libvirt/src/xs_internal.c
2008-11-17 11:44:51 +00:00

923 lines
24 KiB
C

/*
* xs_internal.c: access to Xen Store
*
* Copyright (C) 2006 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
* Daniel Veillard <veillard@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <xen/dom0_ops.h>
#include <xen/version.h>
#include <xen/xen.h>
#include <xs.h>
#include "virterror_internal.h"
#include "datatypes.h"
#include "driver.h"
#include "xen_unified.h"
#include "xs_internal.h"
#include "xen_internal.h" /* for xenHypervisorCheckID */
#ifdef __linux__
#define XEN_HYPERVISOR_SOCKET "/proc/xen/privcmd"
#elif defined(__sun__)
#define XEN_HYPERVISOR_SOCKET "/dev/xen/privcmd"
#else
#error "unsupported platform"
#endif
#ifndef PROXY
static char *xenStoreDomainGetOSType(virDomainPtr domain);
struct xenUnifiedDriver xenStoreDriver = {
xenStoreOpen, /* open */
xenStoreClose, /* close */
NULL, /* version */
NULL, /* hostname */
NULL, /* URI */
NULL, /* nodeGetInfo */
NULL, /* getCapabilities */
xenStoreListDomains, /* listDomains */
NULL, /* numOfDomains */
NULL, /* domainCreateXML */
NULL, /* domainSuspend */
NULL, /* domainResume */
xenStoreDomainShutdown, /* domainShutdown */
xenStoreDomainReboot, /* domainReboot */
NULL, /* domainDestroy */
xenStoreDomainGetOSType, /* domainGetOSType */
xenStoreDomainGetMaxMemory, /* domainGetMaxMemory */
NULL, /* domainSetMaxMemory */
xenStoreDomainSetMemory, /* domainSetMemory */
xenStoreGetDomainInfo, /* domainGetInfo */
NULL, /* domainSave */
NULL, /* domainRestore */
NULL, /* domainCoreDump */
NULL, /* domainSetVcpus */
NULL, /* domainPinVcpu */
NULL, /* domainGetVcpus */
NULL, /* domainGetMaxVcpus */
NULL, /* listDefinedDomains */
NULL, /* numOfDefinedDomains */
NULL, /* domainCreate */
NULL, /* domainDefineXML */
NULL, /* domainUndefine */
NULL, /* domainAttachDevice */
NULL, /* domainDetachDevice */
NULL, /* domainGetAutostart */
NULL, /* domainSetAutostart */
NULL, /* domainGetSchedulerType */
NULL, /* domainGetSchedulerParameters */
NULL, /* domainSetSchedulerParameters */
};
#endif /* ! PROXY */
#define virXenStoreError(conn, code, fmt...) \
virReportErrorHelper(NULL, VIR_FROM_XENSTORE, code, __FILE__, \
__FUNCTION__, __LINE__, fmt)
/************************************************************************
* *
* Helper internal APIs *
* *
************************************************************************/
#ifndef PROXY
/**
* virConnectDoStoreList:
* @conn: pointer to the hypervisor connection
* @path: the absolute path of the directory in the store to list
* @nb: OUT pointer to the number of items found
*
* Internal API querying the Xenstore for a list
*
* Returns a string which must be freed by the caller or NULL in case of error
*/
static char **
virConnectDoStoreList(virConnectPtr conn, const char *path,
unsigned int *nb)
{
xenUnifiedPrivatePtr priv;
if (conn == NULL)
return NULL;
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL || path == NULL || nb == NULL)
return (NULL);
return xs_directory (priv->xshandle, 0, path, nb);
}
#endif /* ! PROXY */
/**
* virDomainDoStoreQuery:
* @conn: pointer to the hypervisor connection
* @domid: id of the domain
* @path: the relative path of the data in the store to retrieve
*
* Internal API querying the Xenstore for a string value.
