C++ sd_event_source_set_priority函数代码示例

int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
        int r;

        assert(nd);
        assert(nd->event);

        if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
                return -EINVAL;

        if (nd->index < 1)
                return -EINVAL;

        r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
        if (r < 0)
                return r;

        nd->fd = r;

        r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
                            icmp6_router_advertisment_recv, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->recv, nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_source_set_description(nd->recv, "icmp6-receive-message");
        if (r < 0)
                goto error;

        r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
                              0, 0, icmp6_router_solicitation_timeout, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->timeout, nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
error:
        if (r < 0)
                icmp6_nd_init(nd);
        else
                log_icmp6_nd(client, "Start Router Solicitation");

        return r;
}

static int ipv4acd_set_next_wakeup(sd_ipv4acd *acd, usec_t usec, usec_t random_usec) {
        _cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL;
        usec_t next_timeout, time_now;
        int r;

        assert(acd);

        next_timeout = usec;

        if (random_usec > 0)
                next_timeout += (usec_t) random_u64() % random_usec;

        assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &time_now) >= 0);

        r = sd_event_add_time(acd->event, &timer, clock_boottime_or_monotonic(), time_now + next_timeout, 0, ipv4acd_on_timeout, acd);
        if (r < 0)
                return r;

        r = sd_event_source_set_priority(timer, acd->event_priority);
        if (r < 0)
                return r;

        (void) sd_event_source_set_description(timer, "ipv4acd-timer");

        sd_event_source_unref(acd->timer_event_source);
        acd->timer_event_source = timer;
        timer = NULL;

        return 0;
}

_public_ int sd_lldp_start(sd_lldp *lldp) {
        int r;

        assert_return(lldp, -EINVAL);

        if (lldp->fd >= 0)
                return 0;

        assert(!lldp->io_event_source);

        lldp->fd = lldp_network_bind_raw_socket(lldp->ifindex);
        if (lldp->fd < 0)
                return lldp->fd;

        if (lldp->event) {
                r = sd_event_add_io(lldp->event, &lldp->io_event_source, lldp->fd, EPOLLIN, lldp_receive_datagram, lldp);
                if (r < 0)
                        goto fail;

                r = sd_event_source_set_priority(lldp->io_event_source, lldp->event_priority);
                if (r < 0)
                        goto fail;

                (void) sd_event_source_set_description(lldp->io_event_source, "lldp-io");
        }

        return 1;

fail:
        lldp->io_event_source = sd_event_source_unref(lldp->io_event_source);
        lldp->fd = safe_close(lldp->fd);

        return r;
}

static int pppoe_arm_timeout(sd_pppoe *ppp) {
        _cleanup_event_source_unref_ sd_event_source *timeout = NULL;
        usec_t next_timeout;
        int r;

        assert(ppp);

        r = sd_event_now(ppp->event, clock_boottime_or_monotonic(), &next_timeout);
        if (r == -ENODATA)
                next_timeout = now(clock_boottime_or_monotonic());
        else if (r < 0)
                return r;

        next_timeout += 500 * USEC_PER_MSEC;

        r = sd_event_add_time(ppp->event, &timeout, clock_boottime_or_monotonic(), next_timeout,
                              10 * USEC_PER_MSEC, pppoe_timeout, ppp);
        if (r < 0)
                return r;

        r = sd_event_source_set_priority(timeout, ppp->event_priority);
        if (r < 0)
                return r;

        sd_event_source_unref(ppp->timeout);
        ppp->timeout = timeout;
        timeout = NULL;

        return 0;
}

int image_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
        _cleanup_free_ char *e = NULL;
        Manager *m = userdata;
        Image *image = NULL;
        const char *p;
        int r;

        assert(bus);
        assert(path);
        assert(interface);
        assert(found);

        p = startswith(path, "/org/freedesktop/machine1/image/");
        if (!p)
                return 0;

        e = bus_label_unescape(p);
        if (!e)
                return -ENOMEM;

