libvirt/docs/examples/info1.c
2007-03-06 22:59:03 +00:00

64 lines
1.5 KiB
C

/**
* section: Informations
* synopsis: Extract informations about Xen domain 0
* purpose: Demonstrate the basic use of the library to connect to the
* hypervisor and extract domain informations.
* usage: info1
* test: info1
* author: Daniel Veillard
* copy: see Copyright for the status of this software.
*/
#include <stdio.h>
#include <libvirt/libvirt.h>
/**
* getDomainInfo:
* @id: the id of the domain
*
* extract the domain 0 informations
*/
static void
getDomainInfo(int id) {
virConnectPtr conn = NULL; /* the hypervisor connection */
virDomainPtr dom = NULL; /* the domain being checked */
virDomainInfo info; /* the informations being fetched */
int ret;
/* NULL means connect to local Xen hypervisor */
conn = virConnectOpenReadOnly(NULL);
if (conn == NULL) {
fprintf(stderr, "Failed to connect to hypervisor\n");
goto error;
}
/* Find the domain of the given id */
dom = virDomainLookupByID(conn, id);
if (dom == NULL) {
fprintf(stderr, "Failed to find Domain %d\n", id);
goto error;
}
/* Get the informations */
ret = virDomainGetInfo(dom, &info);
if (ret < 0) {
fprintf(stderr, "Failed to get informations for Domain %d\n", id);
goto error;
}
printf("Domains %d: %d CPUs\n", id, info.nrVirtCpu);
error:
if (dom != NULL)
virDomainFree(dom);
if (conn != NULL)
virConnectClose(conn);
}
int main() {
getDomainInfo(0);
return(0);
}