journald: port to sd-event and enable watchdog support

1 files changed, 29 insertions, 9 deletions

diff --git a/src/journal/journald-kmsg.c b/src/journal/journald-kmsg.c
index af49d8578a..bc42548cd1 100644
--- a/src/journal/journald-kmsg.c
+++ b/src/journal/journald-kmsg.c
@@ -320,7 +320,7 @@ finish:
         free(pid);
 }
 
-int server_read_dev_kmsg(Server *s) {
+static int server_read_dev_kmsg(Server *s) {
         char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */
         ssize_t l;
 
@@ -335,7 +335,7 @@ int server_read_dev_kmsg(Server *s) {
                  * return EINVAL when we try. So handle this cleanly,
                  * but don' try to ever read from it again. */
                 if (errno == EINVAL) {
-                        epoll_ctl(s->epoll_fd, EPOLL_CTL_DEL, s->dev_kmsg_fd, NULL);
+                        s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source);
                         return 0;
                 }
 
@@ -375,8 +375,24 @@ int server_flush_dev_kmsg(Server *s) {
         return 0;
 }
 
+static int dispatch_dev_kmsg(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
+        Server *s = userdata;
+
+        assert(es);
+        assert(fd == s->dev_kmsg_fd);
+        assert(s);
+
+        if (revents & EPOLLERR)
+                log_warning("/dev/kmsg buffer overrun, some messages lost.");
+
+        if (!(revents & EPOLLIN))
+                log_error("Got invalid event from epoll for /dev/kmsg: %"PRIx32, revents);
+
+        return server_read_dev_kmsg(s);
+}
+
 int server_open_dev_kmsg(Server *s) {
-        struct epoll_event ev;
+        int r;
 
         assert(s);
 
@@ -386,17 +402,21 @@ int server_open_dev_kmsg(Server *s) {
                 return 0;
         }
 
-        zero(ev);
-        ev.events = EPOLLIN;
-        ev.data.fd = s->dev_kmsg_fd;
-        if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->dev_kmsg_fd, &ev) < 0) {
+        r = sd_event_add_io(s->event, s->dev_kmsg_fd, EPOLLIN, dispatch_dev_kmsg, s, &s->dev_kmsg_event_source);
+        if (r < 0) {
 
                 /* This will fail with EPERM on older kernels where
                  * /dev/kmsg is not readable. */
-                if (errno == EPERM)
+                if (r == -EPERM)
                         return 0;
 
-                log_error("Failed to add /dev/kmsg fd to epoll object: %m");
+                log_error("Failed to add /dev/kmsg fd to event loop: %s", strerror(-r));
+                return -errno;
+        }
+
+        r = sd_event_source_set_priority(s->dev_kmsg_event_source, SD_EVENT_PRIORITY_IMPORTANT+10);
+        if (r < 0) {
+                log_error("Failed to adjust priority of kmsg event source: %s", strerror(-r));
                 return -errno;
         }