        image = hashmap_get(m->image_cache, e);
        if (image) {
                *found = image;
                return 1;
        }

        r = hashmap_ensure_allocated(&m->image_cache, &string_hash_ops);
        if (r < 0)
                return r;

        if (!m->image_cache_defer_event) {
                r = sd_event_add_defer(m->event, &m->image_cache_defer_event, image_flush_cache, m);
                if (r < 0)
                        return r;

                r = sd_event_source_set_priority(m->image_cache_defer_event, SD_EVENT_PRIORITY_IDLE);
                if (r < 0)
                        return r;
        }

        r = sd_event_source_set_enabled(m->image_cache_defer_event, SD_EVENT_ONESHOT);
        if (r < 0)
                return r;

        r = image_find(e, &image);
        if (r <= 0)
                return r;

        image->userdata = m;

        r = hashmap_put(m->image_cache, image->name, image);
        if (r < 0) {
                image_unref(image);
                return r;
        }

        *found = image;
        return 1;
}

int sd_ipv4ll_start (sd_ipv4ll *ll) {
        int r;

        assert_return(ll, -EINVAL);
        assert_return(ll->event, -EINVAL);
        assert_return(ll->index > 0, -EINVAL);
        assert_return(ll->state == IPV4LL_STATE_INIT, -EBUSY);

        r = arp_network_bind_raw_socket(ll->index, &ll->link);

        if (r < 0)
                goto out;

        ll->fd = r;
        ll->conflict = 0;
        ll->defend_window = 0;
        ll->claimed_address = 0;

        if (ll->address == 0)
                ll->address = ipv4ll_pick_address(ll);

        ipv4ll_set_state (ll, IPV4LL_STATE_INIT, 1);

        r = sd_event_add_io(ll->event, &ll->receive_message, ll->fd,
                            EPOLLIN, ipv4ll_receive_message, ll);
        if (r < 0)
                goto out;

        r = sd_event_source_set_priority(ll->receive_message, ll->event_priority);
        if (r < 0)
                goto out;

        r = sd_event_add_monotonic(ll->event, &ll->timer, now(CLOCK_MONOTONIC), 0,
                                   ipv4ll_timer, ll);

        if (r < 0)
                goto out;

        r = sd_event_source_set_priority(ll->timer, ll->event_priority);

out:
        if (r < 0)
                ipv4ll_stop(ll, IPV4LL_EVENT_STOP);

        return 0;
}

static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
                                             void *userdata)
{
        sd_icmp6_nd *nd = userdata;
        uint64_t time_now, next_timeout;
        struct ether_addr unset = { };
        struct ether_addr *addr = NULL;
        int r;

        assert(s);
        assert(nd);
        assert(nd->event);

        nd->timeout = sd_event_source_unref(nd->timeout);

        if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) {
                icmp6_nd_notify(nd, ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
                nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
        } else {
                if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
                        addr = &nd->mac_addr;

                r = dhcp_network_icmp6_send_router_solicitation(nd->fd, addr);
                if (r < 0)
                        log_icmp6_nd(nd, "Error sending Router Solicitation");
                else {
                        nd->state = ICMP6_ROUTER_SOLICITATION_SENT;
                        log_icmp6_nd(nd, "Sent Router Solicitation");
                }

                nd->nd_sent++;

                r = sd_event_now(nd->event, CLOCK_MONOTONIC, &time_now);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }

                next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL;

                r = sd_event_add_time(nd->event, &nd->timeout, CLOCK_MONOTONIC,
                                      next_timeout, 0,
                                      icmp6_router_solicitation_timeout, nd);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }

                r = sd_event_source_set_priority(nd->timeout,
                                                 nd->event_priority);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }
        }

        return 0;
}

int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
        int r;

        assert(nd);
        assert(nd->event);

        if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
                return -EINVAL;

        if (nd->index < 1)
                return -EINVAL;

        r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
        if (r < 0)
                return r;

        nd->fd = r;

