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135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/**
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* section: Scheduling
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* synopsis: Suspend a domain and then resume its execution
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* purpose: Demonstrate the basic use of the library to suspend and
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* resume a domain. If no id is given on the command line
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* this script will suspend and resume the first domain found
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* which is not Domain 0.
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* usage: suspend [id]
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* test: suspend
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* author: Daniel Veillard
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* copy: see Copyright for the status of this software.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <libvirt/libvirt.h>
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static virConnectPtr conn = NULL; /* the hypervisor connection */
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/**
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* checkDomainState:
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* @dom: the domain
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*
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* Return the current state of a domain or -1 if non-exsitant
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*/
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static int
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checkDomainState(virDomainPtr dom) {
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virDomainInfo info; /* the information being fetched */
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int ret;
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ret = virDomainGetInfo(dom, &info);
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if (ret < 0) {
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return(-1);
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}
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return(info.state);
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}
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/**
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* SuspendAndResumeDomain:
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* @id: the id of the domain
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*
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* extract the domain 0 information
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*/
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static void
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SuspendAndResumeDomain(int id) {
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virDomainPtr dom = NULL; /* the domain being checked */
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int ret, state;
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/* Find the domain of the given id */
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dom = virDomainLookupByID(conn, id);
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if (dom == NULL) {
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fprintf(stderr, "Failed to find Domain %d\n", id);
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goto error;
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}
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/* Check state */
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state = checkDomainState(dom);
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if ((state == VIR_DOMAIN_RUNNING) ||
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(state == VIR_DOMAIN_NOSTATE) ||
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(state == VIR_DOMAIN_BLOCKED)) {
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printf("Suspending domain...\n");
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ret = virDomainSuspend(dom);
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if (ret < 0) {
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fprintf(stderr, "Failed to suspend Domain %d\n", id);
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goto error;
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}
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state = checkDomainState(dom);
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if (state != VIR_DOMAIN_PAUSED) {
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fprintf(stderr, "Domain %d state is not suspended\n", id);
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} else {
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printf("Domain suspended, resuming it...\n");
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}
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ret = virDomainResume(dom);
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if (ret < 0) {
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fprintf(stderr, "Failed to resume Domain %d\n", id);
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goto error;
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}
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state = checkDomainState(dom);
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if ((state == VIR_DOMAIN_RUNNING) ||
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(state == VIR_DOMAIN_NOSTATE) ||
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(state == VIR_DOMAIN_BLOCKED)) {
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printf("Domain resumed\n");
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} else {
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fprintf(stderr, "Domain %d state indicate it is not resumed\n", id);
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}
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} else {
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fprintf(stderr, "Domain %d is not in a state where it should be suspended\n", id);
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goto error;
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}
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error:
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if (dom != NULL)
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virDomainFree(dom);
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}
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int main(int argc, char **argv) {
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int id = 0;
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/* NULL means connect to local Xen hypervisor */
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conn = virConnectOpenReadOnly(NULL);
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if (conn == NULL) {
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fprintf(stderr, "Failed to connect to hypervisor\n");
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goto error;
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}
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if (argc > 1) {
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id = atoi(argv[1]);
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}
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if (id == 0) {
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int i, j, ids[10];
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i = virConnectListDomains(conn, &ids[0], 10);
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if (i < 0) {
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fprintf(stderr, "Failed to list the domains\n");
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goto error;
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}
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for (j = 0;j < i;j++) {
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if (ids[j] != 0) {
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id = ids[j];
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break;
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}
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}
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}
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if (id == 0) {
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fprintf(stderr, "Failed find a running guest domain\n");
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goto error;
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}
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SuspendAndResumeDomain(id);
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error:
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if (conn != NULL)
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virConnectClose(conn);
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return(0);
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}
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