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.

4 files changed, 19 insertions, 1 deletions

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 1f26787cf7..86895b8f5b 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -27,7 +27,6 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
-#include <sys/poll.h>
 #include <time.h>
 #include <getopt.h>
 #include <signal.h>
diff --git a/src/journal/libsystemd-journal.sym b/src/journal/libsystemd-journal.sym
index fbe41501f0..e241318cb0 100644
--- a/src/journal/libsystemd-journal.sym
+++ b/src/journal/libsystemd-journal.sym
@@ -93,3 +93,8 @@ LIBSYSTEMD_JOURNAL_198 {
 global:
         sd_journal_reliable_fd;
 } LIBSYSTEMD_JOURNAL_196;
+
+LIBSYSTEMD_JOURNAL_201 {
+global:
+        sd_journal_get_events;
+} LIBSYSTEMD_JOURNAL_198;
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;
diff --git a/src/systemd/sd-journal.h b/src/systemd/sd-journal.h
index 2e8d2d882f..aa7693af70 100644
--- a/src/systemd/sd-journal.h
+++ b/src/systemd/sd-journal.h
@@ -127,6 +127,7 @@ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l);
 void sd_journal_restart_unique(sd_journal *j);
 
 int sd_journal_get_fd(sd_journal *j);
+int sd_journal_get_events(sd_journal *j);
 int sd_journal_reliable_fd(sd_journal *j);
 int sd_journal_process(sd_journal *j);
 int sd_journal_wait(sd_journal *j, uint64_t timeout_usec);