On 11/29/2011 09:14 PM, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
>
> +
> +
> +/**
> + * 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
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