29f6aadd53
If nobody keeps the serial number of an outgoing message we know that nobody expects an answer to it, so set the no_reply flag accordingly.
1734 lines
46 KiB
C
1734 lines
46 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <endian.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <sys/poll.h>
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#include <byteswap.h>
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#include "util.h"
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#include "macro.h"
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#include "sd-bus.h"
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#include "bus-internal.h"
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#include "bus-message.h"
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#include "bus-type.h"
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#define WQUEUE_MAX 128
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static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
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static void bus_free(sd_bus *b) {
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struct filter_callback *f;
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unsigned i;
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assert(b);
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if (b->fd >= 0)
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close_nointr_nofail(b->fd);
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free(b->rbuffer);
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free(b->unique_name);
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free(b->auth_uid);
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free(b->address);
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for (i = 0; i < b->rqueue_size; i++)
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sd_bus_message_unref(b->rqueue[i]);
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free(b->rqueue);
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for (i = 0; i < b->wqueue_size; i++)
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sd_bus_message_unref(b->wqueue[i]);
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free(b->wqueue);
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hashmap_free_free(b->reply_callbacks);
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prioq_free(b->reply_callbacks_prioq);
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while ((f = b->filter_callbacks)) {
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LIST_REMOVE(struct filter_callback, callbacks, b->filter_callbacks, f);
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free(f);
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}
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free(b);
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}
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static sd_bus* bus_new(void) {
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sd_bus *r;
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r = new0(sd_bus, 1);
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if (!r)
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return NULL;
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r->n_ref = 1;
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r->fd = -1;
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r->message_version = 1;
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/* We guarantee that wqueue always has space for at least one
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* entry */
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r->wqueue = new(sd_bus_message*, 1);
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if (!r->wqueue) {
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free(r);
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return NULL;
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}
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return r;
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};
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static int hello_callback(sd_bus *bus, int error, sd_bus_message *reply, void *userdata) {
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const char *s;
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int r;
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assert(bus);
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if (error != 0)
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return -error;
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assert(reply);
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bus->state = BUS_RUNNING;
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r = sd_bus_message_read(reply, "s", &s);
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if (r < 0)
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return r;
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bus->unique_name = strdup(s);
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if (!bus->unique_name)
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return -ENOMEM;
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return 1;
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}
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static int bus_send_hello(sd_bus *bus) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert(bus);
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r = sd_bus_message_new_method_call(
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bus,
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"org.freedesktop.DBus",
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"/",
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"org.freedesktop.DBus",
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"Hello",
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&m);
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if (r < 0)
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return r;
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r = sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, NULL);
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if (r < 0)
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return r;
