1 files changed, 27 insertions, 0 deletions
diff --git a/man/journal-iterate-poll.c b/man/journal-iterate-poll.c
new file mode 100644
index 0000000..d377324
--- /dev/null
+++ b/man/journal-iterate-poll.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: MIT-0 */
+
+#include <poll.h>
+#include <time.h>
+#include <systemd/sd-journal.h>
+
+int wait_for_changes(sd_journal *j) {
+  uint64_t t;
+  int msec;
+  struct pollfd pollfd;
+
+  sd_journal_get_timeout(j, &t);
+  if (t == (uint64_t) -1)
+    msec = -1;
+  else {
+    struct timespec ts;
+    uint64_t n;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
+    msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
+  }
+
+  pollfd.fd = sd_journal_get_fd(j);
+  pollfd.events = sd_journal_get_events(j);
+  poll(&pollfd, 1, msec);
+  return sd_journal_process(j);
+}