*
* Returns a string which must be freed by the caller or NULL in case of error
*/
static char *
virDomainDoStoreQuery(virConnectPtr conn, int domid, const char *path)
{
char s[256];
unsigned int len = 0;
xenUnifiedPrivatePtr priv;
if (!conn)
return NULL;
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
snprintf(s, 255, "/local/domain/%d/%s", domid, path);
s[255] = 0;
return xs_read(priv->xshandle, 0, &s[0], &len);
}
#ifndef PROXY
/**
* virDomainDoStoreWrite:
* @domain: a domain object
* @path: the relative path of the data in the store to retrieve
*
* Internal API setting up a string value in the Xenstore
* Requires write access to the XenStore
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainDoStoreWrite(virDomainPtr domain, const char *path,
const char *value)
{
char s[256];
xenUnifiedPrivatePtr priv;
int ret = -1;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (-1);
priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
if (priv->xshandle == NULL)
return (-1);
if (domain->conn->flags & VIR_CONNECT_RO)
return (-1);
snprintf(s, 255, "/local/domain/%d/%s", domain->id, path);
s[255] = 0;
if (xs_write(priv->xshandle, 0, &s[0], value, strlen(value)))
ret = 0;
return (ret);
}
/**
* virDomainGetVM:
* @domain: a domain object
*
* Internal API extracting a xenstore vm path.
*
* Returns the new string or NULL in case of error
*/
static char *
virDomainGetVM(virDomainPtr domain)
{
char *vm;
char query[200];
unsigned int len;
xenUnifiedPrivatePtr priv;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (NULL);
priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
snprintf(query, 199, "/local/domain/%d/vm", virDomainGetID(domain));
query[199] = 0;
vm = xs_read(priv->xshandle, 0, &query[0], &len);
return (vm);
}
/**
* virDomainGetVMInfo:
* @domain: a domain object
* @vm: the xenstore vm path
* @name: the value's path
*
* Internal API extracting one information the device used
* by the domain from xensttore
*
* Returns the new string or NULL in case of error
*/
static char *
virDomainGetVMInfo(virDomainPtr domain, const char *vm, const char *name)
{
char s[256];
char *ret = NULL;
unsigned int len = 0;
xenUnifiedPrivatePtr priv;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (NULL);
priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
snprintf(s, 255, "%s/%s", vm, name);
s[255] = 0;
ret = xs_read(priv->xshandle, 0, &s[0], &len);
return (ret);
}
#endif /* ! PROXY */
/************************************************************************
* *
* Canonical internal APIs *
* *
************************************************************************/
/**
* xenStoreOpen:
* @conn: pointer to the connection block
* @name: URL for the target, NULL for local
* @flags: combination of virDrvOpenFlag(s)
*
* Connects to the Xen hypervisor.
*
* Returns 0 or -1 in case of error.
*/
int
xenStoreOpen(virConnectPtr conn,
virConnectAuthPtr auth ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED)
{
xenUnifiedPrivatePtr priv = (xenUnifiedPrivatePtr) conn->privateData;
#ifdef PROXY
priv->xshandle = xs_daemon_open_readonly();
#else
if (flags & VIR_CONNECT_RO)
priv->xshandle = xs_daemon_open_readonly();
else
priv->xshandle = xs_daemon_open();
#endif /* ! PROXY */
if (priv->xshandle == NULL) {
/*
* not being able to connect via the socket as a normal user
* is rather normal, this should fallback to the proxy (or
* remote) mechanism.
*/
if (getuid() == 0) {
virXenStoreError(NULL, VIR_ERR_NO_XEN,
"%s", _("failed to connect to Xen Store"));
}
return (-1);
}
return (0);
}
/**
* xenStoreClose:
* @conn: pointer to the connection block
*
* Close the connection to the Xen hypervisor.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
xenStoreClose(virConnectPtr conn)
{
xenUnifiedPrivatePtr priv;
if (conn == NULL) {
virXenStoreError(conn, VIR_ERR_INVALID_ARG, __FUNCTION__);
return(-1);
}
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return(-1);
xs_daemon_close(priv->xshandle);
return (0);
}
#ifndef PROXY
/**
* xenStoreGetDomainInfo:
* @domain: pointer to the domain block
* @info: the place where information should be stored
*
* Do an hypervisor call to get the related set of domain information.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreGetDomainInfo(virDomainPtr domain, virDomainInfoPtr info)
{
char *tmp, **tmp2;
unsigned int nb_vcpus;
char request[200];
xenUnifiedPrivatePtr priv;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (-1);
if ((domain == NULL) || (domain->conn == NULL) || (info == NULL)) {
virXenStoreError(domain ? domain->conn : NULL, VIR_ERR_INVALID_ARG,
__FUNCTION__);
return(-1);
}
priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
if (priv->xshandle == NULL)
return(-1);
if (domain->id == -1)
return(-1);
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "running");
if (tmp != NULL) {
if (tmp[0] == '1')
info->state = VIR_DOMAIN_RUNNING;
free(tmp);
} else {
info->state = VIR_DOMAIN_NOSTATE;
}
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "memory/target");
if (tmp != NULL) {
info->memory = atol(tmp);
info->maxMem = atol(tmp);
free(tmp);
} else {
info->memory = 0;
info->maxMem = 0;
}
#if 0
/* doesn't seems to work */
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "cpu_time");
if (tmp != NULL) {
info->cpuTime = atol(tmp);
free(tmp);
} else {
info->cpuTime = 0;
}
#endif
snprintf(request, 199, "/local/domain/%d/cpu", domain->id);
request[199] = 0;
tmp2 = virConnectDoStoreList(domain->conn, request, &nb_vcpus);
if (tmp2 != NULL) {
info->nrVirtCpu = nb_vcpus;
free(tmp2);
}
return (0);
}
/**
* xenStoreDomainSetMemory:
* @domain: pointer to the domain block
* @memory: the max memory size in kilobytes.