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bus->sent_hello = true;
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return r;
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}
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static int bus_start_running(sd_bus *bus) {
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assert(bus);
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if (bus->sent_hello) {
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bus->state = BUS_HELLO;
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return 1;
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}
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bus->state = BUS_RUNNING;
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return 1;
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}
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static int parse_address_key(const char **p, const char *key, char **value) {
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size_t l, n = 0;
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const char *a;
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char *r = NULL;
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assert(p);
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assert(*p);
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assert(key);
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assert(value);
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l = strlen(key);
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if (strncmp(*p, key, l) != 0)
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return 0;
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if ((*p)[l] != '=')
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return 0;
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if (*value)
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return -EINVAL;
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a = *p + l + 1;
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while (*a != ',' && *a != 0) {
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char c, *t;
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if (*a == '%') {
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int x, y;
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x = unhexchar(a[1]);
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if (x < 0) {
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free(r);
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return x;
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}
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y = unhexchar(a[2]);
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if (y < 0) {
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free(r);
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return y;
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}
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c = (char) ((x << 4) | y);
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a += 3;
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} else {
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c = *a;
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a++;
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}
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t = realloc(r, n + 2);
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if (!t) {
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free(r);
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return -ENOMEM;
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}
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r = t;
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r[n++] = c;
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}
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if (!r) {
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r = strdup("");
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if (!r)
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return -ENOMEM;
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} else
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r[n] = 0;
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if (*a == ',')
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a++;
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*p = a;
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*value = r;
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return 1;
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}
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static void skip_address_key(const char **p) {
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assert(p);
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assert(*p);
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*p += strcspn(*p, ",");
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if (**p == ',')
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(*p) ++;
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}
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static int bus_parse_next_address(sd_bus *b) {
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const char *a, *p;
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_cleanup_free_ char *guid = NULL;
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int r;
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assert(b);
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if (!b->address)
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return 0;
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if (b->address[b->address_index] == 0)
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return 0;
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a = b->address + b->address_index;
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zero(b->sockaddr);
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b->sockaddr_size = 0;
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b->peer = SD_ID128_NULL;
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if (startswith(a, "unix:")) {
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_cleanup_free_ char *path = NULL, *abstract = NULL;
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p = a + 5;
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while (*p != 0) {
