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Diffstat (limited to 'src/libsystemd/sd-bus/bus-kernel.c')
-rw-r--r--src/libsystemd/sd-bus/bus-kernel.c75
1 files changed, 54 insertions, 21 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index f85b4d5676..99ac5b1ed3 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -206,6 +206,8 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
assert(m);
assert(m->sealed);
+ /* We put this together only once, if this message is reused
+ * we reuse the earlier-built version */
if (m->kdbus)
return 0;
@@ -722,7 +724,26 @@ int bus_kernel_connect(sd_bus *b) {
return bus_kernel_take_fd(b);
}
-int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
+static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
+ uint64_t off;
+ struct kdbus_item *d;
+
+ assert(bus);
+ assert(k);
+
+ off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
+ ioctl(bus->input_fd, KDBUS_CMD_FREE, &off);
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
+
+ if (d->type == KDBUS_ITEM_FDS)
+ close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
+ close_nointr_nofail(d->memfd.fd);
+ }
+}
+
+int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
int r;
assert(bus);
@@ -738,6 +759,14 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
if (r < 0)
return r;
+ /* If this is a synchronous method call, then let's tell the
+ * kernel, so that it can pass CPU time/scheduling to the
+ * destination for the time, if it wants to. If we
+ * synchronously wait for the result anyway, we won't need CPU
+ * anyway. */
+ if (hint_sync_call)
+ m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY;
+
r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
if (r < 0) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
@@ -785,29 +814,31 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
bus->rqueue[bus->rqueue_size++] = reply;
- return 0;
- }
+ } else if (hint_sync_call) {
+ struct kdbus_msg *k;
- return 1;
-}
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply);
+ assert(k);
-static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
- uint64_t off;
- struct kdbus_item *d;
-
- assert(bus);
- assert(k);
+ if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
- off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
- ioctl(bus->input_fd, KDBUS_CMD_FREE, &off);
-
- KDBUS_ITEM_FOREACH(d, k, items) {
+ r = bus_kernel_make_message(bus, k);
+ if (r < 0) {
+ close_kdbus_msg(bus, k);
- if (d->type == KDBUS_ITEM_FDS)
- close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
- else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
- close_nointr_nofail(d->memfd.fd);
+ /* Anybody can send us invalid messages, let's just drop them. */
+ if (r == -EBADMSG || r == -EPROTOTYPE)
+ log_debug("Ignoring invalid message: %s", strerror(-r));
+ else
+ return r;
+ }
+ } else {
+ log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
+ close_kdbus_msg(bus, k);
+ }
}
+
+ return 1;
}
static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
@@ -964,8 +995,8 @@ int bus_kernel_read_message(sd_bus *bus) {
return -errno;
}
- k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset);
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset);
if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
r = bus_kernel_make_message(bus, k);
@@ -977,8 +1008,10 @@ int bus_kernel_read_message(sd_bus *bus) {
} else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
r = bus_kernel_translate_message(bus, k);
- else
+ else {
+ log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
r = 0;
+ }
if (r <= 0)
close_kdbus_msg(bus, k);