*
* Change the maximum amount of memory allowed in the xen store
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainSetMemory(virDomainPtr domain, unsigned long memory)
{
int ret;
char value[20];
if ((domain == NULL) || (domain->conn == NULL) ||
(memory < 1024 * MIN_XEN_GUEST_SIZE)) {
virXenStoreError(domain ? domain->conn : NULL, VIR_ERR_INVALID_ARG,
__FUNCTION__);
return(-1);
}
if (domain->id == -1)
return(-1);
if ((domain->id == 0) && (memory < (2 * MIN_XEN_GUEST_SIZE * 1024)))
return(-1);
snprintf(value, 19, "%lu", memory);
value[19] = 0;
ret = virDomainDoStoreWrite(domain, "memory/target", &value[0]);
if (ret < 0)
return (-1);
return (0);
}
/**
* xenStoreDomainGetMaxMemory:
* @domain: pointer to the domain block
*
* Ask the xenstore for the maximum memory allowed for a domain
*
* Returns the memory size in kilobytes or 0 in case of error.
*/
unsigned long
xenStoreDomainGetMaxMemory(virDomainPtr domain)
{
char *tmp;
unsigned long ret = 0;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (ret);
if (domain->id == -1)
return(-1);
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "memory/target");
if (tmp != NULL) {
ret = (unsigned long) atol(tmp);
free(tmp);
}
return(ret);
}
/**
* xenStoreNumOfDomains:
* @conn: pointer to the hypervisor connection
*
* Provides the number of active domains.
*
* Returns the number of domain found or -1 in case of error
*/
int
xenStoreNumOfDomains(virConnectPtr conn)
{
unsigned int num;
char **idlist;
int ret = -1;
xenUnifiedPrivatePtr priv;
if (conn == NULL) {
virXenStoreError(conn, VIR_ERR_INVALID_ARG, __FUNCTION__);
return -1;
}
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL) {
virXenStoreError(conn, VIR_ERR_INVALID_ARG, __FUNCTION__);
return(-1);
}
idlist = xs_directory(priv->xshandle, 0, "/local/domain", &num);
if (idlist) {
free(idlist);
ret = num;
}
return(ret);
}
/**
* xenStoreListDomains:
* @conn: pointer to the hypervisor connection
* @ids: array to collect the list of IDs of active domains
* @maxids: size of @ids
*
* Collect the list of active domains, and store their ID in @maxids
*
* Returns the number of domain found or -1 in case of error
*/
int
xenStoreListDomains(virConnectPtr conn, int *ids, int maxids)
{
char **idlist = NULL, *endptr;
unsigned int num, i;
int ret;
long id;
xenUnifiedPrivatePtr priv;
if ((conn == NULL) || (ids == NULL)) {
virXenStoreError(conn, VIR_ERR_INVALID_ARG, __FUNCTION__);
return(-1);
}
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return(-1);
idlist = xs_directory (priv->xshandle, 0, "/local/domain", &num);
if (idlist == NULL)
return(-1);
for (ret = 0, i = 0; (i < num) && (ret < maxids); i++) {
id = strtol(idlist[i], &endptr, 10);
if ((endptr == idlist[i]) || (*endptr != 0)) {
ret = -1;
break;
}
#if 0
if (virConnectCheckStoreID(conn, (int) id) < 0)
continue;
#endif
ids[ret++] = (int) id;
}
free(idlist);
return(ret);
}
/**
* xenStoreLookupByName:
* @conn: A xend instance
* @name: The name of the domain
*
* Try to lookup a domain on the Xen Store based on its name.
