On 11/29/2011 09:14 PM, Daniel P. Berrange wrote:
From: "Daniel P. Berrange" <berrange@redhat.com>
+ + +/** + * virNodeSuspendSupportsTarget: + * @target: The power management target to check whether it is supported + * by the host. Values could be: + * VIR_NODE_SUSPEND_TARGET_MEM + * VIR_NODE_SUSPEND_TARGET_DISK + * VIR_NODE_SUSPEND_TARGET_HYBRID + * @supported: set to true if supported, false otherwise + * + * Run the script 'pm-is-supported' (from the pm-utils package) + * to find out if @target is supported by the host. + * + * Returns 0 if the query was successful, -1 on failure. + */ +int +virNodeSuspendSupportsTarget(unsigned int target, bool *supported) +{
We can mark this function as static, since it is only ever called by virNodeSuspendGetTargetMask().
+ virCommandPtr cmd; + int status; + int ret = -1; + + *supported = false; + + switch (target) { + case VIR_NODE_SUSPEND_TARGET_MEM: + cmd = virCommandNewArgList("pm-is-supported", "--suspend", NULL); + break; + case VIR_NODE_SUSPEND_TARGET_DISK: + cmd = virCommandNewArgList("pm-is-supported", "--hibernate", NULL); + break; + case VIR_NODE_SUSPEND_TARGET_HYBRID: + cmd = virCommandNewArgList("pm-is-supported", "--suspend-hybrid", NULL); + break; + default: + return ret; + } + + if (virCommandRun(cmd, &status) < 0) + goto cleanup; + + /* + * Check return code of command == 0 for success + * (i.e., the PM capability is supported) + */ + *supported = (status == 0); + ret = 0; + +cleanup: + virCommandFree(cmd); + return ret; +} + +/** + * virNodeSuspendGetTargetMask: + * + * Get the Power Management Capabilities that the host system supports, + * such as Suspend-to-RAM (S3), Suspend-to-Disk (S4) and Hybrid-Suspend + * (a combination of S3 and S4). + * + * @bitmask: Pointer to the bitmask which will be set appropriately to + * indicate all the supported host power management targets. + * + * Returns 0 if the query was successful, -1 on failure. + */ +int +virNodeSuspendGetTargetMask(unsigned int *bitmask) +{ + int ret; + bool supported; + + *bitmask = 0; + + /* Check support for Suspend-to-RAM (S3) */ + ret = virNodeSuspendSupportsTarget(VIR_NODE_SUSPEND_TARGET_MEM, &supported); + if (ret < 0) + return -1; + if (supported) + *bitmask |= (1 << VIR_NODE_SUSPEND_TARGET_MEM); + + /* Check support for Suspend-to-Disk (S4) */ + ret = virNodeSuspendSupportsTarget(VIR_NODE_SUSPEND_TARGET_DISK, &supported); + if (ret < 0) + return -1; + if (supported) + *bitmask |= (1 << VIR_NODE_SUSPEND_TARGET_DISK); + + /* Check support for Hybrid-Suspend */ + ret = virNodeSuspendSupportsTarget(VIR_NODE_SUSPEND_TARGET_HYBRID, &supported); + if (ret < 0) + return -1; + if (supported) + *bitmask |= (1 << VIR_NODE_SUSPEND_TARGET_HYBRID); + + return 0; +} diff --git a/src/util/virnodesuspend.h b/src/util/virnodesuspend.h index 66e3214..1e23ce8 100644 --- a/src/util/virnodesuspend.h +++ b/src/util/virnodesuspend.h @@ -32,5 +32,7 @@ int nodeSuspendForDuration(virConnectPtr conn,
int virNodeSuspendInit(void);
+int virNodeSuspendSupportsTarget(unsigned int target, bool *supported); +int virNodeSuspendGetTargetMask(unsigned int *bitmask);
#endif /* __VIR_NODE_SUSPEND_H__ */
-- Regards, Srivatsa S. Bhat IBM Linux Technology Center