examples/domain/info1.c

   1 /**
   2  * section: Informations
   3  * synopsis: Extract information about Xen domain 0
   4  * purpose: Demonstrate the basic use of the library to connect to the
   5  *          hypervisor and extract domain information.
   6  * usage: info1
   7  * test: info1
   8  * copy: see Copyright for the status of this software.
   9  */
  10
  11 #include <stdio.h>
  12 #include <libvirt/libvirt.h>
  13
  14 /**
  15  * getDomainInfo:
  16  * @name: the name of the domain
  17  *
  18  * extract the domain 0 information
  19  */
  20 static void
  21 getDomainInfo(const char *uri, const char *name)
  22 {
  23     virConnectPtr conn = NULL; /* the hypervisor connection */
  24     virDomainPtr dom = NULL;   /* the domain being checked */
  25     virDomainInfo info;        /* the information being fetched */
  26     int ret;
  27
  28     conn = virConnectOpenReadOnly(uri);
  29     if (conn == NULL) {
  30         fprintf(stderr, "Failed to connect to hypervisor\n");
  31         goto error;
  32     }
  33
  34     /* Find the domain of the given name */
  35     dom = virDomainLookupByName(conn, name);
  36     if (dom == NULL) {
  37         fprintf(stderr, "Failed to find Domain %s\n", name);
  38         goto error;
  39     }
  40
  41     /* Get the information */
  42     ret = virDomainGetInfo(dom, &info);
  43     if (ret < 0) {
  44         fprintf(stderr, "Failed to get information for Domain %s\n", name);
  45         goto error;
  46     }
  47
  48     printf("Domain %s: %d CPUs\n", name, info.nrVirtCpu);
  49
  50  error:
  51     if (dom != NULL)
  52         virDomainFree(dom);
  53     if (conn != NULL)
  54         virConnectClose(conn);
  55 }
  56
  57 int main(int argc, char **argv)
  58 {
  59     if (argc != 3) {
  60         fprintf(stderr, "syntax: %s: URI NAME\n", argv[0]);
  61         return 1;
  62     }
  63     getDomainInfo(argv[1], argv[2]);
  64
  65     return 0;
  66 }