diff options
Diffstat (limited to 'man2')
| -rw-r--r-- | man2/signalfd.2 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/man2/signalfd.2 b/man2/signalfd.2 index 497ee4cbde..a96ff6441c 100644 --- a/man2/signalfd.2 +++ b/man2/signalfd.2 @@ -261,6 +261,23 @@ itself and the signals that are directed to the process (i.e., the entire thread group). (A thread will not be able to read signals that are directed to other threads in the process.) +.SS epoll(7) semantics +If you add a signalfd file descriptor to +.BR epoll(7) +then +.BR epoll_wait(2) +will only return events for signals received by the process that did +the +.BR epoll_ctl(2). +If you then +.BR fork(2), +say by calling +.BR daemon(3), +then you will find that you don't get any notifications for sent +signals. For this to work, you need to add the signalfd file +descriptor to +.BR epoll(7) +after forking. .SH RETURN VALUE On success, .BR signalfd () |