C++ STRPREFIX函数代码示例

/* Debian/Ubuntu install disks are easy ...
 *
 * These files are added by the debian-cd program, and it is worth
 * looking at the source code to determine exact values, in
 * particular '/usr/share/debian-cd/tools/start_new_disc'
 *
 * XXX Architecture?  We could parse it out of the product name
 * string, but that seems quite hairy.  We could look for the names
 * of packages.  Also note that some Debian install disks are
 * multiarch.
 */
static int
check_debian_installer_root (guestfs_h *g, struct inspect_fs *fs)
{
  fs->product_name = guestfs_int_first_line_of_file (g, "/.disk/info");
  if (!fs->product_name)
    return -1;

  fs->type = OS_TYPE_LINUX;
  if (STRPREFIX (fs->product_name, "Ubuntu"))
    fs->distro = OS_DISTRO_UBUNTU;
  else if (STRPREFIX (fs->product_name, "Debian"))
    fs->distro = OS_DISTRO_DEBIAN;

  (void) guestfs_int_parse_major_minor (g, fs);

  if (guestfs_is_file (g, "/.disk/cd_type") > 0) {
    CLEANUP_FREE char *cd_type =
      guestfs_int_first_line_of_file (g, "/.disk/cd_type");
    if (!cd_type)
      return -1;

    if (STRPREFIX (cd_type, "dvd/single") ||
        STRPREFIX (cd_type, "full_cd/single")) {
      fs->is_multipart_disk = 0;
      fs->is_netinst_disk = 0;
    }
    else if (STRPREFIX (cd_type, "dvd") ||
             STRPREFIX (cd_type, "full_cd")) {
      fs->is_multipart_disk = 1;
      fs->is_netinst_disk = 0;
    }
    else if (STRPREFIX (cd_type, "not_complete")) {
      fs->is_multipart_disk = 0;
      fs->is_netinst_disk = 1;
    }
  }

  return 0;
}

static int
xenParseXLDiskSrc(virDomainDiskDefPtr disk, char *srcstr)
{
    char *tmpstr = NULL;
    int ret = -1;

    if (STRPREFIX(srcstr, "rbd:")) {
        if (!(tmpstr = virStringReplace(srcstr, "\\\\", "\\")))
            goto cleanup;

        virDomainDiskSetType(disk, VIR_STORAGE_TYPE_NETWORK);
        disk->src->protocol = VIR_STORAGE_NET_PROTOCOL_RBD;
        ret = virStorageSourceParseRBDColonString(tmpstr, disk->src);
    } else {
        if (virDomainDiskSetSource(disk, srcstr) < 0)
            goto cleanup;

        ret = 0;
    }

 cleanup:
    VIR_FREE(tmpstr);
    return ret;
}

static bool
qemuHostdevHostSupportsPassthroughVFIO(void)
{
    DIR *iommuDir = NULL;
    struct dirent *iommuGroup = NULL;
    bool ret = false;

    /* condition 1 - /sys/kernel/iommu_groups/ contains entries */
    if (!(iommuDir = opendir("/sys/kernel/iommu_groups/")))
        goto cleanup;

    while ((iommuGroup = readdir(iommuDir))) {
        /* skip ./ ../ */
        if (STRPREFIX(iommuGroup->d_name, "."))
            continue;

        /* assume we found a group */
        break;
    }

    if (!iommuGroup)
        goto cleanup;
    /* okay, iommu is on and recognizes groups */

    /* condition 2 - /dev/vfio/vfio exists */
    if (!virFileExists("/dev/vfio/vfio"))
        goto cleanup;

    ret = true;

cleanup:
    if (iommuDir)
        closedir(iommuDir);

    return ret;
}

/* Split "/dev/VG/LV" into "VG" and "LV".  This function should
 * probably do more checks.
 */
int
vg_lv_parse (const char *device, char **vg, char **lv)
{
  if (STRPREFIX (device, "/dev/"))
    device += 5;

  const char *p = strchr (device, '/');
  if (p == NULL)
    return -1;

  if (vg) {
    *vg = strndup (device, p - device);
    if (*vg == NULL)
      error (EXIT_FAILURE, errno, "strndup");
  }

