RE: popen() is executed many times in MODE_SET_ACTION:

I found the problem is "ping" command.My env is uclinux and the net-snmp is 5.0.9v.My code is as follow.While i run "snmpget -c public -v2c 192.168.0.148 1.3.6.1.4.1.9362.1.7.0",the snmpd will run several times handle_led7(),and the code fp=popen("ping -c 8www.google.com","r") is run serveral times too.It just run one time if natural.If i change fp=popen("ping -c 8www.google.com","r");  to fp=popen("ps -ef","r");or other command,the handle_led7() just run one time as usual .my code :   static oid      led7_oid[] = { 1, 3, 6, 1, 4, 1, 9362, 1, 7 };
  
    netsnmp_register_scalar(netsnmp_create_handler_registration
                            ("led7", handle_led7, led7_oid,
                             OID_LENGTH(led7_oid), HANDLER_CAN_RWRITE));
  
int
handle_led7(netsnmp_mib_handler *handler,
            netsnmp_handler_registration *reginfo,
            netsnmp_agent_request_info *reqinfo,
            netsnmp_request_info *requests)
{
    FILE *fp;
    MYDEBUG( printf("popen haha (%s  %d\n) ... ", __FILE__,__LINE__));
    switch (reqinfo->mode) {
    case MODE_GET:
     fp=popen("ping -c 8www.google.com","r");
     pclose(fp);
     snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
                                 (u_char *)led7
                                 /* XXX: a pointer to the scalar's data */
                                 ,strlen(led7)
                                 /*
                                  * XXX: the length of the data in bytes
                                  */ );
     break;    
    case MODE_SET_RESERVE1:
    …………………… Could you tell me how to solve the problem please?thanks.

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