C++ NULLSTR函数代码示例

static int
_yapi_desc(const cint_parameter_desc_t *desc, int level)
{
    int dim_index;
    _yapi_indent(level);
    CINT_PRINTF("basetype: %s\n", NULLSTR(desc->basetype));
    _yapi_indent(level);
    CINT_PRINTF("pcount: %d\n", desc->pcount);
    _yapi_indent(level);
    CINT_PRINTF("name: %s\n", NULLSTR(desc->name));
    _yapi_indent(level);
    CINT_PRINTF(
        "arrayDimensions: %d\n", 
        desc->utype.declaration.arrayDimensions);
    for(dim_index = 0; 
        dim_index < desc->utype.declaration.arrayDimensions;
        ++dim_index) {
        _yapi_indent(level);
        CINT_PRINTF(
            "dimensions[%d]: %d\n",
            dim_index,
            desc->dimensions[dim_index]);
    }
    _yapi_indent(level);
    CINT_PRINTF("flags: %d\n", desc->flags);

    return 0;
}

void do_chsave( CHAR_DATA *ch, char *argument )
{
    char arg1[MAX_INPUT_LENGTH];
    char arg2[MAX_INPUT_LENGTH];
    char buf[MSL];

    argument = one_argument( argument, arg1 );
    argument = one_argument( argument, arg2 );

    if ( IS_NPC(ch) )
        return;

    if (!ch->desc || NULLSTR(arg1) )
    {
        send_to_char("Syntax: chsave load/save\n\r",ch);
        send_to_char("Syntax: chsave delete (change number)\n\r",ch);
        return;
    }

    if ( !str_cmp(arg1,"load") )
    {
        load_changes( );
        send_to_char("Changes Loaded.\n\r",ch);
        return;
    }

    if ( !str_cmp(arg1,"save") )
    {
        save_changes( );
        send_to_char("Changes Saved.\n\r",ch);
        return;
    }

    if ( !str_cmp(arg1, "delete"))
    {
        int num;

        if ( NULLSTR(arg2) || !is_number( arg2 ) )
        {
            send_to_char("For chsave delete, you must provide a change number.\n\r",ch);
            send_to_char("Syntax: chsave delete (change number)\n\r",ch);
            return;
        }

        num = atoi( arg2 );
        if ( num < 0 || num > maxChanges )
        {
            sprintf( buf, "Valid changes are from 0 to %d.\n\r", maxChanges );
            send_to_char( buf, ch );
            return;
        }
        delete_change( num );
        send_to_char("Change deleted.\n\r",ch);
        return;
    }

    return;
}

/**
 * qemuAgentSend:
 * @mon: Monitor
 * @msg: Message
 * @seconds: number of seconds to wait for the result, it can be either
 *           -2, -1, 0 or positive.
 *
 * Send @msg to agent @mon. If @seconds is equal to
 * VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK(-2), this function will block forever
 * waiting for the result. The value of
 * VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT(-1) means use default timeout value
 * and VIR_DOMAIN_QEMU_AGENT_COMMAND_NOWAIT(0) makes this this function return
 * immediately without waiting. Any positive value means the number of seconds
 * to wait for the result.
 *
 * Returns: 0 on success,
 *          -2 on timeout,
 *          -1 otherwise
 */
static int qemuAgentSend(qemuAgentPtr mon,
                         qemuAgentMessagePtr msg,
                         int seconds)
{
    int ret = -1;
    unsigned long long then = 0;

    /* Check whether qemu quit unexpectedly */
    if (mon->lastError.code != VIR_ERR_OK) {
        VIR_DEBUG("Attempt to send command while error is set %s",
                  NULLSTR(mon->lastError.message));
        virSetError(&mon->lastError);
        return -1;
    }

    if (seconds > VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK) {
        unsigned long long now;
        if (virTimeMillisNow(&now) < 0)
            return -1;
        if (seconds == VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT)
            seconds = QEMU_AGENT_WAIT_TIME;
        then = now + seconds * 1000ull;
    }

    mon->msg = msg;
    qemuAgentUpdateWatch(mon);

