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testcpgzc.c
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/*
* Copyright (c) 2006-2009 Red Hat Inc
*
* All rights reserved.
*
* Author: Christine Caulfield <ccaulfie@redhat.com>
*
* This software licensed under BSD license, the text of which follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the MontaVista Software, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <corosync/corotypes.h>
#include <corosync/cpg.h>
#define BUFFER_SIZE 8192
#define DEFAULT_GROUP_NAME "GROUP"
static int quit = 0;
static int show_ip = 0;
static void print_cpgname (const struct cpg_name *name)
{
int i;
for (i = 0; i < name->length; i++) {
printf ("%c", name->value[i]);
}
}
static void DeliverCallback (
cpg_handle_t handle,
const struct cpg_name *groupName,
uint32_t nodeid,
uint32_t pid,
void *msg,
size_t msg_len)
{
if (show_ip) {
struct in_addr saddr;
saddr.s_addr = nodeid;
printf("DeliverCallback: message (len=%lu)from node/pid %s/%d: '%s'\n",
(unsigned long int) msg_len,
inet_ntoa(saddr), pid, (const char *)msg);
}
else {
printf("DeliverCallback: message (len=%lu)from node/pid " CS_PRI_NODE_ID "/%d: '%s'\n",
(unsigned long int) msg_len, nodeid, pid,
(const char *)msg);
}
}
static void ConfchgCallback (
cpg_handle_t handle,
const struct cpg_name *groupName,
const struct cpg_address *member_list, size_t member_list_entries,
const struct cpg_address *left_list, size_t left_list_entries,
const struct cpg_address *joined_list, size_t joined_list_entries)
{
int i;
struct in_addr saddr;
printf("\nConfchgCallback: group '");
print_cpgname(groupName);
printf("'\n");
for (i=0; i<joined_list_entries; i++) {
if (show_ip) {
saddr.s_addr = joined_list[i].nodeid;
printf("joined node/pid: %s/%d reason: %d\n",
inet_ntoa (saddr), joined_list[i].pid,
joined_list[i].reason);
}
else {
printf("joined node/pid: " CS_PRI_NODE_ID "/%d reason: %d\n",
joined_list[i].nodeid, joined_list[i].pid,
joined_list[i].reason);
}
}
for (i=0; i<left_list_entries; i++) {
if (show_ip) {
saddr.s_addr = left_list[i].nodeid;
printf("left node/pid: %s/%d reason: %d\n",
inet_ntoa (saddr), left_list[i].pid,
left_list[i].reason);
}
else {
printf("left node/pid: " CS_PRI_NODE_ID "/%d reason: %d\n",
left_list[i].nodeid, left_list[i].pid,
left_list[i].reason);
}
}
printf("nodes in group now %lu\n",
(unsigned long int) member_list_entries);
for (i=0; i<member_list_entries; i++) {
if (show_ip) {
saddr.s_addr = member_list[i].nodeid;
printf("node/pid: %s/%d\n",
inet_ntoa (saddr), member_list[i].pid);
}
else {
printf("node/pid: " CS_PRI_NODE_ID "/%d\n",
member_list[i].nodeid, member_list[i].pid);
}
}
/* Is it us??
NOTE: in reality we should also check the nodeid */
if (left_list_entries && left_list[0].pid == getpid()) {
printf("We have left the building\n");
quit = 1;
}
}
static cpg_callbacks_t callbacks = {
.cpg_deliver_fn = DeliverCallback,
.cpg_confchg_fn = ConfchgCallback,
};
static struct cpg_name group_name;
int main (int argc, char *argv[]) {
cpg_handle_t handle;
fd_set read_fds;
int select_fd;
int result;
const char *options = "i";
int opt;
unsigned int nodeid;
char *fgets_res;
void *buffer;
while ( (opt = getopt(argc, argv, options)) != -1 ) {
switch (opt) {
case 'i':
show_ip = 1;
break;
}
}
if (argc > optind) {
if (strlen(argv[optind]) >= CPG_MAX_NAME_LENGTH) {
fprintf(stderr, "Invalid name for cpg group\n");
return (1);
}
strcpy(group_name.value, argv[optind]);
group_name.length = strlen(argv[optind])+1;
}
else {
strcpy(group_name.value, DEFAULT_GROUP_NAME);
group_name.length = strlen(DEFAULT_GROUP_NAME) + 1;
}
result = cpg_initialize (&handle, &callbacks);
if (result != CS_OK) {
printf ("Could not initialize Cluster Process Group API instance error %d\n", result);
exit (1);
}
cpg_zcb_alloc (handle, BUFFER_SIZE, &buffer);
cpg_zcb_free (handle, buffer);
cpg_zcb_alloc (handle, BUFFER_SIZE, &buffer);
result = cpg_local_get (handle, &nodeid);
if (result != CS_OK) {
printf ("Could not get local node id\n");
exit (1);
}
printf ("Local node id is " CS_PRI_NODE_ID "\n", nodeid);
result = cpg_join(handle, &group_name);
if (result != CS_OK) {
printf ("Could not join process group, error %d\n", result);
exit (1);
}
FD_ZERO (&read_fds);
cpg_fd_get(handle, &select_fd);
printf ("Type EXIT to finish\n");
do {
FD_SET (select_fd, &read_fds);
FD_SET (STDIN_FILENO, &read_fds);
result = select (select_fd + 1, &read_fds, 0, 0, 0);
if (result == -1) {
perror ("select\n");
}
if (FD_ISSET (STDIN_FILENO, &read_fds)) {
fgets_res = fgets(buffer, BUFFER_SIZE, stdin);
if (fgets_res == NULL) {
cpg_leave(handle, &group_name);
}
if (strncmp(buffer, "EXIT", 4) == 0) {
cpg_leave(handle, &group_name);
}
else {
cpg_zcb_mcast_joined (handle, CPG_TYPE_AGREED,
buffer, strlen (buffer) + 1);
}
}
if (FD_ISSET (select_fd, &read_fds)) {
if (cpg_dispatch (handle, CS_DISPATCH_ALL) != CS_OK)
exit(1);
}
} while (result && !quit);
result = cpg_finalize (handle);
printf ("Finalize result is %d (should be 1)\n", result);
return (0);
}

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