ctdb | |
| parent | e6480454990a2736928541b63db4ee8f8e07ef48 (diff) | |
| download | samba-b5b4c1a2eacefcac39e0932bae9397be363945e3.tar.gz samba-b5b4c1a2eacefcac39e0932bae9397be363945e3.tar.xz samba-b5b4c1a2eacefcac39e0932bae9397be363945e3.zip | |
explain why we use FIONREAD
(This used to be ctdb commit d0f85478c37828eb8a24315d4326eb4eaedb9afc)
Diffstat (limited to 'ctdb')
| -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; } |