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r = parse_address_key(&p, "guid", &guid);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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r = parse_address_key(&p, "path", &path);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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r = parse_address_key(&p, "abstract", &abstract);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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skip_address_key(&p);
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}
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if (!path && !abstract)
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return -EINVAL;
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if (path && abstract)
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return -EINVAL;
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if (path) {
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size_t l;
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l = strlen(path);
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if (l > sizeof(b->sockaddr.un.sun_path))
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return -E2BIG;
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b->sockaddr.un.sun_family = AF_UNIX;
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strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
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b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
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} else if (abstract) {
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size_t l;
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l = strlen(abstract);
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if (l > sizeof(b->sockaddr.un.sun_path) - 1)
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return -E2BIG;
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b->sockaddr.un.sun_family = AF_UNIX;
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b->sockaddr.un.sun_path[0] = 0;
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strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
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b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
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}
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} else if (startswith(a, "tcp:")) {
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_cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
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struct addrinfo hints, *result;
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p = a + 4;
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while (*p != 0) {
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r = parse_address_key(&p, "guid", &guid);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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r = parse_address_key(&p, "host", &host);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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r = parse_address_key(&p, "port", &port);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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r = parse_address_key(&p, "family", &family);
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if (r < 0)
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return r;
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else if (r > 0)
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continue;
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skip_address_key(&p);
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}
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if (!host || !port)
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return -EINVAL;
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zero(hints);
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_ADDRCONFIG;
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if (family) {
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if (streq(family, "ipv4"))
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hints.ai_family = AF_INET;
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else if (streq(family, "ipv6"))
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hints.ai_family = AF_INET6;
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else
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return -EINVAL;
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}
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r = getaddrinfo(host, port, &hints, &result);
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if (r == EAI_SYSTEM)
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return -errno;
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else if (r != 0)
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return -EADDRNOTAVAIL;
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memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
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b->sockaddr_size = result->ai_addrlen;
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freeaddrinfo(result);
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}
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if (guid) {
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r = sd_id128_from_string(guid, &b->peer);
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if (r < 0)
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return r;
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}
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b->address_index = p - b->address;
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return 1;
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}
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static void iovec_advance(struct iovec *iov, unsigned *idx, size_t size) {
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while (size > 0) {
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struct iovec *i = iov + *idx;
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if (i->iov_len > size) {
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i->iov_base = (uint8_t*) i->iov_base + size;
