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-rw-r--r--src/libsystemd/sd-bus/bus-kernel.c7
-rw-r--r--src/libsystemd/sd-bus/kdbus.h16
-rw-r--r--src/libsystemd/sd-bus/test-bus-kernel.c2
3 files changed, 15 insertions, 10 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index e90ee449d9..df772036ee 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -1345,15 +1345,12 @@ int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
}
r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
+ if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
+ log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
if (r < 0) {
if (errno == EAGAIN)
return 0;
- if (errno == EOVERFLOW) {
- log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
- return 0;
- }
-
return -errno;
}
diff --git a/src/libsystemd/sd-bus/kdbus.h b/src/libsystemd/sd-bus/kdbus.h
index 1cc475eb1d..f7fbfd9929 100644
--- a/src/libsystemd/sd-bus/kdbus.h
+++ b/src/libsystemd/sd-bus/kdbus.h
@@ -602,9 +602,15 @@ enum kdbus_recv_flags {
* @KDBUS_RECV_RETURN_INCOMPLETE_FDS: One or more file descriptors could not
* be installed. These descriptors in
* KDBUS_ITEM_FDS will carry the value -1.
+ * @KDBUS_RECV_RETURN_DROPPED_MSGS: There have been dropped messages since
+ * the last time a message was received.
+ * The 'dropped_msgs' counter contains the
+ * number of messages dropped pool
+ * overflows or other missed broadcasts.
*/
enum kdbus_recv_return_flags {
KDBUS_RECV_RETURN_INCOMPLETE_FDS = 1ULL << 0,
+ KDBUS_RECV_RETURN_DROPPED_MSGS = 1ULL << 1,
};
/**
@@ -614,10 +620,12 @@ enum kdbus_recv_return_flags {
* @return_flags: Command return flags, kernel → userspace
* @priority: Minimum priority of the messages to de-queue. Lowest
* values have the highest priority.
- * @dropped_msgs: In case the KDBUS_CMD_RECV ioctl returns
- * -EOVERFLOW, this field will contain the number of
- * broadcast messages that have been lost since the
- * last call.
+ * @dropped_msgs: In case there were any dropped messages since the last
+ * time a message was received, this will be set to the
+ * number of lost messages and
+ * KDBUS_RECV_RETURN_DROPPED_MSGS will be set in
+ * 'return_flags'. This can only happen if the ioctl
+ * returns 0 or EAGAIN.
* @msg: Return storage for received message.
* @items: Additional items for this command.
*
diff --git a/src/libsystemd/sd-bus/test-bus-kernel.c b/src/libsystemd/sd-bus/test-bus-kernel.c
index 3aec568229..c396eac2d2 100644
--- a/src/libsystemd/sd-bus/test-bus-kernel.c
+++ b/src/libsystemd/sd-bus/test-bus-kernel.c
@@ -119,7 +119,7 @@ int main(int argc, char *argv[]) {
assert_se(r == -EBUSY);
r = sd_bus_process_priority(b, -10, &m);
- assert_se(r == -ENOMSG);
+ assert_se(r == 0);
r = sd_bus_process(b, &m);
assert_se(r > 0);