        r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
                            icmp6_router_advertisment_recv, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->recv, nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_add_time(nd->event, &nd->timeout, CLOCK_MONOTONIC,
                              0, 0, icmp6_router_solicitation_timeout, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->timeout, nd->event_priority);

error:
        if (r < 0)
                icmp6_nd_init(nd);
        else
                log_icmp6_nd(client, "Start Router Solicitation");

        return r;
}

static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
        _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
        sd_id128_t id;
        int r;

        assert(s);
        assert(fd >= 0);

        r = sd_id128_randomize(&id);
        if (r < 0)
                return log_error_errno(r, "Failed to generate stream ID: %m");

        stream = new0(StdoutStream, 1);
        if (!stream)
                return log_oom();

        stream->fd = -1;
        stream->priority = LOG_INFO;

        xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));

        r = getpeercred(fd, &stream->ucred);
        if (r < 0)
                return log_error_errno(r, "Failed to determine peer credentials: %m");

        if (mac_selinux_use()) {
                r = getpeersec(fd, &stream->label);
                if (r < 0 && r != -EOPNOTSUPP)
                        (void) log_warning_errno(r, "Failed to determine peer security context: %m");
        }

        (void) shutdown(fd, SHUT_WR);

        r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
        if (r < 0)
                return log_error_errno(r, "Failed to add stream to event loop: %m");

        r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
        if (r < 0)
                return log_error_errno(r, "Failed to adjust stdout event source priority: %m");

        stream->fd = fd;

        stream->server = s;
        LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
        s->n_stdout_streams++;

        if (ret)
                *ret = stream;

        stream = NULL;

        return 0;
}

int server_open_native_socket(Server*s) {

        static const union sockaddr_union sa = {
                .un.sun_family = AF_UNIX,
                .un.sun_path = "/run/systemd/journal/socket",
        };
        static const int one = 1;
        int r;

        assert(s);

        if (s->native_fd < 0) {
                s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
                if (s->native_fd < 0)
                        return log_error_errno(errno, "socket() failed: %m");

                (void) unlink(sa.un.sun_path);

                r = bind(s->native_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
                if (r < 0)
                        return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);

                (void) chmod(sa.un.sun_path, 0666);
        } else
                fd_nonblock(s->native_fd, 1);

        r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
        if (r < 0)
                return log_error_errno(errno, "SO_PASSCRED failed: %m");

#ifdef HAVE_SELINUX
        if (mac_selinux_use()) {
                r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
                if (r < 0)
                        log_warning_errno(errno, "SO_PASSSEC failed: %m");
        }
#endif

        r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
        if (r < 0)
                return log_error_errno(errno, "SO_TIMESTAMP failed: %m");

        r = sd_event_add_io(s->event, &s->native_event_source, s->native_fd, EPOLLIN, server_process_datagram, s);
        if (r < 0)
                return log_error_errno(r, "Failed to add native server fd to event loop: %m");

        r = sd_event_source_set_priority(s->native_event_source, SD_EVENT_PRIORITY_NORMAL+5);
        if (r < 0)
                return log_error_errno(r, "Failed to adjust native event source priority: %m");

        return 0;
}

int sd_pppoe_start(sd_pppoe *ppp) {
        union sockaddr_union link = {
                .ll = {
                        .sll_family = AF_PACKET,
                        .sll_protocol = htons(ETH_P_PPP_DISC),
                },
        };
        _cleanup_close_ int s = -1;
        _cleanup_event_source_unref_ sd_event_source *io = NULL;
        int r;

        assert_return(ppp, -EINVAL);
        assert_return(ppp->fd == -1, -EBUSY);
        assert_return(!ppp->io, -EBUSY);
        assert_return(ppp->ifindex > 0, -EUNATCH);
        assert_return(ppp->ifname, -EUNATCH);
        assert_return(ppp->event, -EUNATCH);
        assert_return(ppp->cb, -EUNATCH);

        s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
        if (s < 0)
                return -errno;

