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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