C++ VIR_WARN函数代码示例

virCapsPtr
virBhyveCapsBuild(void)
{
    virCapsPtr caps;
    virCapsGuestPtr guest;

    if ((caps = virCapabilitiesNew(virArchFromHost(),
                                   false, false)) == NULL)
        return NULL;

    if ((guest = virCapabilitiesAddGuest(caps, VIR_DOMAIN_OSTYPE_HVM,
                                         VIR_ARCH_X86_64,
                                         "bhyve",
                                         NULL, 0, NULL)) == NULL)
        goto error;

    if (virCapabilitiesAddGuestDomain(guest, VIR_DOMAIN_VIRT_BHYVE,
                                      NULL, NULL, 0, NULL) == NULL)
        goto error;

    if (virBhyveCapsInitCPU(caps, virArchFromHost()) < 0)
        VIR_WARN("Failed to get host CPU: %s", virGetLastErrorMessage());

    return caps;

 error:
    virObjectUnref(caps);
    return NULL;
}

static int xenParseCmdline(virConfPtr conf, char **r_cmdline)
{
    char *cmdline = NULL;
    const char *root, *extra, *buf;

    if (xenConfigGetString(conf, "cmdline", &buf, NULL) < 0)
        return -1;

    if (xenConfigGetString(conf, "root", &root, NULL) < 0)
        return -1;

    if (xenConfigGetString(conf, "extra", &extra, NULL) < 0)
        return -1;

    if (buf) {
        if (VIR_STRDUP(cmdline, buf) < 0)
            return -1;
        if (root || extra)
            VIR_WARN("ignoring root= and extra= in favour of cmdline=");
    } else {
        if (root && extra) {
            if (virAsprintf(&cmdline, "root=%s %s", root, extra) < 0)
                return -1;
        } else if (root) {
            if (virAsprintf(&cmdline, "root=%s", root) < 0)
                return -1;
        } else if (extra) {
            if (VIR_STRDUP(cmdline, extra) < 0)
                return -1;
        }
    }

    *r_cmdline = cmdline;
    return 0;
}

void virEventPollUpdateTimeout(int timer, int frequency)
{
    unsigned long long now;
    int i;
    PROBE(EVENT_POLL_UPDATE_TIMEOUT,
          "timer=%d frequency=%d",
          timer, frequency);

    if (timer <= 0) {
        VIR_WARN("Ignoring invalid update timer %d", timer);
        return;
    }

    if (virTimeMillisNow(&now) < 0) {
        return;
    }

    virMutexLock(&eventLoop.lock);
    for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
        if (eventLoop.timeouts[i].timer == timer) {
            eventLoop.timeouts[i].frequency = frequency;
            eventLoop.timeouts[i].expiresAt =
                frequency >= 0 ? frequency + now : 0;
            virEventPollInterruptLocked();
            break;
        }
    }
    virMutexUnlock(&eventLoop.lock);
}

/*
 * Unregister a callback for a timer
 * NB, it *must* be safe to call this from within a callback
 * For this reason we only ever set a flag in the existing list.
 * Actual deletion will be done out-of-band
 */
int virEventPollRemoveTimeout(int timer)
{
    size_t i;
    PROBE(EVENT_POLL_REMOVE_TIMEOUT,
          "timer=%d",
          timer);

    if (timer <= 0) {
        VIR_WARN("Ignoring invalid remove timer %d", timer);
        return -1;
    }

    virMutexLock(&eventLoop.lock);
    for (i = 0; i < eventLoop.timeoutsCount; i++) {
        if (eventLoop.timeouts[i].deleted)
            continue;

        if (eventLoop.timeouts[i].timer == timer) {
            eventLoop.timeouts[i].deleted = 1;
            virEventPollInterruptLocked();
            virMutexUnlock(&eventLoop.lock);
            return 0;
        }
    }
    virMutexUnlock(&eventLoop.lock);
    return -1;
}

/**
 * virStorageBackendZFSVolModeNeeded:
 *
 * Checks if it's necessary to specify 'volmode' (i.e. that
 * we're working with BSD ZFS implementation).
 *
 * Returns 1 if 'volmode' is need, 0 if not needed, -1 on error
 */
static int
virStorageBackendZFSVolModeNeeded(void)
{
    virCommandPtr cmd = NULL;
    int ret = -1, exit_code = -1;
    char *error = NULL;

    /* 'zfs get' without arguments prints out
     * usage information to stderr, including
     * list of supported options, and exits with
     * exit code 2
     */
    cmd = virCommandNewArgList(ZFS, "get", NULL);
    virCommandAddEnvString(cmd, "LC_ALL=C");
    virCommandSetErrorBuffer(cmd, &error);

    ret = virCommandRun(cmd, &exit_code);
    if ((ret < 0) || (exit_code != 2)) {
        VIR_WARN("Command 'zfs get' either failed "
                 "to run or exited with unexpected status");
        goto cleanup;
    }

    if (strstr(error, " volmode "))
        ret = 1;
    else
        ret = 0;

 cleanup:
    virCommandFree(cmd);
    VIR_FREE(error);
    return ret;
}

static int
qemuAgentIOProcessEvent(qemuAgentPtr mon,
                        virJSONValuePtr obj)
{
    const char *type;
    VIR_DEBUG("mon=%p obj=%p", mon, obj);

    type = virJSONValueObjectGetString(obj, "event");
    if (!type) {
        VIR_WARN("missing event type in message");
        errno = EINVAL;
        return -1;
    }