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i->iov_len -= size;
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return;
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}
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size -= i->iov_len;
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i->iov_base = NULL;
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i->iov_len = 0;
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(*idx) ++;
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}
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}
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static int bus_write_auth(sd_bus *b) {
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struct msghdr mh;
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ssize_t k;
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assert(b);
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assert(b->state == BUS_AUTHENTICATING);
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if (b->auth_index >= ELEMENTSOF(b->auth_iovec))
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return 0;
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if (b->auth_timeout == 0)
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b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT;
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zero(mh);
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mh.msg_iov = b->auth_iovec + b->auth_index;
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mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index;
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k = sendmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
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if (k < 0)
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return errno == EAGAIN ? 0 : -errno;
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iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k);
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return 1;
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}
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static int bus_auth_verify(sd_bus *b) {
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char *e, *f;
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sd_id128_t peer;
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unsigned i;
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int r;
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/* We expect two response lines: "OK", "AGREE_UNIX_FD", and
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* that's it */
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e = memmem(b->rbuffer, b->rbuffer_size, "\r\n", 2);
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if (!e)
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return 0;
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f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
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if (!f)
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return 0;
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if (e - (char*) b->rbuffer != 3 + 32)
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return -EPERM;
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if (memcmp(b->rbuffer, "OK ", 3))
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return -EPERM;
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for (i = 0; i < 32; i += 2) {
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int x, y;
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x = unhexchar(((char*) b->rbuffer)[3 + i]);
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y = unhexchar(((char*) b->rbuffer)[3 + i + 1]);
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if (x < 0 || y < 0)
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return -EINVAL;
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peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y);
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}
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if (!sd_id128_equal(b->peer, SD_ID128_NULL) &&
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!sd_id128_equal(b->peer, peer))
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return -EPERM;
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|
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b->peer = peer;
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|
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b->can_fds =
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(f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) &&
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memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0;
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b->rbuffer_size -= (f + 2 - (char*) b->rbuffer);
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memmove(b->rbuffer, f + 2, b->rbuffer_size);
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|
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r = bus_start_running(b);
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if (r < 0)
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return r;
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|
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return 1;
|
|
}
|
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|
|
static int bus_read_auth(sd_bus *b) {
|
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struct msghdr mh;
|
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struct iovec iov;
|
|
size_t n;
|
|
ssize_t k;
|
|
int r;
|
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void *p;
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|
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assert(b);
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|
|
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r = bus_auth_verify(b);
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if (r != 0)
|
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return r;
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|
|
n = MAX(3 + 32 + 2 + sizeof("AGREE_UNIX_FD") - 1 + 2, b->rbuffer_size * 2);
|
|
p = realloc(b->rbuffer, n);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
b->rbuffer = p;
|
|
|
|
zero(iov);
