Re: [libvirt] Error connecting to virConnectOpen("qemu:///system"); after 20 times
Thanks it worked.
Regards,
Pankaj Rawat
NECHCLST
-----Original Message-----
From: Daniel P. Berrange [mailto:berrange@redhat.com]
Sent: 22 January 2013 17:13
To: Pankaj Rawat
Cc: libvir-list(a)redhat.com
Subject: Re: [libvirt] Error connecting to virConnectOpen("qemu:///system");
after 20 times
On Tue, Jan 22, 2013 at 11:31:27AM +0000, Pankaj Rawat wrote:
Hi,
I am using libvirt api to create an app, I am facing a problem.
I can connect to connection object 20 number of times in programm
after that it gives connection object null.
By default libvirtd has a limit of 20 concurrent active connections/
Here is the sample code.
Normally code should run 1000 times but it only runs 20 times
Filename: list.cpp
#include<pthread.h>
#include<stdlib.h>
#include<stdio.h>
#include<malloc.h>
#include <iostream>
#include<string.h>
#include <libvirt/libvirt.h>
#include <libvirt/virterror.h>
static int count;
static void customErrorFunc(void *userdata, virErrorPtr err)
{
}
int main()
{
virConnectPtr conn;
for ( int i=0; i< 1000;i++)
{
conn = virConnectOpen("qemu:///system");
if (conn == NULL) {
fprintf(stderr, "Failed to open connection to qemu:///system\n");
printf("Failed to open connection to qemu:///system\n");
virConnectClose(conn);
return NULL;
}
printf("Hello %d\n",i);
virError err;
virSetErrorFunc(NULL, customErrorFunc);
int j;
int numDomains1,numDomains2,numDomains;
int *activeDomains;
numDomains1 = virConnectNumOfDomains(conn);
activeDomains = (int*)malloc(sizeof(int) * numDomains1);
numDomains1 = virConnectListDomains(conn, activeDomains, numDomains1);
for (int j = 0 ; j < numDomains1 ; j++)
{
virDomainPtr dom;
dom = virDomainLookupByID(conn,activeDomains[j]);
free(dom);
You should be using virDomainFree(dom), not 'free(dom)' The latter is leaking
memory & loosing the reference on virConnectPtr causing the connection to be left
open. Hence you are hitting the 20 conn limit.
}
free(activeDomains);
count--;
virConnectClose(conn);
}
}
Daniel
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