    while (!mon->msg->finished) {
        if ((then && virCondWaitUntil(&mon->notify, &mon->parent.lock, then) < 0) ||
            (!then && virCondWait(&mon->notify, &mon->parent.lock) < 0)) {
            if (errno == ETIMEDOUT) {
                virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
                               _("Guest agent not available for now"));
                ret = -2;
            } else {
                virReportSystemError(errno, "%s",
                                     _("Unable to wait on agent monitor "
                                       "condition"));
            }
            goto cleanup;
        }
    }

    if (mon->lastError.code != VIR_ERR_OK) {
        VIR_DEBUG("Send command resulted in error %s",
                  NULLSTR(mon->lastError.message));
        virSetError(&mon->lastError);
        goto cleanup;
    }

    ret = 0;

 cleanup:
    mon->msg = NULL;
    qemuAgentUpdateWatch(mon);

    return ret;
}

/**
 * virNetDevVethCreate:
 * @veth1: pointer to name for parent end of veth pair
 * @veth2: pointer to return name for container end of veth pair
 *
 * Creates a veth device pair using the ip command:
 * ip link add veth1 type veth peer name veth2
 * If veth1 points to NULL on entry, it will be a valid interface on
 * return.  veth2 should point to NULL on entry.
 *
 * NOTE: If veth1 and veth2 names are not specified, ip will auto assign
 *       names.  There seems to be two problems here -
 *       1) There doesn't seem to be a way to determine the names of the
 *          devices that it creates.  They show up in ip link show and
 *          under /sys/class/net/ however there is no guarantee that they
 *          are the devices that this process just created.
 *       2) Once one of the veth devices is moved to another namespace, it
 *          is no longer visible in the parent namespace.  This seems to
 *          confuse the name assignment causing it to fail with File exists.
 *       Because of these issues, this function currently allocates names
 *       prior to using the ip command, and returns any allocated names
 *       to the caller.
 *
 * Returns 0 on success or -1 in case of error
 */
int virNetDevVethCreate(char** veth1, char** veth2)
{
    int rc = -1;
    const char *argv[] = {
        "ip", "link", "add", NULL, "type", "veth", "peer", "name", NULL, NULL
    };
    int vethDev = 0;
    bool veth1_alloc = false;
    bool veth2_alloc = false;

    VIR_DEBUG("Host: %s guest: %s", NULLSTR(*veth1), NULLSTR(*veth2));

    if (*veth1 == NULL) {
        if ((vethDev = virNetDevVethGetFreeName(veth1, vethDev)) < 0)
            goto cleanup;
        VIR_DEBUG("Assigned host: %s", *veth1);
        veth1_alloc = true;
        vethDev++;
    }
    argv[3] = *veth1;

    while (*veth2 == NULL) {
        if ((vethDev = virNetDevVethGetFreeName(veth2, vethDev)) < 0) {
            if (veth1_alloc)
                VIR_FREE(*veth1);
            goto cleanup;
        }

        /* Just make sure they didn't accidentally get same name */
        if (STREQ(*veth1, *veth2)) {
            vethDev++;
            VIR_FREE(*veth2);
            continue;
        }

        VIR_DEBUG("Assigned guest: %s", *veth2);
        veth2_alloc = true;
    }
    argv[8] = *veth2;

    VIR_DEBUG("Create Host: %s guest: %s", *veth1, *veth2);
    if (virRun(argv, NULL) < 0) {
        if (veth1_alloc)
            VIR_FREE(*veth1);
        if (veth2_alloc)
            VIR_FREE(*veth2);
        goto cleanup;
    }

    rc = 0;

cleanup:
    return rc;
}

/**
 * qemuAgentSend:
 * @mon: Monitor
 * @msg: Message
 * @timeout: use timeout?
 *
 * Send @msg to agent @mon.
 * Wait max QEMU_AGENT_WAIT_TIME for agent
 * to reply.
 *
 * Returns: 0 on success,
 *          -2 on timeout,
 *          -1 otherwise
 */
static int qemuAgentSend(qemuAgentPtr mon,
                         qemuAgentMessagePtr msg,
                         bool timeout)
{
    int ret = -1;
    unsigned long long now, then = 0;

