4afd3348c7
GLIB has recently started to officially support the gcc cleanup attribute in its public API, hence let's do the same for our APIs. With this patch we'll define an xyz_unrefp() call for each public xyz_unref() call, to make it easy to use inside a __attribute__((cleanup())) expression. Then, all code is ported over to make use of this. The new calls are also documented in the man pages, with examples how to use them (well, I only added docs where the _unref() call itself already had docs, and the examples, only cover sd_bus_unrefp() and sd_event_unrefp()). This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we tend to call our destructors these days. Note that this defines no public macro that wraps gcc's attribute and makes it easier to use. While I think it's our duty in the library to make our stuff easy to use, I figure it's not our duty to make gcc's own features easy to use on its own. Most likely, client code which wants to make use of this should define its own: #define _cleanup_(function) __attribute__((cleanup(function))) Or similar, to make the gcc feature easier to use. Making this logic public has the benefit that we can remove three header files whose only purpose was to define these functions internally. See #2008.
117 lines
3.6 KiB
C
117 lines
3.6 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 (C) 2014 Tom Gundersen <teg@jklm.no>
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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 <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/veth.h>
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#include <net/if.h>
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#include "sd-event.h"
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#include "sd-ipv4acd.h"
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#include "sd-netlink.h"
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#include "in-addr-util.h"
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#include "netlink-util.h"
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#include "util.h"
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static void acd_handler(sd_ipv4acd *acd, int event, void *userdata) {
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assert_se(acd);
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switch (event) {
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case SD_IPV4ACD_EVENT_BIND:
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log_info("bound");
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break;
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case SD_IPV4ACD_EVENT_CONFLICT:
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log_info("conflict");
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break;
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case SD_IPV4ACD_EVENT_STOP:
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log_error("the client was stopped");
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break;
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default:
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assert_not_reached("invalid ACD event");
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}
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}
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static int client_run(int ifindex, const struct in_addr *pa, const struct ether_addr *ha, sd_event *e) {
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sd_ipv4acd *acd;
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assert_se(sd_ipv4acd_new(&acd) >= 0);
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assert_se(sd_ipv4acd_attach_event(acd, e, 0) >= 0);
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assert_se(sd_ipv4acd_set_index(acd, ifindex) >= 0);
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assert_se(sd_ipv4acd_set_mac(acd, ha) >= 0);
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assert_se(sd_ipv4acd_set_address(acd, pa) >= 0);
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assert_se(sd_ipv4acd_set_callback(acd, acd_handler, NULL) >= 0);
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log_info("starting IPv4ACD client");
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assert_se(sd_ipv4acd_start(acd) >= 0);
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assert_se(sd_event_loop(e) >= 0);
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assert_se(!sd_ipv4acd_unref(acd));
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return EXIT_SUCCESS;
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}
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static int test_acd(const char *ifname, const char *address) {
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_cleanup_(sd_event_unrefp) sd_event *e = NULL;
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_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *reply = NULL;
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union in_addr_union pa;
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struct ether_addr ha;
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int ifindex;
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assert_se(in_addr_from_string(AF_INET, address, &pa) >= 0);
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assert_se(sd_event_new(&e) >= 0);
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assert_se(sd_netlink_open(&rtnl) >= 0);
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assert_se(sd_netlink_attach_event(rtnl, e, 0) >= 0);
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assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, 0) >= 0);
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assert_se(sd_netlink_message_append_string(m, IFLA_IFNAME, ifname) >= 0);
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assert_se(sd_netlink_call(rtnl, m, 0, &reply) >= 0);
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assert_se(sd_rtnl_message_link_get_ifindex(reply, &ifindex) >= 0);
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assert_se(sd_netlink_message_read_ether_addr(reply, IFLA_ADDRESS, &ha) >= 0);
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client_run(ifindex, &pa.in, &ha, e);
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return EXIT_SUCCESS;
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}
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int main(int argc, char *argv[]) {
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log_set_max_level(LOG_DEBUG);
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log_parse_environment();
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log_open();
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if (argc == 3)
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return test_acd(argv[1], argv[2]);
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else {
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log_error("This program takes two arguments.\n"
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"\t %s <ifname> <IPv4 address>", program_invocation_short_name);
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return EXIT_FAILURE;
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}
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}
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