|
|
iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size;
|
|
iov.iov_len = n - b->rbuffer_size;
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|
|
|
zero(mh);
|
|
mh.msg_iov = &iov;
|
|
mh.msg_iovlen = 1;
|
|
|
|
k = recvmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
|
|
if (k < 0)
|
|
return errno == EAGAIN ? 0 : -errno;
|
|
|
|
b->rbuffer_size += k;
|
|
|
|
r = bus_auth_verify(b);
|
|
if (r != 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int bus_start_auth(sd_bus *b) {
|
|
static const char auth_prefix[] = "\0AUTH EXTERNAL ";
|
|
static const char auth_suffix[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n";
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|
|
|
char text[20 + 1]; /* enough space for a 64bit integer plus NUL */
|
|
size_t l;
|
|
|
|
assert(b);
|
|
|
|
b->state = BUS_AUTHENTICATING;
|
|
|
|
snprintf(text, sizeof(text), "%llu", (unsigned long long) geteuid());
|
|
char_array_0(text);
|
|
|
|
l = strlen(text);
|
|
b->auth_uid = hexmem(text, l);
|
|
if (!b->auth_uid)
|
|
return -ENOMEM;
|
|
|
|
b->auth_iovec[0].iov_base = (void*) auth_prefix;
|
|
b->auth_iovec[0].iov_len = sizeof(auth_prefix) -1;
|
|
b->auth_iovec[1].iov_base = (void*) b->auth_uid;
|
|
b->auth_iovec[1].iov_len = l * 2;
|
|
b->auth_iovec[2].iov_base = (void*) auth_suffix;
|
|
b->auth_iovec[2].iov_len = sizeof(auth_suffix) -1;
|
|
b->auth_size = sizeof(auth_prefix) - 1 + l * 2 + sizeof(auth_suffix) - 1;
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|
|
return bus_write_auth(b);
|
|
}
|
|
|
|
static int bus_start_connect(sd_bus *b) {
|
|
int r;
|
|
|
|
assert(b);
|
|
assert(b->fd < 0);
|
|
|
|
for (;;) {
|
|
if (b->sockaddr.sa.sa_family == AF_UNSPEC) {
|
|
r = bus_parse_next_address(b);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
|
|
}
|
|
|
|
b->fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
|
if (b->fd < 0) {
|
|
b->last_connect_error = errno;
|
|
zero(b->sockaddr);
|
|
continue;
|
|
}
|
|
|
|
r = connect(b->fd, &b->sockaddr.sa, b->sockaddr_size);
|
|
if (r < 0) {
|
|
if (errno == EINPROGRESS)
|
|
return 1;
|
|
|
|
b->last_connect_error = errno;
|
|
close_nointr_nofail(b->fd);
|
|
b->fd = -1;
|
|
zero(b->sockaddr);
|
|
continue;
|
|
}
|
|
|
|
return bus_start_auth(b);
|
|
}
|
|
}
|
|
|
|
int sd_bus_open_system(sd_bus **ret) {
|
|
const char *e;
|
|
sd_bus *b;
|
|
int r;
|
|
|
|
if (!ret)
|
|
return -EINVAL;
|
|
|
|
e = getenv("DBUS_SYSTEM_BUS_ADDRESS");
|
|
if (e) {
|
|
r = sd_bus_open_address(e, &b);
|
|
if (r < 0)
|
|
return r;
|
|
} else {
|
|
b = bus_new();
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
b->sockaddr.un.sun_family = AF_UNIX;
|
|
strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
|
|
b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1;
|
|
|
|
r = bus_start_connect(b);
|
|
if (r < 0) {
|
|
bus_free(b);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
r = bus_send_hello(b);
|
|
if (r < 0) {
|
|
sd_bus_unref(b);
|
|
return r;
|
|
}
|
|
|
|
*ret = b;
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_open_user(sd_bus **ret) {
|
|
const char *e;
|
|
sd_bus *b;
|
|
size_t l;
|
|
int r;
|
|
|
|
if (!ret)
|
|
return -EINVAL;
|
|
|
|
e = getenv("DBUS_SESSION_BUS_ADDRESS");
|
|
if (e) {
|
|
r = sd_bus_open_address(e, &b);
|
|
if (r < 0)
|
|
return r;
|
|
} else {
|
|
e = getenv("XDG_RUNTIME_DIR");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
l = strlen(e);
|
|
if (l + 4 > sizeof(b->sockaddr.un.sun_path))
|
|
return -E2BIG;
|
|
|
|
b = bus_new();
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
b->sockaddr.un.sun_family = AF_UNIX;
|
|
memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4);
|
|
b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4;
|
|
|
|
r = bus_start_connect(b);
|
|
if (r < 0) {
|
|
bus_free(b);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
r = bus_send_hello(b);
|
|
if (r < 0) {
|
|
sd_bus_unref(b);
|
|
return r;
|
|
}
|
|
|
|
*ret = b;
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_open_address(const char *address, sd_bus **ret) {
|
|
sd_bus *b;
|
|
int r;
|
|
|
|
if (!address)
|
|
return -EINVAL;
|
|
if (!ret)
|
|
return -EINVAL;
|
|
|
|
b = bus_new();
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
b->address = strdup(address);
|
|
if (!b->address) {
|
|
bus_free(b);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
r = bus_start_connect(b);
|
|
if (r < 0) {
|
|
bus_free(b);
|
|
return r;
|
|
}
|
|
|
|
*ret = b;
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_open_fd(int fd, sd_bus **ret) {
|
|
sd_bus *b;
|
|
int r;
|
|
|
|
if (fd < 0)
|
|
return -EINVAL;
|
|
if (!ret)
|
|
return -EINVAL;
|
|
|
|
b = bus_new();
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
b->fd = fd;
|
|
fd_nonblock(b->fd, true);
|
|
fd_cloexec(b->fd, true);
|
|
|
|
r = bus_start_auth(b);
|
|
if (r < 0) {
|
|
bus_free(b);
|
|
return r;
|
|
}
|
|
|
|
*ret = b;
|
|
return 0;
|
|
}
|
|
|
|
void sd_bus_close(sd_bus *bus) {
|
|
if (!bus)
|
|
return;
|
|
if (bus->fd < 0)
|
|
return;
|
|
|
|
close_nointr_nofail(bus->fd);
|
|
bus->fd = -1;
|
|
}
|
|
|
|
sd_bus *sd_bus_ref(sd_bus *bus) {
|
|
if (!bus)
|
|
return NULL;
|
|
|
|
assert(bus->n_ref > 0);
|
|
|
|
bus->n_ref++;
|
|
return bus;
|
|
}
|
|
|
|
sd_bus *sd_bus_unref(sd_bus *bus) {
|
|
if (!bus)
|
|
return NULL;
|
|
|
|
assert(bus->n_ref > 0);
|
|
bus->n_ref--;
|
|
|
|
if (bus->n_ref <= 0)
|
|
bus_free(bus);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int sd_bus_is_open(sd_bus *bus) {
|
|
if (!bus)
|
|
return -EINVAL;
|
|
|
|
return bus->fd >= 0;
|
|
}
|
|
|
|
int sd_bus_is_running(sd_bus *bus) {
|
|
if (!bus)
|
|
return -EINVAL;
|
|
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
return bus->state == BUS_RUNNING;
|
|
}
|
|
|
|
int sd_bus_can_send(sd_bus *bus, char type) {
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO)
|
|
return -EAGAIN;
|
|
|
|
if (type == SD_BUS_TYPE_UNIX_FD)
|
|
return bus->can_fds;
|
|
|
|
return bus_type_is_valid(type);
|
|
}
|
|
|
|
static int bus_seal_message(sd_bus *b, sd_bus_message *m) {
|
|
assert(m);
|
|
|
|
if (m->header->version > b->message_version)
|
|
return -EPERM;
|
|
|
|
if (m->sealed)
|
|
return 0;
|
|
|
|
return bus_message_seal(m, ++b->serial);
|
|
}
|
|
|
|
static int message_write(sd_bus *bus, sd_bus_message *m, size_t *idx) {
|
|
struct msghdr mh;
|
|
struct iovec *iov;