    /* Check whether qemu quit unexpectedly */
    if (mon->lastError.code != VIR_ERR_OK) {
        VIR_DEBUG("Attempt to send command while error is set %s",
                  NULLSTR(mon->lastError.message));
        virSetError(&mon->lastError);
        return -1;
    }

    if (timeout) {
        if (virTimeMillisNow(&now) < 0)
            return -1;
        then = now + QEMU_AGENT_WAIT_TIME;
    }

    mon->msg = msg;
    qemuAgentUpdateWatch(mon);

    while (!mon->msg->finished) {
        if ((timeout && virCondWaitUntil(&mon->notify, &mon->lock, then) < 0) ||
            (!timeout && virCondWait(&mon->notify, &mon->lock) < 0)) {
            if (errno == ETIMEDOUT) {
                qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("Guest agent not available for now"));
                ret = -2;
            } else {
                qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("Unable to wait on monitor condition"));
            }
            goto cleanup;
        }
    }

    if (mon->lastError.code != VIR_ERR_OK) {
        VIR_DEBUG("Send command resulted in error %s",
                  NULLSTR(mon->lastError.message));
        virSetError(&mon->lastError);
        goto cleanup;
    }

    ret = 0;

cleanup:
    mon->msg = NULL;
    qemuAgentUpdateWatch(mon);

    return ret;
}

int
hyperyVerifyResponse(WsManClient *client, WsXmlDocH response,
                     const char *detail)
{
    int lastError = wsmc_get_last_error(client);
    int responseCode = wsmc_get_response_code(client);
    WsManFault *fault;

    if (lastError != WS_LASTERR_OK) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Transport error during %s: %s (%d)"),
                       detail, wsman_transport_get_last_error_string(lastError),
                       lastError);
        return -1;
    }

    /* Check the HTTP response code and report an error if it's not 200 (OK),
     * 400 (Bad Request) or 500 (Internal Server Error) */
    if (responseCode != 200 && responseCode != 400 && responseCode != 500) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Unexpected HTTP response during %s: %d"),
                       detail, responseCode);
        return -1;
    }

    if (response == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Empty response during %s"), detail);
        return -1;
    }

    if (wsmc_check_for_fault(response)) {
        fault = wsmc_fault_new();

        if (fault == NULL) {
            virReportOOMError();
            return -1;
        }

        wsmc_get_fault_data(response, fault);

        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("SOAP fault during %s: code '%s', subcode '%s', "
                         "reason '%s', detail '%s'"),
                       detail, NULLSTR(fault->code), NULLSTR(fault->subcode),
                       NULLSTR(fault->reason), NULLSTR(fault->fault_detail));

        wsmc_fault_destroy(fault);
        return -1;
    }

    return 0;
}

/**
 * virCPUUpdate:
 *
 * @arch: CPU architecture
 * @guest: guest CPU definition to be updated
 * @host: host CPU definition
 *
 * Updates @guest CPU definition according to @host CPU. This is required to
 * support guest CPU definitions specified relatively to host CPU, such as
 * CPUs with VIR_CPU_MODE_CUSTOM and optional features or
 * VIR_CPU_MATCH_MINIMUM, or CPUs with VIR_CPU_MODE_HOST_MODEL.
 * When the guest CPU was not specified relatively, the function does nothing
 * and returns success.
 *
 * Returns 0 on success, -1 on error.
 */
int
virCPUUpdate(virArch arch,
             virCPUDefPtr guest,
             const virCPUDef *host)
{
    struct cpuArchDriver *driver;

    VIR_DEBUG("arch=%s, guest=%p mode=%s model=%s, host=%p model=%s",
              virArchToString(arch), guest, virCPUModeTypeToString(guest->mode),
              NULLSTR(guest->model), host, NULLSTR(host ? host->model : NULL));

    if (!(driver = cpuGetSubDriver(arch)))
        return -1;

    if (guest->mode == VIR_CPU_MODE_HOST_PASSTHROUGH)
        return 0;

    if (guest->mode == VIR_CPU_MODE_CUSTOM &&
        guest->match != VIR_CPU_MATCH_MINIMUM) {
        size_t i;
        bool optional = false;

        for (i = 0; i < guest->nfeatures; i++) {
            if (guest->features[i].policy == VIR_CPU_FEATURE_OPTIONAL) {
                optional = true;
                break;
            }
        }

        if (!optional)
            return 0;
    }

    /* We get here if guest CPU is either
     *  - host-model
     *  - custom with minimum match
     *  - custom with optional features
     */
    if (!driver->update) {
        virReportError(VIR_ERR_NO_SUPPORT,
                       _("cannot update guest CPU for %s architecture"),
                       virArchToString(arch));
        return -1;
    }

    if (driver->update(guest, host) < 0)
        return -1;

