libvirt/examples/c/domain/info1.c

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/**
* section: Information
* synopsis: Extract information about Xen domain 0
* purpose: Demonstrate the basic use of the library to connect to the
* hypervisor and extract domain information.
* usage: info1
* test: info1
* copy: see Copyright for the status of this software.
*/
#include <stdio.h>
#include <libvirt/libvirt.h>
/**
* getDomainInfo:
* @name: the name of the domain
*
* extract the domain 0 information
*/
static void
getDomainInfo(const char *uri, const char *name)
{
virConnectPtr conn = NULL; /* the hypervisor connection */
virDomainPtr dom = NULL; /* the domain being checked */
virDomainInfo info; /* the information being fetched */
int ret;
conn = virConnectOpenReadOnly(uri);
if (conn == NULL) {
fprintf(stderr, "Failed to connect to hypervisor\n");
goto error;
}
/* Find the domain of the given name */
dom = virDomainLookupByName(conn, name);
if (dom == NULL) {
fprintf(stderr, "Failed to find Domain %s\n", name);
goto error;
}
/* Get the information */
ret = virDomainGetInfo(dom, &info);
if (ret < 0) {
fprintf(stderr, "Failed to get information for Domain %s\n", name);
goto error;
}
printf("Domain %s: %d CPUs\n", name, info.nrVirtCpu);
error:
if (dom != NULL)
virDomainFree(dom);
if (conn != NULL)
virConnectClose(conn);
}
int main(int argc, char **argv)
{
if (argc != 3) {
fprintf(stderr, "syntax: %s: URI NAME\n", argv[0]);
return 1;
}
getDomainInfo(argv[1], argv[2]);
return 0;
}