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authorDavid Herrmann <dh.herrmann@gmail.com>2013-11-27 10:36:35 +0100
committerDavid Herrmann <dh.herrmann@gmail.com>2013-11-28 15:16:49 +0100
commit2a16a986ce5f1bdb7e96abfe14fcb9f34c9364b6 (patch)
tree0bf819aa4399d09659ac971bde7312b3f6b0d198 /src/libsystemd-bus/sd-event.c
parent90a18413f8be577a649900eca977e060273f2b5b (diff)
event: allow EPOLLET as event flag
EPOLLET enables edge-triggered mode (see epoll(7) for more). For most use-cases, level-triggered is just fine, but for master-TTYs we need edge-triggered to catch EPOLLHUP. master-TTYs signal EPOLLHUP if no client is connected, but a client may connect some time later (same happens during vhangup(2)). However, epoll doesn't allow masking EPOLLHUP so it's signaled constantly. To avoid this, edge-triggered mode is needed.
Diffstat (limited to 'src/libsystemd-bus/sd-event.c')
-rw-r--r--src/libsystemd-bus/sd-event.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libsystemd-bus/sd-event.c b/src/libsystemd-bus/sd-event.c
index 6a6581bec6..b5ddf71ebe 100644
--- a/src/libsystemd-bus/sd-event.c
+++ b/src/libsystemd-bus/sd-event.c
@@ -584,7 +584,7 @@ _public_ int sd_event_add_io(
assert_return(e, -EINVAL);
assert_return(fd >= 0, -EINVAL);
- assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL);
+ assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL);
assert_return(callback, -EINVAL);
assert_return(ret, -EINVAL);
assert_return(e->state != SD_EVENT_FINISHED, -ESTALE);
@@ -1022,7 +1022,7 @@ _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events)
assert_return(s, -EINVAL);
assert_return(s->type == SOURCE_IO, -EDOM);
- assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL);
+ assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL);
assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE);
assert_return(!event_pid_changed(s->event), -ECHILD);