    VIR_DEBUG("model=%s", NULLSTR(guest->model));
    return 0;
}

virCPUCompareResult
cpuCompareXML(virCPUDefPtr host,
              const char *xml)
{
    xmlDocPtr doc = NULL;
    xmlXPathContextPtr ctxt = NULL;
    virCPUDefPtr cpu = NULL;
    virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;

    VIR_DEBUG("host=%p, xml=%s", host, NULLSTR(xml));

    if (!(doc = virXMLParseStringCtxt(xml, _("(CPU_definition)"), &ctxt)))
        goto cleanup;

    cpu = virCPUDefParseXML(ctxt->node, ctxt, VIR_CPU_TYPE_AUTO);
    if (cpu == NULL)
        goto cleanup;

    if (!cpu->model) {
        virCPUReportError(VIR_ERR_OPERATION_INVALID,
                "%s", _("no CPU model specified"));
        goto cleanup;
    }

    ret = cpuCompare(host, cpu);

cleanup:
    virCPUDefFree(cpu);
    xmlXPathFreeContext(ctxt);
    xmlFreeDoc(doc);

    return ret;
}

int
qemuTeardownImageCgroup(virDomainObjPtr vm,
                        virStorageSourcePtr src)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;
    int perms = VIR_CGROUP_DEVICE_READ |
                VIR_CGROUP_DEVICE_WRITE |
                VIR_CGROUP_DEVICE_MKNOD;
    int ret;

    if (!virCgroupHasController(priv->cgroup,
                                VIR_CGROUP_CONTROLLER_DEVICES))
        return 0;

    if (!src->path || !virStorageSourceIsLocalStorage(src)) {
        VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
                  NULLSTR(src->path), virStorageTypeToString(src->type));
        return 0;
    }

    VIR_DEBUG("Deny path %s", src->path);

    ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms, true);

    virDomainAuditCgroupPath(vm, priv->cgroup, "deny", src->path,
                             virCgroupGetDevicePermsString(perms), ret == 0);

    return ret;
}

/**
 * virCPUCompareXML:
 *
 * @arch: CPU architecture
 * @host: host CPU definition
 * @xml: XML description of either guest or host CPU to be compared with @host
 * @failIncompatible: return an error instead of VIR_CPU_COMPARE_INCOMPATIBLE
 *
 * Compares the CPU described by @xml with @host CPU.
 *
 * Returns VIR_CPU_COMPARE_ERROR on error, VIR_CPU_COMPARE_INCOMPATIBLE when
 * the two CPUs are incompatible, VIR_CPU_COMPARE_IDENTICAL when the two CPUs
 * are identical, VIR_CPU_COMPARE_SUPERSET when the @xml CPU is a superset of
 * the @host CPU. If @failIncompatible is true, the function will return
 * VIR_CPU_COMPARE_ERROR (and set VIR_ERR_CPU_INCOMPATIBLE error) when the
 * two CPUs are incompatible.
 */
virCPUCompareResult
virCPUCompareXML(virArch arch,
                 virCPUDefPtr host,
                 const char *xml,
                 bool failIncompatible)
{
    xmlDocPtr doc = NULL;
    xmlXPathContextPtr ctxt = NULL;
    virCPUDefPtr cpu = NULL;
    virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;

