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0cfb00d9da
The methods published by the example have a reply in the signature, but the code was not sending any, so the client gets stuck waiting for a response that doesn't arrive. Echo back the input string. Update the object path to follow what would be the canonical format. Request a service name on the bus, so that the code can be dropped in a service and it can be dbus-activatable. It also makes it easier to see on busctl list.
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* SPDX-License-Identifier: CC0-1.0 */
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#include <errno.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <systemd/sd-bus.h>
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#define _cleanup_(f) __attribute__((cleanup(f)))
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#define check(x) ({ \
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int r = (x); \
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errno = r < 0 ? -r : 0; \
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printf(#x ": %m\n"); \
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if (r < 0) \
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return EXIT_FAILURE; \
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})
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typedef struct object {
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char *name;
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uint32_t number;
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} object;
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static int method(sd_bus_message *m, void *userdata, sd_bus_error *error) {
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printf("Got called with userdata=%p\n", userdata);
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if (sd_bus_message_is_method_call(m,
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"org.freedesktop.systemd.VtableExample",
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"Method4"))
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return 1;
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const char *string;
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check(sd_bus_message_read(m, "s", &string));
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check(sd_bus_reply_method_return(m, "s", string));
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return 1;
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}
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static const sd_bus_vtable vtable[] = {
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SD_BUS_VTABLE_START(0),
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SD_BUS_METHOD(
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"Method1", "s", "s", method, 0),
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SD_BUS_METHOD_WITH_NAMES_OFFSET(
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"Method2",
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"so", SD_BUS_PARAM(string) SD_BUS_PARAM(path),
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"s", SD_BUS_PARAM(returnstring),
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method, offsetof(object, number),
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SD_BUS_VTABLE_DEPRECATED),
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SD_BUS_METHOD_WITH_ARGS_OFFSET(
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"Method3",
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SD_BUS_ARGS("s", string, "o", path),
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SD_BUS_RESULT("s", returnstring),
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method, offsetof(object, number),
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SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD_WITH_ARGS(
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"Method4",
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SD_BUS_NO_ARGS,
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SD_BUS_NO_RESULT,
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method,
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SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_SIGNAL(
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"Signal1",
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"so",
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0),
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SD_BUS_SIGNAL_WITH_NAMES(
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"Signal2",
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"so", SD_BUS_PARAM(string) SD_BUS_PARAM(path),
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0),
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SD_BUS_SIGNAL_WITH_ARGS(
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"Signal3",
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SD_BUS_ARGS("s", string, "o", path),
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0),
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SD_BUS_WRITABLE_PROPERTY(
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"AutomaticStringProperty", "s", NULL, NULL,
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offsetof(object, name),
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SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_WRITABLE_PROPERTY(
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"AutomaticIntegerProperty", "u", NULL, NULL,
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offsetof(object, number),
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SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
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SD_BUS_VTABLE_END
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};
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int main(int argc, char **argv) {
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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sd_bus_default(&bus);
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object object = { .number = 666 };
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check((object.name = strdup("name")) != NULL);
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check(sd_bus_add_object_vtable(bus, NULL,
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"/org/freedesktop/systemd/VtableExample",
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"org.freedesktop.systemd.VtableExample",
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vtable,
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&object));
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check(sd_bus_request_name(bus,
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"org.freedesktop.systemd.VtableExample",
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0));
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for (;;) {
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check(sd_bus_wait(bus, UINT64_MAX));
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check(sd_bus_process(bus, NULL));
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}
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check(sd_bus_release_name(bus, "org.freedesktop.systemd.VtableExample"));
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free(object.name);
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return 0;
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}
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