mirror of
https://github.com/openvswitch/ovs
synced 2025-10-13 14:07:02 +00:00
480ce8abca
Until now, the collection of vlog modules supported by a given OVS program
was not specific to that program. That means that, for example, even
though ovs-dpctl does not have anything to do with jsonrpc, it still has
a vlog module for it. This is confusing, at best.
This commit fixes the problem on some systems, in particular on ones that
use GCC and the GNU linker. It uses the feature of the GNU linker
described in its manual as:
If an orphaned section's name is representable as a C identifier then
the linker will automatically see PROVIDE two symbols: __start_SECNAME
and __end_SECNAME, where SECNAME is the name of the section. These
indicate the start address and end address of the orphaned section
respectively.
Systems that don't support these features retain the earlier behavior.
This commit also fixes the annoyance that modifying lib/vlog-modules.def
causes all sources files that #include "vlog.h" to recompile.
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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* Copyright (c) 2009, 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <net/if.h>
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#include <poll.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <stddef.h>
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#include <linux/rtnetlink.h>
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#include "netlink.h"
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#include "ofpbuf.h"
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#include "poll-loop.h"
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#include "timeval.h"
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#include "util.h"
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#include "vlog.h"
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static const struct nl_policy rtnlgrp_link_policy[] = {
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[IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
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[IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
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};
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int
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main(int argc OVS_UNUSED, char *argv[])
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{
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struct nl_sock *sock;
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int error;
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set_program_name(argv[0]);
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vlog_set_levels(NULL, VLF_ANY_FACILITY, VLL_DBG);
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error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &sock);
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if (error) {
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ovs_fatal(error, "could not create rtnetlink socket");
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}
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for (;;) {
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struct ofpbuf *buf;
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error = nl_sock_recv(sock, &buf, false);
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if (error == EAGAIN) {
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/* Nothing to do. */
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} else if (error == ENOBUFS) {
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ovs_error(0, "network monitor socket overflowed");
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} else if (error) {
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ovs_fatal(error, "error on network monitor socket");
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} else {
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struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
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struct nlmsghdr *nlh;
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struct ifinfomsg *iim;
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nlh = ofpbuf_at(buf, 0, NLMSG_HDRLEN);
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iim = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *iim);
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if (!iim) {
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ovs_error(0, "received bad rtnl message (no ifinfomsg)");
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ofpbuf_delete(buf);
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continue;
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}
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if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
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rtnlgrp_link_policy,
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attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
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ovs_error(0, "received bad rtnl message (policy)");
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ofpbuf_delete(buf);
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continue;
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}
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printf("netdev %s changed (%s):\n",
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nl_attr_get_string(attrs[IFLA_IFNAME]),
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(nlh->nlmsg_type == RTM_NEWLINK ? "RTM_NEWLINK"
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: nlh->nlmsg_type == RTM_DELLINK ? "RTM_DELLINK"
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: nlh->nlmsg_type == RTM_GETLINK ? "RTM_GETLINK"
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: nlh->nlmsg_type == RTM_SETLINK ? "RTM_SETLINK"
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: "other"));
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if (attrs[IFLA_MASTER]) {
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uint32_t idx = nl_attr_get_u32(attrs[IFLA_MASTER]);
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char ifname[IFNAMSIZ];
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if (!if_indextoname(idx, ifname)) {
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strcpy(ifname, "unknown");
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}
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printf("\tmaster=%"PRIu32" (%s)\n", idx, ifname);
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}
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ofpbuf_delete(buf);
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}
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nl_sock_wait(sock, POLLIN);
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poll_block();
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}
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}
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