  if (lv) {
    *lv = strdup (p+1);
    if (*lv == NULL)
      error (EXIT_FAILURE, errno, "strndup");
  }

  return 0;
}

/**
 * virNumaGetPages:
 * @node: NUMA node id
 * @pages_size: list of pages supported on @node
 * @pages_avail: list of the pool sizes on @node
 * @pages_free: list of free pages on @node
 * @npages: the lists size
 *
 * For given NUMA node fetch info on pages. The size of pages
 * (e.g.  4K, 2M, 1G) is stored into @pages_size, the size of the
 * pool is then stored into @pages_avail and the number of free
 * pages in the pool is stored into @pages_free.
 *
 * If you're interested only in some lists, pass NULL to the
 * other ones.
 *
 * As a special case, if @node == -1, overall info is fetched
 * from the system.
 *
 * Returns 0 on success, -1 otherwise.
 */
int
virNumaGetPages(int node,
                unsigned int **pages_size,
                unsigned int **pages_avail,
                unsigned int **pages_free,
                size_t *npages)
{
    int ret = -1;
    char *path = NULL;
    DIR *dir = NULL;
    int direrr = 0;
    struct dirent *entry;
    unsigned int *tmp_size = NULL, *tmp_avail = NULL, *tmp_free = NULL;
    unsigned int ntmp = 0;
    size_t i;
    bool exchange;
    long system_page_size;
    unsigned long long huge_page_sum = 0;

    /* sysconf() returns page size in bytes,
     * but we are storing the page size in kibibytes. */
    system_page_size = virGetSystemPageSizeKB();

    /* Query huge pages at first.
     * On Linux systems, the huge pages pool cuts off the available memory and
     * is always shown as used memory. Here, however, we want to report
     * slightly different information. So we take the total memory on a node
     * and subtract memory taken by the huge pages. */
    if (virNumaGetHugePageInfoPath(&path, node, 0, NULL) < 0)
        goto cleanup;

    if (!(dir = opendir(path))) {
        /* It's okay if the @path doesn't exist. Maybe we are running on
         * system without huge pages support where the path may not exist. */
        if (errno != ENOENT) {
            virReportSystemError(errno,
                                 _("unable to open path: %s"),
                                 path);
            goto cleanup;
        }
    }

    while (dir && (direrr = virDirRead(dir, &entry, path)) > 0) {
        const char *page_name = entry->d_name;
        unsigned int page_size, page_avail = 0, page_free = 0;
        char *end;

        /* Just to give you a hint, we're dealing with this:
         * hugepages-2048kB/  or   hugepages-1048576kB/ */
        if (!STRPREFIX(entry->d_name, HUGEPAGES_PREFIX))
            continue;

        page_name += strlen(HUGEPAGES_PREFIX);

        if (virStrToLong_ui(page_name, &end, 10, &page_size) < 0 ||
                STRCASENEQ(end, "kB")) {
            virReportError(VIR_ERR_INTERNAL_ERROR,
                           _("unable to parse %s"),
                           entry->d_name);
            goto cleanup;
        }

        if (virNumaGetHugePageInfo(node, page_size,
                                   &page_avail, &page_free) < 0)
            goto cleanup;

        if (VIR_REALLOC_N(tmp_size, ntmp + 1) < 0 ||
                VIR_REALLOC_N(tmp_avail, ntmp + 1) < 0 ||
                VIR_REALLOC_N(tmp_free, ntmp + 1) < 0)
            goto cleanup;

        tmp_size[ntmp] = page_size;
        tmp_avail[ntmp] = page_avail;
        tmp_free[ntmp] = page_free;
        ntmp++;

        /* page_size is in kibibytes while we want huge_page_sum
         * in just bytes. */
        huge_page_sum += 1024 * page_size * page_avail;
//.........这里部分代码省略.........

