multicast address use in corosync

Question

#include <stdio.h> 
#include <string.h> 

int main() { 
  char str1[50]="TEST sun raised";
  char str2[4][90]={"sun","in"};
  char delim[] = " ";

  char *ptr=strtok(str1,delim);
  while (ptr!=NULL) {

    int i=0;
    for (i=0; i<4; i++) {
      if(strcmp(str2[i],ptr)) {
        printf("%s\n",ptr);
        break;
      }
      else {   
      }
    }

    ptr=strtok(NULL,delim);
  }

  return 0; 
} 

Below code should return Test and raised but it returns all strings

Solution

You don't have to use multicast on corosync.

You may use unicast to do your job. This can be done by using something like this in /etc/corosync/corosync.conf for a two-member cluster:

compatibility: whitetank
totem {
        version: 2
        secauth: off
        interface {
                member {
                        memberaddr: 10.23.55.201
                }
                member {
                        memberaddr: 10.23.55.202
                }
                ringnumber: 0
                bindnetaddr: 10.23.55.0
                mcastport: 5405
        }
        transport: udpu
}
service {
        # Load the Pacemaker Cluster Resource Manager
        ver:            0
        name:           pacemaker
        use_mgmtd:      yes
        use_logd:       yes
}
logging {
        fileline: off
        to_logfile: yes
        to_syslog: yes
        debug: off
        logfile: /var/log/cluster/corosync.log
        debug: off
        timestamp: on
        logger_subsys {
                subsys: AMF
                debug: off
        }
}

Comments

[Krishna Reddy CH]

Above Code is not working as expected

[chux - Reinstate Monica]

Note: strcmp(str2[i],ptr) is true (non-0) when strings differ. Krishna Reddy CH, is this what you want?

[Krishna Reddy CH]

yes differ string i want but it is not coming

[robbpriestley]

"Below code should return Test and raised but it returns all strings." I'm sorry but that statement doesn't make any sense.

[Weather Vane]

And the reason why the word "sun" appears to match, when !=0 means it wasn't found, is because one of the other strings does not match.

[chux - Reinstate Monica]

Consider what happens with strcmp(str2[2],ptr)

[Weather Vane]

Change if(strcmp(str2[i],ptr)) to if(strcmp(str2[i],ptr) == 0) after which your program outputs sun.

[phoenixstudio]

are you trying to find matches or if it does not exist ? , the reason why you can see sun when you use !=0 is because sun match wich sun but does not match with Test and raised => you will see it in the results

[Krishna Reddy CH]

i want the string which doesnt exist in str2 array