    VIR_DEBUG("arch=%s, host=%p, xml=%s",
              virArchToString(arch), host, NULLSTR(xml));

    if (!xml) {
        virReportError(VIR_ERR_INVALID_ARG, "%s", _("missing CPU definition"));
        goto cleanup;
    }

    if (!(doc = virXMLParseStringCtxt(xml, _("(CPU_definition)"), &ctxt)))
        goto cleanup;

    if (virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_AUTO, &cpu) < 0)
        goto cleanup;

    ret = virCPUCompare(arch, host, cpu, failIncompatible);

 cleanup:
    virCPUDefFree(cpu);
    xmlXPathFreeContext(ctxt);
    xmlFreeDoc(doc);

    return ret;
}

static int
testQemuDiskXMLToPropsValidateSchema(const void *opaque)
{
    struct testQemuDiskXMLToJSONData *data = (void *) opaque;
    virBuffer debug = VIR_BUFFER_INITIALIZER;
    char *propsstr = NULL;
    char *debugmsg = NULL;
    int ret = 0;
    size_t i;

    if (data->fail)
        return EXIT_AM_SKIP;

    for (i = 0; i < data->nprops; i++) {
        if (testQEMUSchemaValidate(data->props[i], data->schemaroot,
                                   data->schema, &debug) < 0) {
            debugmsg = virBufferContentAndReset(&debug);
            propsstr = virJSONValueToString(data->props[i], true);
            VIR_TEST_VERBOSE("json does not conform to QAPI schema");
            VIR_TEST_DEBUG("json:\n%s\ndoes not match schema. Debug output:\n %s",
                           propsstr, NULLSTR(debugmsg));
            VIR_FREE(debugmsg);
            VIR_FREE(propsstr);
            ret = -1;
        }

        virBufferFreeAndReset(&debug);
    }
    return ret;
}

void do_delchange( CHAR_DATA * ch, char *argument )
{
    char arg1[MAX_INPUT_LENGTH];
    char buf[MSL];
    int num;

    argument = one_argument( argument, arg1 );

    if( IS_NPC( ch ) )
        return;

    if( !ch->desc || NULLSTR( arg1 ) || !is_number( arg1 ) )
    {
        send_to_char( "#wFor delchange you must provide a change number.#D\n\r", ch );
        send_to_char( "Syntax: delchange (change number)\n\r", ch );
        return;
    }

    num = atoi( arg1 );
    if( num < 0 || num > maxChanges )
    {
        xprintf( buf, "Valid changes are from 0 to %d.\n\r", maxChanges );
        send_to_char( buf, ch );
        return;
    }
    delete_change( num );
    send_to_char( "Change deleted.\n\r", ch );
    return;
}

/**
 * virNetworkDefineXML:
 * @conn: pointer to the hypervisor connection
 * @xml: the XML description for the network, preferably in UTF-8
 *
 * Define an inactive persistent virtual network or modify an existing
 * persistent one from the XML description.
 *
 * virNetworkFree should be used to free the resources after the
 * network object is no longer needed.
 *
 * Returns NULL in case of error, a pointer to the network otherwise
 */
virNetworkPtr
virNetworkDefineXML(virConnectPtr conn, const char *xml)
{
    VIR_DEBUG("conn=%p, xml=%s", conn, NULLSTR(xml));

    virResetLastError();

    virCheckConnectReturn(conn, NULL);
    virCheckReadOnlyGoto(conn->flags, error);
    virCheckNonNullArgGoto(xml, error);

    if (conn->networkDriver && conn->networkDriver->networkDefineXML) {
        virNetworkPtr ret;
        ret = conn->networkDriver->networkDefineXML(conn, xml);
        if (!ret)
            goto error;
        return ret;
    }

    virReportUnsupportedError();