static int
xenParseXLUSB(virConfPtr conf, virDomainDefPtr def)
{
    virConfValuePtr list = virConfGetValue(conf, "usbdev");
    virDomainHostdevDefPtr hostdev = NULL;

    if (list && list->type == VIR_CONF_LIST) {
        list = list->list;
        while (list) {
            char bus[3];
            char device[3];
            char *key;
            int busNum;
            int devNum;

            bus[0] = device[0] = '\0';

            if ((list->type != VIR_CONF_STRING) || (list->str == NULL))
                goto skipusb;
            /* usbdev=['hostbus=1,hostaddr=3'] */
            key = list->str;
            while (key) {
                char *data;
                char *nextkey = strchr(key, ',');

                if (!(data = strchr(key, '=')))
                    goto skipusb;
                data++;

                if (STRPREFIX(key, "hostbus=")) {
                    int len = nextkey ? (nextkey - data) : sizeof(bus) - 1;
                    if (virStrncpy(bus, data, len, sizeof(bus)) == NULL) {
                        virReportError(VIR_ERR_INTERNAL_ERROR,
                                       _("bus %s too big for destination"),
                                       data);
                        goto skipusb;
                    }
                } else if (STRPREFIX(key, "hostaddr=")) {
                    int len = nextkey ? (nextkey - data) : sizeof(device) - 1;
                    if (virStrncpy(device, data, len, sizeof(device)) == NULL) {
                        virReportError(VIR_ERR_INTERNAL_ERROR,
                                       _("device %s too big for destination"),
                                       data);
                        goto skipusb;
                    }
                }

                while (nextkey && (nextkey[0] == ',' ||
                                   nextkey[0] == ' ' ||
                                   nextkey[0] == '\t'))
                    nextkey++;
                key = nextkey;
            }

            if (virStrToLong_i(bus, NULL, 16, &busNum) < 0)
                goto skipusb;
            if (virStrToLong_i(device, NULL, 16, &devNum) < 0)
                goto skipusb;
            if (!(hostdev = virDomainHostdevDefAlloc(NULL)))
               return -1;

            hostdev->managed = false;
            hostdev->source.subsys.type = VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB;
            hostdev->source.subsys.u.usb.bus = busNum;
            hostdev->source.subsys.u.usb.device = devNum;

            if (VIR_APPEND_ELEMENT(def->hostdevs, def->nhostdevs, hostdev) < 0) {
                virDomainHostdevDefFree(hostdev);
                return -1;
            }

        skipusb:
            list = list->next;
        }
    }

    return 0;
}

static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
                                               unsigned int type,
                                               const char *name,
                                               size_t nparams,
                                               virLockManagerParamPtr params,
                                               unsigned int flags)
{
    virLockManagerLockDaemonPrivatePtr priv = lock->privateData;
    char *newName = NULL;
    char *newLockspace = NULL;
    bool autoCreate = false;

    virCheckFlags(VIR_LOCK_MANAGER_RESOURCE_READONLY |
                  VIR_LOCK_MANAGER_RESOURCE_SHARED, -1);

    if (flags & VIR_LOCK_MANAGER_RESOURCE_READONLY)
        return 0;

    switch (type) {
    case VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK:
        if (params || nparams) {
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                           _("Unexpected parameters for disk resource"));
            return -1;
        }
        if (!driver->autoDiskLease) {
            if (!(flags & (VIR_LOCK_MANAGER_RESOURCE_SHARED |
                           VIR_LOCK_MANAGER_RESOURCE_READONLY)))
                priv->hasRWDisks = true;
            return 0;
        }

        /* XXX we should somehow pass in TYPE=BLOCK info
         * from the domain_lock code, instead of assuming /dev
         */
        if (STRPREFIX(name, "/dev") &&
            driver->lvmLockSpaceDir) {
            VIR_DEBUG("Trying to find an LVM UUID for %s", name);
            if (virStorageFileGetLVMKey(name, &newName) < 0)
                goto error;

            if (newName) {
                VIR_DEBUG("Got an LVM UUID %s for %s", newName, name);
                if (!(newLockspace = strdup(driver->lvmLockSpaceDir)))
                    goto no_memory;
                autoCreate = true;
                break;
            }
            virResetLastError();
            /* Fallback to generic non-block code */
        }

        if (STRPREFIX(name, "/dev") &&
            driver->scsiLockSpaceDir) {
            VIR_DEBUG("Trying to find an SCSI ID for %s", name);
            if (virStorageFileGetSCSIKey(name, &newName) < 0)
                goto error;