/*
    for (i = 0; i < ARRAY_CARDINALITY(eventHandlers); i++) {
        if (STREQ(eventHandlers[i].type, type)) {
            virJSONValuePtr data = virJSONValueObjectGet(obj, "data");
            VIR_DEBUG("handle %s handler=%p data=%p", type,
                      eventHandlers[i].handler, data);
            (eventHandlers[i].handler)(mon, data);
            break;
        }
    }
*/
    return 0;
}

/**
 * virArchFromHost:
 *
 * Return the host architecture. Prefer this to the
 * uname 'machine' field, since this will canonicalize
 * architecture names like 'amd64' into 'x86_64'.
 */
virArch virArchFromHost(void)
{
    struct utsname ut;
    virArch arch;

    uname(&ut);

    /* Some special cases we need to handle first
     * for non-canonical names */
    if (strlen(ut.machine) == 4 &&
        ut.machine[0] == 'i' &&
        ut.machine[2] == '8' &&
        ut.machine[3] == '6' &&
        ut.machine[4] == '\0') {
        arch = VIR_ARCH_I686;
    } else if (STREQ(ut.machine, "amd64")) {
        arch = VIR_ARCH_X86_64;
    } else {
        /* Otherwise assume the canonical name */
        if ((arch = virArchFromString(ut.machine)) == VIR_ARCH_NONE) {
            VIR_WARN("Unknown host arch %s, report to [email protected]",
                     ut.machine);
        }
    }

    VIR_DEBUG("Mapped %s to %d (%s)",
              ut.machine, arch, virArchToString(arch));

    return arch;
}

virSecurityManagerPtr
virSecurityManagerNew(const char *name,
                      const char *virtDriver,
                      unsigned int flags)
{
    virSecurityDriverPtr drv = virSecurityDriverLookup(name, virtDriver);
    if (!drv)
        return NULL;

    /* driver "none" needs some special handling of *Confined bools */
    if (STREQ(drv->name, "none")) {
        if (flags & VIR_SECURITY_MANAGER_REQUIRE_CONFINED) {
            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                           _("Security driver \"none\" cannot create confined guests"));
            return NULL;
        }

        if (flags & VIR_SECURITY_MANAGER_DEFAULT_CONFINED) {
            if (name != NULL) {
                VIR_WARN("Configured security driver \"none\" disables default"
                         " policy to create confined guests");
            } else {
                VIR_DEBUG("Auto-probed security driver is \"none\";"
                          " confined guests will not be created");
            }
            flags &= ~VIR_SECURITY_MANAGER_DEFAULT_CONFINED;
        }
    }

    return virSecurityManagerNewDriver(drv,
                                       virtDriver,
                                       flags);
}

/**
 * virRandomBits:
 * @nbits: Number of bits of randommess required
 *
 * Generate an evenly distributed random number between [0,2^nbits), where
 * @nbits must be in the range (0,64].
 *
 * Return: a random number with @nbits entropy
 */
uint64_t virRandomBits(int nbits)
{
    uint64_t ret = 0;
    int32_t bits;

    if (virRandomInitialize() < 0) {
        /* You're already hosed, so this particular non-random value
         * isn't any worse.  */
        VIR_WARN("random number generation is broken");
        return 0;
    }

    virMutexLock(&randomLock);

    while (nbits > RANDOM_BITS_PER_ITER) {
        random_r(&randomData, &bits);
        ret = (ret << RANDOM_BITS_PER_ITER) | (bits & RANDOM_BITS_MASK);
        nbits -= RANDOM_BITS_PER_ITER;
    }

    random_r(&randomData, &bits);
    ret = (ret << nbits) | (bits & ((1 << nbits) - 1));

    virMutexUnlock(&randomLock);
    return ret;
}

void
qemuSecurityRestoreAllLabel(virQEMUDriverPtr driver,
                            virDomainObjPtr vm,
                            bool migrated)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;
    bool transactionStarted = false;

    /* In contrast to qemuSecuritySetAllLabel, do not use vm->pid
     * here. This function is called from qemuProcessStop() which
     * is meant to do cleanup after qemu process died. The
     * domain's namespace is gone as qemu was the only process
     * running there. We would not succeed in entering the
     * namespace then. */
    if (virSecurityManagerTransactionStart(driver->securityManager) >= 0)
        transactionStarted = true;

    virSecurityManagerRestoreAllLabel(driver->securityManager,
                                      vm->def,
                                      migrated,
                                      priv->chardevStdioLogd);

    if (transactionStarted &&
        virSecurityManagerTransactionCommit(driver->securityManager, -1) < 0)
        VIR_WARN("Unable to run security manager transaction");

