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https://github.com/openvswitch/ovs
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e6211adce4
A new function vlog_insert_module() is introduced to avoid using list_insert() from the vlog.h header. Signed-off-by: Thomas Graf <tgraf@noironetworks.com> Acked-by: Ben Pfaff <blp@nicira.com>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* Copyright (c) 2009, 2010, 2013 Nicira, Inc.
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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 "xenserver.h"
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#include <ctype.h>
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dynamic-string.h"
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#include "process.h"
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#include "util.h"
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#include "openvswitch/vlog.h"
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VLOG_DEFINE_THIS_MODULE(xenserver);
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/* If running on a XenServer, the XenServer host UUID as a 36-character string,
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* otherwise null. */
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static char *host_uuid;
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static void
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read_host_uuid(void)
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{
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static const char filename[] = "/etc/xensource-inventory";
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char line[128];
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FILE *file;
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file = fopen(filename, "r");
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if (!file) {
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if (errno == ENOENT) {
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VLOG_DBG("not running on a XenServer");
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} else {
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VLOG_INFO("%s: open: %s", filename, ovs_strerror(errno));
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}
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return;
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}
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while (fgets(line, sizeof line, file)) {
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static const char leader[] = "INSTALLATION_UUID='";
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const int leader_len = strlen(leader);
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const int uuid_len = 36;
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static const char trailer[] = "'\n";
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const int trailer_len = strlen(trailer);
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if (strlen(line) == leader_len + uuid_len + trailer_len
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&& !memcmp(line, leader, leader_len)
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&& !memcmp(line + leader_len + uuid_len, trailer, trailer_len)) {
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host_uuid = xmemdup0(line + leader_len, uuid_len);
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VLOG_INFO("running on XenServer, host-uuid %s", host_uuid);
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fclose(file);
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return;
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}
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}
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fclose(file);
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VLOG_ERR("%s: INSTALLATION_UUID not found", filename);
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}
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const char *
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xenserver_get_host_uuid(void)
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{
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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pthread_once(&once, read_host_uuid);
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return host_uuid;
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}
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