journal: add public API call sd_journal_get_events()

This function should be used when filling in "struct pollfd"'s .events
field for watching the journal. It will always return POLLIN for now,
but we should keep our options open to change this later on.

This mimics libsystemd-bus' sd_bus_get_events() call with the same
purpose.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index bb99671934..3eba4cd0d1 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1981,6 +1981,19 @@ _public_ int sd_journal_get_fd(sd_journal *j) {
         return j->inotify_fd;
 }
 
+_public_ int sd_journal_get_events(sd_journal *j) {
+        int fd;
+
+        if (!j)
+                return -EINVAL;
+
+        fd = sd_journal_get_fd(j);
+        if (fd < 0)
+                return fd;
+
+        return POLLIN;
+}
+
 static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
         Directory *d;
         int r;