 error:
    virDispatchError(conn);
    return NULL;
}

/**
 * virNetworkGetDHCPLeases:
 * @network: Pointer to network object
 * @mac: Optional ASCII formatted MAC address of an interface
 * @leases: Pointer to a variable to store the array containing details on
 *          obtained leases, or NULL if the list is not required (just returns
 *          number of leases).
 * @flags: Extra flags, not used yet, so callers should always pass 0
 *
 * For DHCPv4, the information returned:
 * - Network Interface Name
 * - Expiry Time
 * - MAC address
 * - IAID (NULL)
 * - IPv4 address (with type and prefix)
 * - Hostname (can be NULL)
 * - Client ID (can be NULL)
 *
 * For DHCPv6, the information returned:
 * - Network Interface Name
 * - Expiry Time
 * - MAC address
 * - IAID (can be NULL, only in rare cases)
 * - IPv6 address (with type and prefix)
 * - Hostname (can be NULL)
 * - Client DUID
 *
 * Note: @mac, @iaid, @ipaddr, @clientid are in ASCII form, not raw bytes.
 * Note: @expirytime can 0, in case the lease is for infinite time.
 *
 * The API fetches leases info of guests in the specified network. If the
 * optional parameter @mac is specified, the returned list will contain only
 * lease info about a specific guest interface with @mac. There can be
 * multiple leases for a single @mac because this API supports DHCPv6 too.
 *
 * Returns the number of leases found or -1 and sets @leases to NULL in
 * case of error. On success, the array stored into @leases is guaranteed to
 * have an extra allocated element set to NULL but not included in the return
 * count, to make iteration easier. The caller is responsible for calling
 * virNetworkDHCPLeaseFree() on each array element, then calling free() on @leases.
 *
 * See also virNetworkGetDHCPLeasesForMAC() as a convenience for filtering
 * the list to a single MAC address.
 *
 * Example of usage:
 *
 * virNetworkDHCPLeasePtr *leases = NULL;
 * virNetworkPtr network = ... obtain a network pointer here ...;
 * size_t i;
 * int nleases;
 * unsigned int flags = 0;
 *
 * nleases = virNetworkGetDHCPLeases(network, NULL, &leases, flags);
 * if (nleases < 0)
 *     error();
 *
 * ... do something with returned values, for example:
 *
 * for (i = 0; i < nleases; i++) {
 *     virNetworkDHCPLeasePtr lease = leases[i];
 *
 *     printf("Time(epoch): %lu, MAC address: %s, "
 *            "IP address: %s, Hostname: %s, ClientID: %s\n",
 *            lease->expirytime, lease->mac, lease->ipaddr,
 *            lease->hostname, lease->clientid);
 *
 *            virNetworkDHCPLeaseFree(leases[i]);
 * }
 *
 * free(leases);
 *
 */
int
virNetworkGetDHCPLeases(virNetworkPtr network,
                        const char *mac,
                        virNetworkDHCPLeasePtr **leases,
                        unsigned int flags)
{
    virConnectPtr conn;
    VIR_DEBUG("network=%p, mac='%s' leases=%p, flags=0x%x",
               network, NULLSTR(mac), leases, flags);

    virResetLastError();

    if (leases)
        *leases = NULL;

    virCheckNetworkReturn(network, -1);

    conn = network->conn;

    if (conn->networkDriver && conn->networkDriver->networkGetDHCPLeases) {
        int ret;
        ret = conn->networkDriver->networkGetDHCPLeases(network, mac, leases, flags);
        if (ret < 0)
            goto error;
        return ret;
    }

    virReportUnsupportedError();
//.........这里部分代码省略.........

/**
 * virNWFilterBindingCreateXML:
 * @conn: pointer to the hypervisor connection
 * @xml: an XML description of the binding
 * @flags: currently unused, pass 0
 *
 * Define a new network filter, based on an XML description
 * similar to the one returned by virNWFilterGetXMLDesc(). This
 * API may be used to associate a filter with a currently running
 * guest that does not have a filter defined for a specific network
 * port. Since the bindings are generally automatically managed by
 * the hypervisor, using this command to define a filter for a network
 * port and then starting the guest afterwards may prevent the guest
 * from starting if it attempts to use the network port and finds a
 * filter already defined.
 *
 * virNWFilterFree should be used to free the resources after the
 * binding object is no longer needed.
 *
 * Returns a new binding object or NULL in case of failure
 */
virNWFilterBindingPtr
virNWFilterBindingCreateXML(virConnectPtr conn, const char *xml, unsigned int flags)
{
    VIR_DEBUG("conn=%p, xml=%s", conn, NULLSTR(xml));

    virResetLastError();

    virCheckConnectReturn(conn, NULL);
    virCheckNonNullArgGoto(xml, error);
    virCheckReadOnlyGoto(conn->flags, error);

    if (conn->nwfilterDriver && conn->nwfilterDriver->nwfilterBindingCreateXML) {
        virNWFilterBindingPtr ret;
        ret = conn->nwfilterDriver->nwfilterBindingCreateXML(conn, xml, flags);
        if (!ret)
            goto error;
        return ret;
    }

    virReportUnsupportedError();

 error:
    virDispatchError(conn);
    return NULL;
}