            if (newName) {
                VIR_DEBUG("Got an SCSI ID %s for %s", newName, name);
                if (!(newLockspace = strdup(driver->scsiLockSpaceDir)))
                    goto no_memory;
                autoCreate = true;
                break;
            }
            virResetLastError();
            /* Fallback to generic non-block code */
        }

        if (driver->fileLockSpaceDir) {
            if (!(newLockspace = strdup(driver->fileLockSpaceDir)))
                goto no_memory;
            if (!(newName = virLockManagerLockDaemonDiskLeaseName(name)))
                goto no_memory;
            autoCreate = true;
            VIR_DEBUG("Using indirect lease %s for %s", newName, name);
        } else {
            if (!(newLockspace = strdup("")))
                goto no_memory;
            if (!(newName = strdup(name)))
                goto no_memory;
            VIR_DEBUG("Using direct lease for %s", name);
        }

        break;
    case VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE: {
        size_t i;
        char *path = NULL;
        char *lockspace = NULL;
        for (i = 0 ; i < nparams ; i++) {
            if (STREQ(params[i].key, "offset")) {
                if (params[i].value.ul != 0) {
                    virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                   _("Offset must be zero for this lock manager"));
                    return -1;
                }
            } else if (STREQ(params[i].key, "lockspace")) {
                lockspace = params[i].value.str;
            } else if (STREQ(params[i].key, "path")) {
                path = params[i].value.str;
//.........这里部分代码省略.........

static int testCompareXMLToArgvFiles(const char *xml,
                                     const char *cmdline,
                                     virBitmapPtr extraFlags,
                                     const char *migrateFrom,
                                     int migrateFd,
                                     bool json,
                                     bool expectError)
{
    char *expectargv = NULL;
    int len;
    char *actualargv = NULL;
    int ret = -1;
    virDomainDefPtr vmdef = NULL;
    virDomainChrSourceDef monitor_chr;
    virConnectPtr conn;
    char *log = NULL;
    char *emulator = NULL;
    virCommandPtr cmd = NULL;

    if (!(conn = virGetConnect()))
        goto fail;

    len = virtTestLoadFile(cmdline, &expectargv);
    if (len < 0)
        goto fail;
    if (len && expectargv[len - 1] == '\n')
        expectargv[len - 1] = '\0';

    if (!(vmdef = virDomainDefParseFile(driver.caps, xml,
                                        QEMU_EXPECTED_VIRT_TYPES,
                                        VIR_DOMAIN_XML_INACTIVE)))
        goto fail;

    /*
     * For test purposes, we may want to fake emulator's output by providing
     * our own script instead of a real emulator. For this to work we need to
     * specify a relative path in <emulator/> element, which, however, is not
     * allowed by RelaxNG schema for domain XML. To work around it we add an
     * extra '/' at the beginning of relative emulator path so that it looks
     * like, e.g., "/./qemu.sh" or "/../emulator/qemu.sh" instead of
     * "./qemu.sh" or "../emulator/qemu.sh" respectively. The following code
     * detects such paths, strips the extra '/' and makes the path absolute.
     */
    if (vmdef->emulator && STRPREFIX(vmdef->emulator, "/.")) {
        if (!(emulator = strdup(vmdef->emulator + 1)))
            goto fail;
        free(vmdef->emulator);
        vmdef->emulator = NULL;
        if (virAsprintf(&vmdef->emulator, "%s/qemuxml2argvdata/%s",
                        abs_srcdir, emulator) < 0)
            goto fail;
    }

    if (qemuCapsGet(extraFlags, QEMU_CAPS_DOMID))
        vmdef->id = 6;
    else
        vmdef->id = -1;

    memset(&monitor_chr, 0, sizeof(monitor_chr));
    monitor_chr.type = VIR_DOMAIN_CHR_TYPE_UNIX;
    monitor_chr.data.nix.path = (char *)"/tmp/test-monitor";
    monitor_chr.data.nix.listen = true;

    qemuCapsSetList(extraFlags,
                    QEMU_CAPS_VNC_COLON,
                    QEMU_CAPS_NO_REBOOT,
                    QEMU_CAPS_LAST);