|
|
ssize_t k;
|
|
size_t n;
|
|
unsigned j;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
assert(idx);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
if (*idx >= m->size)
|
|
return 0;
|
|
|
|
n = m->n_iovec * sizeof(struct iovec);
|
|
iov = alloca(n);
|
|
memcpy(iov, m->iovec, n);
|
|
|
|
j = 0;
|
|
iovec_advance(iov, &j, *idx);
|
|
|
|
zero(mh);
|
|
mh.msg_iov = iov;
|
|
mh.msg_iovlen = m->n_iovec;
|
|
|
|
k = sendmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
|
|
if (k < 0)
|
|
return errno == EAGAIN ? 0 : -errno;
|
|
|
|
*idx += (size_t) k;
|
|
return 1;
|
|
}
|
|
|
|
static int message_read_need(sd_bus *bus, size_t *need) {
|
|
uint32_t a, b;
|
|
uint8_t e;
|
|
|
|
assert(bus);
|
|
assert(need);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
if (bus->rbuffer_size < sizeof(struct bus_header)) {
|
|
*need = sizeof(struct bus_header) + 8;
|
|
|
|
/* Minimum message size:
|
|
*
|
|
* Header +
|
|
*
|
|
* Method Call: +2 string headers
|
|
* Signal: +3 string headers
|
|
* Method Error: +1 string headers
|
|
* +1 uint32 headers
|
|
* Method Reply: +1 uint32 headers
|
|
*
|
|
* A string header is at least 9 bytes
|
|
* A uint32 header is at least 8 bytes
|
|
*
|
|
* Hence the minimum message size of a valid message
|
|
* is header + 8 bytes */
|
|
|
|
return 0;
|
|
}
|
|
|
|
a = ((const uint32_t*) bus->rbuffer)[1];
|
|
b = ((const uint32_t*) bus->rbuffer)[3];
|
|
|
|
e = ((const uint8_t*) bus->rbuffer)[0];
|
|
if (e == SD_BUS_LITTLE_ENDIAN) {
|
|
a = le32toh(a);
|
|
b = le32toh(b);
|
|
} else if (e == SD_BUS_BIG_ENDIAN) {
|
|
a = be32toh(a);
|
|
b = be32toh(b);
|
|
} else
|
|
return -EBADMSG;
|
|
|
|
*need = sizeof(struct bus_header) + ALIGN_TO(b, 8) + a;
|
|
return 0;
|
|
}
|
|
|
|
static int message_make(sd_bus *bus, size_t size, sd_bus_message **m) {
|
|
sd_bus_message *t;
|
|
void *b = NULL;
|
|
int r;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
assert(bus->rbuffer_size >= size);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
if (bus->rbuffer_size > size) {
|
|
b = memdup((const uint8_t*) bus->rbuffer + size, bus->rbuffer_size - size);
|
|
if (!b) {
|
|
free(t);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
r = bus_message_from_malloc(bus->rbuffer, size, &t);
|
|
if (r < 0) {
|
|
free(b);
|
|
return r;
|
|
}
|
|
|
|
bus->rbuffer = b;
|
|
bus->rbuffer_size -= size;
|
|
|
|
*m = t;
|
|
return 1;
|
|
}
|
|
|
|
static int message_read(sd_bus *bus, sd_bus_message **m) {
|
|
struct msghdr mh;
|
|
struct iovec iov;
|
|
ssize_t k;
|
|
size_t need;
|
|
int r;
|
|
void *b;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
r = message_read_need(bus, &need);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (bus->rbuffer_size >= need)
|
|
return message_make(bus, need, m);
|
|
|
|
b = realloc(bus->rbuffer, need);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
bus->rbuffer = b;
|
|
|
|
zero(iov);
|
|
iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size;
|
|
iov.iov_len = need - bus->rbuffer_size;
|
|
|
|
zero(mh);
|
|
mh.msg_iov = &iov;
|
|
mh.msg_iovlen = 1;
|
|
|
|
k = recvmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
|
|
if (k < 0)
|
|
return errno == EAGAIN ? 0 : -errno;
|
|
|
|
bus->rbuffer_size += k;
|
|
|
|
r = message_read_need(bus, &need);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (bus->rbuffer_size >= need)
|
|
return message_make(bus, need, m);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int dispatch_wqueue(sd_bus *bus) {
|
|
int r, ret = 0;
|
|
|
|
assert(bus);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
while (bus->wqueue_size > 0) {
|
|
|
|
r = message_write(bus, bus->wqueue[0], &bus->windex);
|
|
if (r < 0) {
|
|
sd_bus_close(bus);
|
|
return r;
|
|
} else if (r == 0)
|
|
/* Didn't do anything this time */
|
|
return ret;
|
|
else if (bus->windex >= bus->wqueue[0]->size) {
|
|
/* Fully written. Let's drop the entry from
|
|
* the queue.
|
|
*
|
|
* This isn't particularly optimized, but
|
|
* well, this is supposed to be our worst-case
|
|
* buffer only, and the socket buffer is
|
|
* supposed to be our primary buffer, and if
|
|
* it got full, then all bets are off
|
|
* anyway. */
|
|
|
|
sd_bus_message_unref(bus->wqueue[0]);
|
|
bus->wqueue_size --;
|
|
memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
|
|
bus->windex = 0;
|
|
|
|
ret = 1;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) {
|
|
sd_bus_message *z;
|
|
int r, ret = 0;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
|
|
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
if (bus->rqueue_size > 0) {
|
|
/* Dispatch a queued message */
|
|
|
|
*m = bus->rqueue[0];
|
|
bus->rqueue_size --;
|
|
memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
|
|
return 1;
|
|
}
|
|
|
|
/* Try to read a new message */
|
|
do {
|
|
r = message_read(bus, &z);
|
|
if (r < 0) {
|
|
sd_bus_close(bus);
|
|
return r;
|
|
}
|
|
if (r == 0)
|
|
return ret;
|
|
|
|
r = 1;
|
|
} while (!z);
|
|
|
|
*m = z;
|
|
return 1;
|
|
}
|
|
|
|
int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) {
|
|
int r;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
if (!m)
|
|
return -EINVAL;
|
|
|
|
/* If the serial number isn't kept, then we know that no reply
|
|
* is expected */
|
|
if (!serial && !m->sealed)
|
|
m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
|
|
|
|
r = bus_seal_message(bus, m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* If this is a reply and no reply was requested, then let's
|
|
* suppress this, if we can */
|
|
if (m->dont_send && !serial)
|
|
return 0;
|
|
|
|
if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
|
|
size_t idx = 0;
|
|
|
|
r = message_write(bus, m, &idx);
|
|
if (r < 0) {
|
|
sd_bus_close(bus);
|
|
return r;
|
|
} else if (idx < m->size) {
|
|
/* Wasn't fully written. So let's remember how
|
|
* much was written. Note that the first entry
|
|
* of the wqueue array is always allocated so
|
|
* that we always can remember how much was
|
|
* written. */
|
|
bus->wqueue[0] = sd_bus_message_ref(m);
|
|
bus->wqueue_size = 1;
|
|
bus->windex = idx;
|
|
}
|
|
} else {
|
|
sd_bus_message **q;
|
|
|
|
/* Just append it to the queue. */
|
|
|
|
if (bus->wqueue_size >= WQUEUE_MAX)
|
|
return -ENOBUFS;
|
|
|
|
q = realloc(bus->wqueue, sizeof(sd_bus_message*) * (bus->wqueue_size + 1));