*
* Returns a new domain object or NULL in case of failure
*/
virDomainPtr
xenStoreLookupByName(virConnectPtr conn, const char *name)
{
virDomainPtr ret = NULL;
unsigned int num, i, len;
long id = -1;
char **idlist = NULL, *endptr;
char prop[200], *tmp;
int found = 0;
struct xend_domain *xenddomain = NULL;
xenUnifiedPrivatePtr priv;
if ((conn == NULL) || (name == NULL)) {
virXenStoreError(conn, VIR_ERR_INVALID_ARG, __FUNCTION__);
return(NULL);
}
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return(NULL);
idlist = xs_directory(priv->xshandle, 0, "/local/domain", &num);
if (idlist == NULL)
goto done;
for (i = 0; i < num; i++) {
id = strtol(idlist[i], &endptr, 10);
if ((endptr == idlist[i]) || (*endptr != 0)) {
goto done;
}
#if 0
if (virConnectCheckStoreID(conn, (int) id) < 0)
continue;
#endif
snprintf(prop, 199, "/local/domain/%s/name", idlist[i]);
prop[199] = 0;
tmp = xs_read(priv->xshandle, 0, prop, &len);
if (tmp != NULL) {
found = STREQ (name, tmp);
free(tmp);
if (found)
break;
}
}
if (!found)
goto done;
ret = virGetDomain(conn, name, NULL);
if (ret == NULL)
goto done;
ret->id = id;
done:
free(xenddomain);
free(idlist);
return(ret);
}
/**
* xenStoreDomainShutdown:
* @domain: pointer to the Domain block
*
* Shutdown the domain, the OS is requested to properly shutdown
* and the domain may ignore it. It will return immediately
* after queuing the request.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainShutdown(virDomainPtr domain)
{
if ((domain == NULL) || (domain->conn == NULL)) {
virXenStoreError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
return(-1);
}
if (domain->id == -1 || domain->id == 0)
return(-1);
/*
* this is very hackish, the domU kernel probes for a special
* node in the xenstore and launch the shutdown command if found.
*/
return(virDomainDoStoreWrite(domain, "control/shutdown", "poweroff"));
}
/**
* xenStoreDomainReboot:
* @domain: pointer to the Domain block
* @flags: extra flags for the reboot operation, not used yet
*
* Reboot the domain, the OS is requested to properly shutdown
* and reboot but the domain may ignore it. It will return immediately
* after queuing the request.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainReboot(virDomainPtr domain, unsigned int flags ATTRIBUTE_UNUSED)
{
if ((domain == NULL) || (domain->conn == NULL)) {
virXenStoreError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
return(-1);
}
if (domain->id == -1 || domain->id == 0)
return(-1);
/*
* this is very hackish, the domU kernel probes for a special
* node in the xenstore and launch the shutdown command if found.
*/
return(virDomainDoStoreWrite(domain, "control/shutdown", "reboot"));
}
/*
* xenStoreDomainGetOSType:
* @domain: a domain object
*
* Get the type of domain operation system.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
static char *
xenStoreDomainGetOSType(virDomainPtr domain) {
char *vm, *str = NULL;
if ((domain == NULL) || (domain->conn == NULL)) {
virXenStoreError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
return(NULL);
}
vm = virDomainGetVM(domain);
if (vm) {
str = virDomainGetVMInfo(domain, vm, "image/ostype");
free(vm);
}
return (str);
}
#endif /* ! PROXY */
/**
* xenStoreDomainGetVNCPort:
* @conn: the hypervisor connection
* @domid: id of the domain
*
* Return the port number on which the domain is listening for VNC
* connections.
*
* Returns the port number, -1 in case of error
*/
int xenStoreDomainGetVNCPort(virConnectPtr conn, int domid) {
char *tmp;
int ret = -1;
tmp = virDomainDoStoreQuery(conn, domid, "console/vnc-port");
if (tmp != NULL) {
char *end;
ret = strtol(tmp, &end, 10);
if (ret == 0 && end == tmp)
ret = -1;
free(tmp);
}
return(ret);
}
/**
* xenStoreDomainGetConsolePath:
* @conn: the hypervisor connection
* @domid: id of the domain
*
* Return the path to the psuedo TTY on which the guest domain's
* serial console is attached.
