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* Makefile.am configure.in examples/hellolibvirt/Makefile.am examples/hellolibvirt/hellolibvirt.c: new trivial example program by David Allan Daniel
206 lines
4.6 KiB
C
206 lines
4.6 KiB
C
/* This file contains trivial example code to connect to the running
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* hypervisor and gather a few bits of information. */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <libvirt/libvirt.h>
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#include <libvirt/virterror.h>
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static void
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showError(virConnectPtr conn)
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{
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int ret;
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virErrorPtr err;
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err = malloc(sizeof(*err));
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if (NULL == err) {
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printf("Could not allocate memory for error data\n");
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goto out;
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}
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ret = virConnCopyLastError(conn, err);
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switch (ret) {
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case 0:
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printf("No error found\n");
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break;
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case -1:
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printf("Parameter error when attempting to get last error\n");
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break;
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default:
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printf("libvirt reported: \"%s\"\n", err->message);
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break;
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}
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virResetError(err);
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free(err);
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out:
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return;
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}
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static int
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showHypervisorInfo(virConnectPtr conn)
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{
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int ret = 0;
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unsigned long hvVer, major, minor, release;
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const char *hvType;
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/* virConnectGetType returns a pointer to a static string, so no
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* allocation or freeing is necessary; it is possible for the call
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* to fail if, for example, there is no connection to a
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* hypervisor, so check what it returns. */
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hvType = virConnectGetType(conn);
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if (NULL == hvType) {
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ret = 1;
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printf("Failed to get hypervisor type\n");
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showError(conn);
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goto out;
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}
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if (0 != virConnectGetVersion(conn, &hvVer)) {
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ret = 1;
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printf("Failed to get hypervisor version\n");
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showError(conn);
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goto out;
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}
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major = hvVer / 1000000;
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hvVer %= 1000000;
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minor = hvVer / 1000;
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release = hvVer % 1000;
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printf("Hypervisor: \"%s\" version: %lu.%lu.%lu\n",
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hvType,
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major,
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minor,
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release);
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out:
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return ret;
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}
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static int
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showDomains(virConnectPtr conn)
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{
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int ret = 0, i, numNames, numInactiveDomains, numActiveDomains;
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char **nameList = NULL;
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numActiveDomains = virConnectNumOfDomains(conn);
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if (-1 == numActiveDomains) {
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ret = 1;
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printf("Failed to get number of active domains\n");
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showError(conn);
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goto out;
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}
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numInactiveDomains = virConnectNumOfDefinedDomains(conn);
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if (-1 == numInactiveDomains) {
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ret = 1;
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printf("Failed to get number of inactive domains\n");
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showError(conn);
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goto out;
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}
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printf("There are %d active and %d inactive domains\n",
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numActiveDomains, numInactiveDomains);
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nameList = malloc(sizeof(*nameList) * numInactiveDomains);
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if (NULL == nameList) {
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ret = 1;
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printf("Could not allocate memory for list of inactive domains\n");
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goto out;
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}
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numNames = virConnectListDefinedDomains(conn,
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nameList,
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numInactiveDomains);
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if (-1 == numNames) {
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ret = 1;
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printf("Could not get list of defined domains from hypervisor\n");
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showError(conn);
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goto out;
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}
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if (numNames > 0) {
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printf("Inactive domains:\n");
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}
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for (i = 0 ; i < numNames ; i++) {
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printf(" %s\n", *(nameList + i));
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/* The API documentation doesn't say so, but the names
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* returned by virConnectListDefinedDomains are strdup'd and
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* must be freed here. */
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free(*(nameList + i));
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}
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out:
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free(nameList);
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return ret;
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}
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int
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main(int argc, char *argv[])
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{
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int ret = 0;
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virConnectPtr conn;
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char *uri;
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printf("Attempting to connect to hypervisor\n");
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uri = (argc > 0 ? argv[1] : NULL);
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/* virConnectOpenAuth is called here with all default parameters,
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* except, possibly, the URI of the hypervisor. */
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conn = virConnectOpenAuth(uri, virConnectAuthPtrDefault, 0);
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if (NULL == conn) {
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ret = 1;
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printf("No connection to hypervisor\n");
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showError(conn);
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goto out;
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}
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uri = virConnectGetURI(conn);
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if (NULL == uri) {
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ret = 1;
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printf("Failed to get URI for hypervisor connection\n");
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showError(conn);
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goto disconnect;
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}
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printf("Connected to hypervisor at \"%s\"\n", uri);
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free(uri);
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if (0 != showHypervisorInfo(conn)) {
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ret = 1;
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goto disconnect;
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}
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if (0 != showDomains(conn)) {
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ret = 1;
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goto disconnect;
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}
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disconnect:
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if (0 != virConnectClose(conn)) {
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printf("Failed to disconnect from hypervisor\n");
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showError(conn);
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ret = 1;
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} else {
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printf("Disconnected from hypervisor\n");
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}
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out:
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return ret;
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}
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