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
bus->wqueue = q;
|
|
q[bus->wqueue_size ++] = sd_bus_message_ref(m);
|
|
}
|
|
|
|
if (serial)
|
|
*serial = BUS_MESSAGE_SERIAL(m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static usec_t calc_elapse(uint64_t usec) {
|
|
if (usec == (uint64_t) -1)
|
|
return 0;
|
|
|
|
if (usec == 0)
|
|
usec = BUS_DEFAULT_TIMEOUT;
|
|
|
|
return now(CLOCK_MONOTONIC) + usec;
|
|
}
|
|
|
|
static int timeout_compare(const void *a, const void *b) {
|
|
const struct reply_callback *x = a, *y = b;
|
|
|
|
if (x->timeout != 0 && y->timeout == 0)
|
|
return -1;
|
|
|
|
if (x->timeout == 0 && y->timeout != 0)
|
|
return 1;
|
|
|
|
if (x->timeout < y->timeout)
|
|
return -1;
|
|
|
|
if (x->timeout > y->timeout)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_send_with_reply(
|
|
sd_bus *bus,
|
|
sd_bus_message *m,
|
|
sd_message_handler_t callback,
|
|
void *userdata,
|
|
uint64_t usec,
|
|
uint64_t *serial) {
|
|
|
|
struct reply_callback *c;
|
|
int r;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
if (!m)
|
|
return -EINVAL;
|
|
if (!callback)
|
|
return -EINVAL;
|
|
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
|
|
return -EINVAL;
|
|
if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
|
|
return -EINVAL;
|
|
|
|
r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (usec != (uint64_t) -1) {
|
|
r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = bus_seal_message(bus, m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
c = new(struct reply_callback, 1);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
c->callback = callback;
|
|
c->userdata = userdata;
|
|
c->serial = BUS_MESSAGE_SERIAL(m);
|
|
c->timeout = calc_elapse(usec);
|
|
|
|
r = hashmap_put(bus->reply_callbacks, &c->serial, c);
|
|
if (r < 0) {
|
|
free(c);
|
|
return r;
|
|
}
|
|
|
|
if (c->timeout != 0) {
|
|
r = prioq_put(bus->reply_callbacks_prioq, c, &c->prioq_idx);
|
|
if (r < 0) {
|
|
c->timeout = 0;
|
|
sd_bus_send_with_reply_cancel(bus, c->serial);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
r = sd_bus_send(bus, m, serial);
|
|
if (r < 0) {
|
|
sd_bus_send_with_reply_cancel(bus, c->serial);
|
|
return r;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int sd_bus_send_with_reply_cancel(sd_bus *bus, uint64_t serial) {
|
|
struct reply_callback *c;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (serial == 0)
|
|
return -EINVAL;
|
|
|
|
c = hashmap_remove(bus->reply_callbacks, &serial);
|
|
if (!c)
|
|
return 0;
|
|
|
|
if (c->timeout != 0)
|
|
prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
|
|
|
|
free(c);
|
|
return 1;
|
|
}
|
|
|
|
static int ensure_running(sd_bus *bus) {
|
|
int r;
|
|
|
|
assert(bus);
|
|
|
|
r = sd_bus_is_running(bus);
|
|
if (r != 0)
|
|
return r;
|
|
|
|
for (;;) {
|
|
int k;
|
|
|
|
r = sd_bus_process(bus, NULL);
|
|
|
|
if (r < 0)
|
|
return r;
|
|
|
|
k = sd_bus_is_running(bus);
|
|
if (k != 0)
|
|
return k;
|
|
|
|
if (r > 0)
|
|
continue;
|
|
|
|
r = sd_bus_wait(bus, (uint64_t) -1);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
int sd_bus_send_with_reply_and_block(
|
|
sd_bus *bus,
|
|
sd_bus_message *m,
|
|
uint64_t usec,
|
|
sd_bus_error *error,
|
|
sd_bus_message **reply) {
|
|
|
|
int r;
|
|
usec_t timeout;
|
|
uint64_t serial;
|
|
bool room = false;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
if (!m)
|
|
return -EINVAL;
|
|
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
|
|
return -EINVAL;
|
|
if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
|
|
return -EINVAL;
|
|
if (bus_error_is_dirty(error))
|
|
return -EINVAL;
|
|
|
|
r = ensure_running(bus);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_send(bus, m, &serial);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
timeout = calc_elapse(usec);
|
|
|
|
for (;;) {
|
|
usec_t left;
|
|
sd_bus_message *incoming = NULL;
|
|
|
|
if (!room) {
|
|
sd_bus_message **q;
|
|
|
|
/* Make sure there's room for queuing this
|
|
* locally, before we read the message */
|
|
|
|
q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*));
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
bus->rqueue = q;
|
|
room = true;
|
|
}
|
|
|
|
r = message_read(bus, &incoming);
|
|
if (r < 0)
|
|
return r;
|
|
if (incoming) {
|
|
|
|
if (incoming->reply_serial == serial) {
|
|
/* Found a match! */
|
|
|
|
if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) {
|
|
*reply = incoming;
|
|
return 0;
|
|
}
|
|
|
|
if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) {
|
|
int k;
|
|
|
|
r = sd_bus_error_copy(error, &incoming->error);
|
|
if (r < 0) {
|
|
sd_bus_message_unref(incoming);
|
|
return r;
|
|
}
|
|
|
|
k = bus_error_to_errno(&incoming->error);
|
|
sd_bus_message_unref(incoming);
|
|
return k;
|
|
}
|
|
|
|
sd_bus_message_unref(incoming);
|
|
return -EIO;
|
|
}
|
|
|
|
/* There's already guaranteed to be room for
|
|
* this, so need to resize things here */
|
|
bus->rqueue[bus->rqueue_size ++] = incoming;
|
|
room = false;
|
|
|
|
/* Try to read more, right-away */
|
|
continue;
|
|
}
|
|
if (r != 0)
|
|
continue;
|
|
|
|
if (timeout > 0) {
|
|
usec_t n;
|
|
|
|
n = now(CLOCK_MONOTONIC);
|
|
if (n >= timeout)
|
|
return -ETIMEDOUT;
|
|
|
|
left = timeout - n;
|
|
} else
|
|
left = (uint64_t) -1;
|
|
|
|
r = bus_poll(bus, true, left);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dispatch_wqueue(bus);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
int sd_bus_get_fd(sd_bus *bus) {
|
|
if (!bus)
|
|
return -EINVAL;
|
|
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
return bus->fd;
|
|
}
|
|
|
|
int sd_bus_get_events(sd_bus *bus) {
|
|
int flags = 0;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
if (bus->state == BUS_OPENING)
|
|
flags |= POLLOUT;
|
|
else if (bus->state == BUS_AUTHENTICATING) {
|
|
|
|
if (bus->auth_index < ELEMENTSOF(bus->auth_iovec))
|
|
flags |= POLLOUT;
|
|
|
|
flags |= POLLIN;
|
|
|
|
} else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
|
|
if (bus->rqueue_size <= 0)
|
|
flags |= POLLIN;
|
|
if (bus->wqueue_size > 0)
|
|
flags |= POLLOUT;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
|
|
struct reply_callback *c;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (!timeout_usec)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
if (bus->state == BUS_AUTHENTICATING) {