        link.ll.sll_ifindex = ppp->ifindex;

        r = bind(s, &link.sa, sizeof(link.ll));
        if (r < 0)
                return r;

        r = sd_event_add_io(ppp->event, &io,
                            s, EPOLLIN, pppoe_receive_message,
                            ppp);
        if (r < 0)
                return r;

        r = sd_event_source_set_priority(io, ppp->event_priority);
        if (r < 0)
                return r;

        ppp->fd = s;
        s = -1;
        ppp->io = io;
        io = NULL;

        r = pppoe_send_initiation(ppp);
        if (r < 0)
                return r;

        ppp->state = PPPOE_STATE_INITIALIZING;

        return 0;
}

int server_open_dev_kmsg(Server *s) {
        mode_t mode;
        int r;

        assert(s);

        if (s->read_kmsg)
                mode = O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY;
        else
                mode = O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY;

        s->dev_kmsg_fd = open("/dev/kmsg", mode);
        if (s->dev_kmsg_fd < 0) {
                log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
                         "Failed to open /dev/kmsg, ignoring: %m");
                return 0;
        }

        if (!s->read_kmsg)
                return 0;

        r = sd_event_add_io(s->event, &s->dev_kmsg_event_source, s->dev_kmsg_fd, EPOLLIN, dispatch_dev_kmsg, s);
        if (r < 0) {

                /* This will fail with EPERM on older kernels where
                 * /dev/kmsg is not readable. */
                if (r == -EPERM) {
                        r = 0;
                        goto fail;
                }

                log_error_errno(r, "Failed to add /dev/kmsg fd to event loop: %m");
                goto fail;
        }

        r = sd_event_source_set_priority(s->dev_kmsg_event_source, SD_EVENT_PRIORITY_IMPORTANT+10);
        if (r < 0) {
                log_error_errno(r, "Failed to adjust priority of kmsg event source: %m");
                goto fail;
        }

        s->dev_kmsg_readable = true;

        return 0;

fail:
        s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source);
        s->dev_kmsg_fd = safe_close(s->dev_kmsg_fd);

        return r;
}

static int client_initialize_events(sd_dhcp_client *client,
                                    sd_event_io_handler_t io_callback) {
        int r;

        assert(client);
        assert(client->event);

        r = sd_event_add_io(client->event, &client->receive_message,
                            client->fd, EPOLLIN, io_callback,
                            client);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(client->receive_message,
                                         client->event_priority);
        if (r < 0)
                goto error;

        client->timeout_resend = sd_event_source_unref(client->timeout_resend);

        r = sd_event_add_time(client->event,
                              &client->timeout_resend,
                              CLOCK_MONOTONIC,
                              0, 0,
                              client_timeout_resend, client);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(client->timeout_resend,
                                         client->event_priority);

error:
        if (r < 0)
                client_stop(client, r);

        return 0;

}

static void test_rtqueue(void) {
        sd_event_source *u = NULL, *v = NULL, *s = NULL;
        sd_event *e = NULL;

        assert_se(sd_event_default(&e) >= 0);

        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+2, SIGRTMIN+3, SIGUSR2, -1) >= 0);
        assert_se(sd_event_add_signal(e, &u, SIGRTMIN+2, rtqueue_handler, NULL) >= 0);
        assert_se(sd_event_add_signal(e, &v, SIGRTMIN+3, rtqueue_handler, NULL) >= 0);
        assert_se(sd_event_add_signal(e, &s, SIGUSR2, rtqueue_handler, NULL) >= 0);

        assert_se(sd_event_source_set_priority(v, -10) >= 0);

        assert(sigqueue(getpid(), SIGRTMIN+2, (union sigval) { .sival_int = 1 }) >= 0);

static int button_install_check_event_source(Button *b) {
        int r;
        assert(b);

        /* Install a post handler, so that we keep rechecking as long as the lid is closed. */

        if (b->check_event_source)
                return 0;

        r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
        if (r < 0)
                return r;

        return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
}