    if (qemudCanonicalizeMachine(&driver, vmdef) < 0)
        goto fail;

    if (qemuCapsGet(extraFlags, QEMU_CAPS_DEVICE)) {
        qemuDomainPCIAddressSetPtr pciaddrs;
        if (!(pciaddrs = qemuDomainPCIAddressSetCreate(vmdef)))
            goto fail;

        if (qemuAssignDevicePCISlots(vmdef, pciaddrs) < 0)
            goto fail;

        qemuDomainPCIAddressSetFree(pciaddrs);
    }


    free(virtTestLogContentAndReset());
    virResetLastError();

    /* We do not call qemuCapsExtractVersionInfo() before calling
     * qemuBuildCommandLine(), so we should set QEMU_CAPS_PCI_MULTIBUS for
     * x86_64 and i686 architectures here.
     */
    if (STREQLEN(vmdef->os.arch, "x86_64", 6) ||
        STREQLEN(vmdef->os.arch, "i686", 4)) {
        qemuCapsSet(extraFlags, QEMU_CAPS_PCI_MULTIBUS);
    }

    if (qemuAssignDeviceAliases(vmdef, extraFlags) < 0)
        goto fail;

    if (!(cmd = qemuBuildCommandLine(conn, &driver,
                                     vmdef, &monitor_chr, json, extraFlags,
//.........这里部分代码省略.........

static virStorageVolPtr
esxStorageVolLookupByKey(virConnectPtr conn, const char *key)
{
    virStorageVolPtr volume = NULL;
    esxPrivate *priv = conn->privateData;
    esxVI_String *propertyNameList = NULL;
    esxVI_ObjectContent *datastoreList = NULL;
    esxVI_ObjectContent *datastore = NULL;
    char *datastoreName = NULL;
    esxVI_HostDatastoreBrowserSearchResults *searchResultsList = NULL;
    esxVI_HostDatastoreBrowserSearchResults *searchResults = NULL;
    char *directoryAndFileName = NULL;
    size_t length;
    char *datastorePath = NULL;
    char *volumeName = NULL;
    esxVI_FileInfo *fileInfo = NULL;
    char *uuid_string = NULL;
    char key_candidate[VIR_UUID_STRING_BUFLEN] = "";

    if (STRPREFIX(key, "[")) {
        /* Key is probably a datastore path */
        return esxStorageVolLookupByPath(conn, key);
    }

    if (!priv->primary->hasQueryVirtualDiskUuid) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("QueryVirtualDiskUuid not available, "
                         "cannot lookup storage volume by UUID"));
        return NULL;
    }

    /* Lookup all datastores */
    if (esxVI_String_AppendValueToList(&propertyNameList, "summary.name") < 0 ||
        esxVI_LookupDatastoreList(priv->primary, propertyNameList,
                                  &datastoreList) < 0) {
        goto cleanup;
    }

    for (datastore = datastoreList; datastore;
         datastore = datastore->_next) {
        datastoreName = NULL;

        if (esxVI_GetStringValue(datastore, "summary.name", &datastoreName,
                                 esxVI_Occurrence_RequiredItem) < 0) {
            goto cleanup;
        }

        /* Lookup datastore content */
        esxVI_HostDatastoreBrowserSearchResults_Free(&searchResultsList);

        if (esxVI_LookupDatastoreContentByDatastoreName
              (priv->primary, datastoreName, &searchResultsList) < 0) {
            goto cleanup;
        }

        /* Interpret search result */
        for (searchResults = searchResultsList; searchResults;
             searchResults = searchResults->_next) {
            VIR_FREE(directoryAndFileName);

            if (esxUtil_ParseDatastorePath(searchResults->folderPath, NULL,
                                           NULL, &directoryAndFileName) < 0) {
                goto cleanup;
            }

            /* Strip trailing separators */
            length = strlen(directoryAndFileName);

            while (length > 0 && directoryAndFileName[length - 1] == '/') {
                directoryAndFileName[length - 1] = '\0';
                --length;
            }