|
|
*timeout_usec = bus->auth_timeout;
|
|
return 1;
|
|
}
|
|
|
|
if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO)
|
|
return 0;
|
|
|
|
c = prioq_peek(bus->reply_callbacks_prioq);
|
|
if (!c)
|
|
return 0;
|
|
|
|
*timeout_usec = c->timeout;
|
|
return 1;
|
|
}
|
|
|
|
static int process_timeout(sd_bus *bus) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
|
|
struct reply_callback *c;
|
|
usec_t n;
|
|
int r;
|
|
|
|
assert(bus);
|
|
|
|
c = prioq_peek(bus->reply_callbacks_prioq);
|
|
if (!c)
|
|
return 0;
|
|
|
|
n = now(CLOCK_MONOTONIC);
|
|
if (c->timeout > n)
|
|
return 0;
|
|
|
|
assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
|
|
hashmap_remove(bus->reply_callbacks, &c->serial);
|
|
|
|
r = c->callback(bus, ETIMEDOUT, NULL, c->userdata);
|
|
free(c);
|
|
|
|
return r < 0 ? r : 1;
|
|
}
|
|
|
|
static int process_message(sd_bus *bus, sd_bus_message *m) {
|
|
struct filter_callback *l;
|
|
int r;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
|
|
if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL || m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) {
|
|
struct reply_callback *c;
|
|
|
|
c = hashmap_remove(bus->reply_callbacks, &m->reply_serial);
|
|
if (c) {
|
|
if (c->timeout != 0)
|
|
prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
|
|
|
|
r = c->callback(bus, 0, m, c->userdata);
|
|
free(c);
|
|
|
|
if (r != 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
|
|
r = l->callback(bus, 0, m, l->userdata);
|
|
if (r != 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
|
|
int r;
|
|
|
|
/* Returns 0 when we didn't do anything. This should cause the
|
|
* caller to invoke sd_bus_wait() before returning the next
|
|
* time. Returns > 0 when we did something, which possibly
|
|
* means *ret is filled in with an unprocessed message. */
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
if (bus->state == BUS_OPENING) {
|
|
struct pollfd p;
|
|
|
|
zero(p);
|
|
p.fd = bus->fd;
|
|
p.events = POLLOUT;
|
|
|
|
r = poll(&p, 1, 0);
|
|
if (r < 0)
|
|
return -errno;
|
|
|
|
if (p.revents & (POLLOUT|POLLERR|POLLHUP)) {
|
|
int error = 0;
|
|
socklen_t slen = sizeof(error);
|
|
|
|
r = getsockopt(bus->fd, SOL_SOCKET, SO_ERROR, &error, &slen);
|
|
if (r < 0)
|
|
bus->last_connect_error = errno;
|
|
else if (error != 0)
|
|
bus->last_connect_error = error;
|
|
else if (p.revents & (POLLERR|POLLHUP))
|
|
bus->last_connect_error = ECONNREFUSED;
|
|
else {
|
|
r = bus_start_auth(bus);
|
|
goto null_message;
|
|
}
|
|
|
|
/* Try next address */
|
|
r = bus_start_connect(bus);
|
|
goto null_message;
|
|
}
|
|
|
|
r = 0;
|
|
goto null_message;
|
|
|
|
} else if (bus->state == BUS_AUTHENTICATING) {
|
|
|
|
if (now(CLOCK_MONOTONIC) >= bus->auth_timeout)
|
|
return -ETIMEDOUT;
|
|
|
|
r = bus_write_auth(bus);
|
|
if (r != 0)
|
|
goto null_message;
|
|
|
|
r = bus_read_auth(bus);
|
|
goto null_message;
|
|
|
|
} else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
|
|
int k;
|
|
|
|
r = process_timeout(bus);
|
|
if (r != 0)
|
|
goto null_message;
|
|
|
|
r = dispatch_wqueue(bus);
|
|
if (r != 0)
|
|
goto null_message;
|
|
|
|
k = r;
|
|
r = dispatch_rqueue(bus, &m);
|
|
if (r < 0)
|
|
return r;
|
|
if (!m) {
|
|
if (r == 0)
|
|
r = k;
|
|
goto null_message;
|
|
}
|
|
|
|
r = process_message(bus, m);
|
|
if (r != 0)
|
|
goto null_message;
|
|
|
|
if (ret) {
|
|
*ret = m;
|
|
m = NULL;
|
|
return 1;
|
|
}
|
|
|
|
if (sd_bus_message_is_method_call(m, NULL, NULL)) {
|
|
const sd_bus_error e = SD_BUS_ERROR_INIT_CONST("org.freedesktop.DBus.Error.UnknownObject", "Unknown object.");
|
|
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
|
|
|
|
r = sd_bus_message_new_method_error(bus, m, &e, &reply);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_send(bus, reply, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
assert_not_reached("Unknown state");
|
|
|
|
null_message:
|
|
if (r >= 0 && ret)
|
|
*ret = NULL;
|
|
|
|
return r;
|
|
}
|
|
|
|
static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
|
|
struct pollfd p;
|
|
int r, e;
|
|
struct timespec ts;
|
|
usec_t until, m;
|
|
|
|
assert(bus);
|
|
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
e = sd_bus_get_events(bus);
|
|
if (e < 0)
|
|
return e;
|
|
|
|
if (need_more)
|
|
e |= POLLIN;
|
|
|
|
r = sd_bus_get_timeout(bus, &until);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
m = (uint64_t) -1;
|
|
else {
|
|
usec_t n;
|
|
n = now(CLOCK_MONOTONIC);
|
|
m = until > n ? until - n : 0;
|
|
}
|
|
|
|
if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
|
|
m = timeout_usec;
|
|
|
|
zero(p);
|
|
p.fd = bus->fd;
|
|
p.events = e;
|
|
|
|
r = ppoll(&p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
|
|
if (r < 0)
|
|
return -errno;
|
|
|
|
return r > 0 ? 1 : 0;
|
|
}
|
|
|
|
int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
if (bus->rqueue_size > 0)
|
|
return 0;
|
|
|
|
return bus_poll(bus, false, timeout_usec);
|
|
}
|
|
|
|
int sd_bus_flush(sd_bus *bus) {
|
|
int r;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (bus->fd < 0)
|
|
return -ENOTCONN;
|
|
|
|
r = ensure_running(bus);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (bus->wqueue_size <= 0)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
r = dispatch_wqueue(bus);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (bus->wqueue_size <= 0)
|
|
return 0;
|
|
|
|
r = bus_poll(bus, false, (uint64_t) -1);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
int sd_bus_add_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) {
|
|
struct filter_callback *f;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (!callback)
|
|
return -EINVAL;
|
|
|
|
f = new(struct filter_callback, 1);
|
|
if (!f)
|
|
return -ENOMEM;
|
|
f->callback = callback;
|
|
f->userdata = userdata;
|
|
|
|
LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f);
|
|
return 0;
|
|
}
|
|
|
|
int sd_bus_remove_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) {
|
|
struct filter_callback *f;
|
|
|
|
if (!bus)
|
|
return -EINVAL;
|
|
if (!callback)
|
|
return -EINVAL;
|
|
|
|
LIST_FOREACH(callbacks, f, bus->filter_callbacks) {
|
|
if (f->callback == callback && f->userdata == userdata) {
|
|
LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f);
|
|
free(f);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|