*
* Returns the path to the serial console. It is the callers
* responsibilty to free() the return string. Returns NULL
* on error
*/
char * xenStoreDomainGetConsolePath(virConnectPtr conn, int domid) {
return virDomainDoStoreQuery(conn, domid, "console/tty");
}
#ifdef PROXY
/*
* xenStoreDomainGetOSTypeID:
* @conn: pointer to the connection.
* @id: the domain id
*
* Get the type of domain operation system.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetOSTypeID(virConnectPtr conn, int id) {
char *vm, *str = NULL;
char query[200];
unsigned int len;
xenUnifiedPrivatePtr priv;
if (id < 0)
return(NULL);
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
snprintf(query, 199, "/local/domain/%d/vm", id);
query[199] = 0;
vm = xs_read(priv->xshandle, 0, &query[0], &len);
if (vm) {
snprintf(query, 199, "%s/image/ostype", vm);
str = xs_read(priv->xshandle, 0, &query[0], &len);
free(vm);
}
if (str == NULL)
str = strdup("linux");
return (str);
}
#endif /* PROXY */
/*
* xenStoreDomainGetNetworkID:
* @conn: pointer to the connection.
* @id: the domain id
* @mac: the mac address
*
* Get the reference (i.e. the string number) for the device on that domain
* which uses the given mac address
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetNetworkID(virConnectPtr conn, int id, const char *mac) {
char dir[80], path[128], **list = NULL, *val = NULL;
unsigned int maclen, len, i, num;
char *ret = NULL;
xenUnifiedPrivatePtr priv;
if (id < 0)
return(NULL);
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
if (mac == NULL)
return (NULL);
maclen = strlen(mac);
if (maclen <= 0)
return (NULL);
snprintf(dir, sizeof(dir), "/local/domain/0/backend/vif/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list == NULL)
return(NULL);
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "mac");
val = xs_read(priv->xshandle, 0, path, &len);
if (val == NULL)
break;
if ((maclen != len) || memcmp(val, mac, len)) {
free(val);
} else {
ret = strdup(list[i]);
free(val);
break;
}
}
free(list);
return(ret);
}
/*
* xenStoreDomainGetDiskID:
* @conn: pointer to the connection.
* @id: the domain id
* @dev: the virtual block device name
*
* Get the reference (i.e. the string number) for the device on that domain
* which uses the given virtual block device name
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetDiskID(virConnectPtr conn, int id, const char *dev) {
char dir[80], path[128], **list = NULL, *val = NULL;
unsigned int devlen, len, i, num;
char *ret = NULL;
xenUnifiedPrivatePtr priv;
if (id < 0)
return(NULL);
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return (NULL);
if (dev == NULL)
return (NULL);
devlen = strlen(dev);
if (devlen <= 0)
return (NULL);
snprintf(dir, sizeof(dir), "/local/domain/0/backend/vbd/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list != NULL) {
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "dev");
val = xs_read(priv->xshandle, 0, path, &len);
if (val == NULL)
break;
if ((devlen != len) || memcmp(val, dev, len)) {
free (val);
} else {
ret = strdup(list[i]);
free (val);
free (list);
return (ret);
}
}
free (list);
}
snprintf(dir, sizeof(dir), "/local/domain/0/backend/tap/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list != NULL) {
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "dev");
val = xs_read(priv->xshandle, 0, path, &len);
if (val == NULL)
break;
if ((devlen != len) || memcmp(val, dev, len)) {
free (val);
} else {
ret = strdup(list[i]);
free (val);
free (list);
return (ret);
}
}
free (list);
}
return (NULL);
}
char *xenStoreDomainGetName(virConnectPtr conn,
int id) {
char prop[200];
xenUnifiedPrivatePtr priv;
unsigned int len;
priv = (xenUnifiedPrivatePtr) conn->privateData;
if (priv->xshandle == NULL)
return(NULL);
snprintf(prop, 199, "/local/domain/%d/name", id);
prop[199] = 0;
return xs_read(priv->xshandle, 0, prop, &len);
}