            /* Build datastore path and query the UUID */
            for (fileInfo = searchResults->file; fileInfo;
                 fileInfo = fileInfo->_next) {
                VIR_FREE(datastorePath);

                if (length < 1) {
                    if (VIR_STRDUP(volumeName, fileInfo->path) < 0)
                        goto cleanup;
                } else if (virAsprintf(&volumeName, "%s/%s",
                                       directoryAndFileName,
                                       fileInfo->path) < 0) {
                    goto cleanup;
                }

                if (virAsprintf(&datastorePath, "[%s] %s", datastoreName,
                                volumeName) < 0)
                    goto cleanup;

                if (!esxVI_VmDiskFileInfo_DynamicCast(fileInfo)) {
                    /* Only a VirtualDisk has a UUID */
                    continue;
                }

                VIR_FREE(uuid_string);

                if (esxVI_QueryVirtualDiskUuid
                      (priv->primary, datastorePath,
//.........这里部分代码省略.........

/* ppc64 parser.
 * Format : PowerPC <machine> <description>
 */
static int
qemuCapsParsePPCModels(const char *output,
                       unsigned int *retcount,
                       const char ***retcpus)
{
    const char *p = output;
    const char *next;
    unsigned int count = 0;
    const char **cpus = NULL;
    int i, ret = -1;

    do {
        const char *t;

        if ((next = strchr(p, '\n')))
            next++;

        if (!STRPREFIX(p, "PowerPC "))
            continue;

        /* Skip the preceding sub-string "PowerPC " */
        p += 8;

        /*Malformed string, does not obey the format 'PowerPC <model> <desc>'*/
        if (!(t = strchr(p, ' ')) || (next && t >= next))
            continue;

        if (*p == '\0')
            break;

        if (*p == '\n')
            continue;

        if (retcpus) {
            unsigned int len;

            if (VIR_REALLOC_N(cpus, count + 1) < 0) {
                virReportOOMError();
                goto cleanup;
            }

            len = t - p - 1;

            if (!(cpus[count] = strndup(p, len))) {
                virReportOOMError();
                goto cleanup;
            }
        }
        count++;
    } while ((p = next));

    if (retcount)
        *retcount = count;
    if (retcpus) {
        *retcpus = cpus;
        cpus = NULL;
    }
    ret = 0;

cleanup:
    if (cpus) {
        for (i = 0; i < count; i++)
            VIR_FREE(cpus[i]);
        VIR_FREE(cpus);
    }
    return ret;
}

/* Format is:
 * <machine> <desc> [(default)|(alias of <canonical>)]
 */
static int
qemuCapsParseMachineTypesStr(const char *output,
                             virCapsGuestMachinePtr **machines,
                             int *nmachines)
{
    const char *p = output;
    const char *next;
    virCapsGuestMachinePtr *list = NULL;
    int nitems = 0;

    do {
        const char *t;
        virCapsGuestMachinePtr machine;

        if ((next = strchr(p, '\n')))
            ++next;

        if (STRPREFIX(p, "Supported machines are:"))
            continue;

        if (!(t = strchr(p, ' ')) || (next && t >= next))
            continue;

        if (VIR_ALLOC(machine) < 0)
            goto no_memory;

        if (!(machine->name = strndup(p, t - p))) {
            VIR_FREE(machine);
            goto no_memory;
        }

        if (VIR_REALLOC_N(list, nitems + 1) < 0) {
            VIR_FREE(machine->name);
            VIR_FREE(machine);
            goto no_memory;
        }

        p = t;
        if (!(t = strstr(p, "(default)")) || (next && t >= next)) {
            list[nitems++] = machine;
        } else {
            /* put the default first in the list */
            memmove(list + 1, list, sizeof(*list) * nitems);
            list[0] = machine;
            nitems++;
        }

        if ((t = strstr(p, "(alias of ")) && (!next || t < next)) {
            p = t + strlen("(alias of ");
            if (!(t = strchr(p, ')')) || (next && t >= next))
                continue;

            if (!(machine->canonical = strndup(p, t - p)))
                goto no_memory;
        }
    } while ((p = next));

