[systemd-devel] [PATCH 1/2] Remove the cap on epoll events

[Hannes Reinecke]

Currently the code will silently blank out events
if there are more then 512 epoll events, causing them
never to be handled at all.
This patch removes the cap on the number of events
for epoll_wait, thereby avoiding this issue.

Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 src/libsystemd/sd-event/sd-event.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 0c4e517..dae81c5 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -36,7 +36,6 @@
 
 #include "sd-event.h"
 
-#define EPOLL_QUEUE_MAX 512U
 #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC)
 
 typedef enum EventSourceType {
@@ -2366,7 +2365,7 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
                 return 1;
         }
 
-        ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX);
+        ev_queue_max = e->n_sources > 0 ? e->n_source : 1;
         ev_queue = newa(struct epoll_event, ev_queue_max);
 
         m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max,
-- 
1.8.4.5