    virSecurityManagerTransactionAbort(driver->securityManager);
}

static void
virNetworkEventDispatchDefaultFunc(virConnectPtr conn,
                                   virObjectEventPtr event,
                                   virConnectObjectEventGenericCallback cb,
                                   void *cbopaque)
{
    virNetworkPtr net = virGetNetwork(conn, event->meta.name, event->meta.uuid);
    if (!net)
        return;

    switch ((virNetworkEventID)event->eventID) {
    case VIR_NETWORK_EVENT_ID_LIFECYCLE:
        {
            virNetworkEventLifecyclePtr networkLifecycleEvent;

            networkLifecycleEvent = (virNetworkEventLifecyclePtr)event;
            ((virConnectNetworkEventLifecycleCallback)cb)(conn, net,
                                                          networkLifecycleEvent->type,
                                                          networkLifecycleEvent->detail,
                                                          cbopaque);
            goto cleanup;
        }

    case VIR_NETWORK_EVENT_ID_LAST:
        break;
    }
    VIR_WARN("Unexpected event ID %d", event->eventID);

 cleanup:
    virNetworkFree(net);
}

static virCPUCompareResult
virCPUppc64Compare(virCPUDefPtr host,
                   virCPUDefPtr cpu,
                   bool failIncompatible)
{
    virCPUCompareResult ret;
    char *message = NULL;

    if (!host || !host->model) {
        if (failIncompatible) {
            virReportError(VIR_ERR_CPU_INCOMPATIBLE, "%s",
                           _("unknown host CPU"));
        } else {
            VIR_WARN("unknown host CPU");
            ret = VIR_CPU_COMPARE_INCOMPATIBLE;
        }
        return -1;
    }

    ret = ppc64Compute(host, cpu, NULL, &message);

    if (failIncompatible && ret == VIR_CPU_COMPARE_INCOMPATIBLE) {
        ret = VIR_CPU_COMPARE_ERROR;
        if (message) {
            virReportError(VIR_ERR_CPU_INCOMPATIBLE, "%s", message);
        } else {
            virReportError(VIR_ERR_CPU_INCOMPATIBLE, NULL);
        }
    }
    VIR_FREE(message);

    return ret;
}

/*
 * Unregister a callback from a file handle
 * NB, it *must* be safe to call this from within a callback
 * For this reason we only ever set a flag in the existing list.
 * Actual deletion will be done out-of-band
 */
int virEventPollRemoveHandle(int watch)
{
    size_t i;
    PROBE(EVENT_POLL_REMOVE_HANDLE,
          "watch=%d",
          watch);

    if (watch <= 0) {
        VIR_WARN("Ignoring invalid remove watch %d", watch);
        return -1;
    }

    virMutexLock(&eventLoop.lock);
    for (i = 0; i < eventLoop.handlesCount; i++) {
        if (eventLoop.handles[i].deleted)
            continue;

        if (eventLoop.handles[i].watch == watch) {
            EVENT_DEBUG("mark delete %zu %d", i, eventLoop.handles[i].fd);
            eventLoop.handles[i].deleted = 1;
            virEventPollInterruptLocked();
            virMutexUnlock(&eventLoop.lock);
            return 0;
        }
    }
    virMutexUnlock(&eventLoop.lock);
    return -1;
}

/**
 * virHookCheck:
 * @driver: the driver name "daemon", "qemu", "lxc"...
 *
 * Check is there is an installed hook for the given driver, if this
 * is the case register it. Then subsequent calls to virHookCall
 * will call the hook if found.
 *
 * Returns 1 if found, 0 if not found, and -1 in case of error
 */
static int
virHookCheck(int no, const char *driver) {
    char *path;
    int ret;

    if (driver == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Invalid hook name for #%d"), no);
        return -1;
    }

    ret = virBuildPath(&path, LIBVIRT_HOOK_DIR, driver);
    if ((ret < 0) || (path == NULL)) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Failed to build path for %s hook"),
                       driver);
        return -1;
    }

    if (!virFileExists(path)) {
        ret = 0;
        VIR_DEBUG("No hook script %s", path);
    } else if (!virFileIsExecutable(path)) {
        ret = 0;
        VIR_WARN("Non-executable hook script %s", path);
    } else {
        ret = 1;
        VIR_DEBUG("Found hook script %s", path);
    }

    VIR_FREE(path);
    return ret;
}

void virNetClientIncomingEvent(virNetSocketPtr sock,
                               int events,
                               void *opaque)
{
    virNetClientPtr client = opaque;

    virNetClientLock(client);

    if (!client->sock)
        goto done;

    /* This should be impossible, but it doesn't hurt to check */
    if (client->waitDispatch)
        goto done;

    VIR_DEBUG("Event fired %p %d", sock, events);

    if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR)) {
        VIR_DEBUG("%s : VIR_EVENT_HANDLE_HANGUP or "
                  "VIR_EVENT_HANDLE_ERROR encountered", __FUNCTION__);
        virNetSocketRemoveIOCallback(sock);
        goto done;
    }

    if (virNetClientIOHandleInput(client) < 0) {
        VIR_WARN("Something went wrong during async message processing");
        virNetSocketRemoveIOCallback(sock);
    }

done:
    virNetClientUnlock(client);
}