    *machines = list;
    *nmachines = nitems;

    return 0;

  no_memory:
    virReportOOMError();
    virCapabilitiesFreeMachines(list, nitems);
    return -1;
}

int linuxNodeGetCPUStats(FILE *procstat,
                         int cpuNum,
                         virNodeCPUStatsPtr params,
                         int *nparams)
{
    int ret = -1;
    char line[1024];
    unsigned long long usr, ni, sys, idle, iowait;
    unsigned long long irq, softirq, steal, guest, guest_nice;
    char cpu_header[3 + INT_BUFSIZE_BOUND(cpuNum)];

    if ((*nparams) == 0) {
        /* Current number of cpu stats supported by linux */
        *nparams = LINUX_NB_CPU_STATS;
        ret = 0;
        goto cleanup;
    }

    if ((*nparams) != LINUX_NB_CPU_STATS) {
        nodeReportError(VIR_ERR_INVALID_ARG,
                        "%s", _("Invalid parameter count"));
        goto cleanup;
    }

    if (cpuNum == VIR_NODE_CPU_STATS_ALL_CPUS) {
        strcpy(cpu_header, "cpu");
    } else {
        snprintf(cpu_header, sizeof(cpu_header), "cpu%d", cpuNum);
    }

    while (fgets(line, sizeof(line), procstat) != NULL) {
        char *buf = line;

        if (STRPREFIX(buf, cpu_header)) { /* aka logical CPU time */
            int i;

            if (sscanf(buf,
                       "%*s %llu %llu %llu %llu %llu" // user ~ iowait
                       "%llu %llu %llu %llu %llu",    // irq  ~ guest_nice
                       &usr, &ni, &sys, &idle, &iowait,
                       &irq, &softirq, &steal, &guest, &guest_nice) < 4) {
                continue;
            }

            for (i = 0; i < *nparams; i++) {
                virNodeCPUStatsPtr param = &params[i];

                switch (i) {
                case 0: /* fill kernel cpu time here */
                    if (virStrcpyStatic(param->field, VIR_NODE_CPU_STATS_KERNEL) == NULL) {
                        nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                        "%s", _("Field kernel cpu time too long for destination"));
                        goto cleanup;
                    }
                    param->value = (sys + irq + softirq) * TICK_TO_NSEC;
                    break;

                case 1: /* fill user cpu time here */
                    if (virStrcpyStatic(param->field, VIR_NODE_CPU_STATS_USER) == NULL) {
                        nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                        "%s", _("Field kernel cpu time too long for destination"));
                        goto cleanup;
                    }
                    param->value = (usr + ni) * TICK_TO_NSEC;
                    break;

                case 2: /* fill idle cpu time here */
                    if (virStrcpyStatic(param->field, VIR_NODE_CPU_STATS_IDLE) == NULL) {
                        nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                        "%s", _("Field kernel cpu time too long for destination"));
                        goto cleanup;
                    }
                    param->value = idle * TICK_TO_NSEC;
                    break;

                case 3: /* fill iowait cpu time here */
                    if (virStrcpyStatic(param->field, VIR_NODE_CPU_STATS_IOWAIT) == NULL) {
                        nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                        "%s", _("Field kernel cpu time too long for destination"));
                        goto cleanup;
                    }
                    param->value = iowait * TICK_TO_NSEC;
                    break;

                default:
                    break;
                    /* should not hit here */
                }
            }
            ret = 0;
            goto cleanup;
        }
    }

    nodeReportError(VIR_ERR_INVALID_ARG, "%s", _("Invalid cpu number"));

cleanup:
    return ret;
}

int linuxNodeInfoCPUPopulate(FILE *cpuinfo,
                             const char *sysfs_cpudir,
                             virNodeInfoPtr nodeinfo)
{
    char line[1024];
    DIR *cpudir = NULL;
    struct dirent *cpudirent = NULL;
    unsigned int cpu;
    unsigned long core, sock, cur_threads;
    cpu_set_t core_mask;
    cpu_set_t socket_mask;
    int online;

    nodeinfo->cpus = 0;
    nodeinfo->mhz = 0;
    nodeinfo->cores = 0;

    nodeinfo->nodes = 1;
# if HAVE_NUMACTL
    if (numa_available() >= 0)
        nodeinfo->nodes = numa_max_node() + 1;
# endif

    if (!virStrcpyStatic(sysfs_path, sysfs_cpudir)) {
        virReportSystemError(errno, _("cannot copy %s"), sysfs_cpudir);
        return -1;
    }
    /* NB: It is impossible to fill our nodes, since cpuinfo
     * has no knowledge of NUMA nodes */

    /* NOTE: hyperthreads are ignored here; they are parsed out of /sys */
    while (fgets(line, sizeof(line), cpuinfo) != NULL) {
# if defined(__x86_64__) || \
    defined(__amd64__)  || \
    defined(__i386__)
        char *buf = line;
        if (STRPREFIX(buf, "cpu MHz")) {
            char *p;
            unsigned int ui;
            buf += 9;
            while (*buf && c_isspace(*buf))
                buf++;
            if (*buf != ':' || !buf[1]) {
                nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                "%s", _("parsing cpuinfo cpu MHz"));
                return -1;
            }
            if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0
                /* Accept trailing fractional part.  */
                && (*p == '\0' || *p == '.' || c_isspace(*p)))
                nodeinfo->mhz = ui;
        }
# elif defined(__powerpc__) || \
      defined(__powerpc64__)
        char *buf = line;
        if (STRPREFIX(buf, "clock")) {
            char *p;
            unsigned int ui;
            buf += 5;
            while (*buf && c_isspace(*buf))
                buf++;
            if (*buf != ':' || !buf[1]) {
                nodeReportError(VIR_ERR_INTERNAL_ERROR,
                                "%s", _("parsing cpuinfo cpu MHz"));
                return -1;
            }
            if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0
                /* Accept trailing fractional part.  */
                && (*p == '\0' || *p == '.' || c_isspace(*p)))
                nodeinfo->mhz = ui;
            /* No other interesting infos are available in /proc/cpuinfo.
             * However, there is a line identifying processor's version,
             * identification and machine, but we don't want it to be caught
             * and parsed in next iteration, because it is not in expected
             * format and thus lead to error. */
        }
# else
#  warning Parser for /proc/cpuinfo needs to be adapted for your architecture
# endif
    }

    /* OK, we've parsed clock speed out of /proc/cpuinfo. Get the core, socket
     * thread and topology information from /sys
     */
    cpudir = opendir(sysfs_cpudir);
    if (cpudir == NULL) {
        virReportSystemError(errno, _("cannot opendir %s"), sysfs_cpudir);
        return -1;
    }

    CPU_ZERO(&core_mask);
    CPU_ZERO(&socket_mask);

    while ((cpudirent = readdir(cpudir))) {
        if (sscanf(cpudirent->d_name, "cpu%u", &cpu) != 1)
            continue;

        online = cpu_online(cpu);
        if (online < 0) {
            closedir(cpudir);
//.........这里部分代码省略.........

/**
 * xenInotifyOpen:
 * @conn: pointer to the connection block
 * @name: URL for the target, NULL for local
 * @flags: combination of virDrvOpenFlag(s)
 *
 * Connects and starts listening for inotify events
 *
 * Returns 0 or -1 in case of error.
 */
int
xenInotifyOpen(virConnectPtr conn,
               virConnectAuthPtr auth ATTRIBUTE_UNUSED,
               unsigned int flags)
{
    DIR *dh;
    struct dirent *ent;
    char *path;
    xenUnifiedPrivatePtr priv = conn->privateData;

    virCheckFlags(VIR_CONNECT_RO, -1);

    if (priv->configDir) {
        priv->useXenConfigCache = 1;
    } else {
        /* /var/lib/xend/domains/<uuid>/config.sxp */
        priv->configDir = XEND_DOMAINS_DIR;
        priv->useXenConfigCache = 0;

        if (VIR_ALLOC(priv->configInfoList) < 0)
            return -1;

        /* populate initial list */
        if (!(dh = opendir(priv->configDir))) {
            virReportSystemError(errno,
                                 _("cannot open directory: %s"),
                                 priv->configDir);
            return -1;
        }
        while ((ent = readdir(dh))) {
            if (STRPREFIX(ent->d_name, "."))
                continue;

            /* Build the full file path */
            if (!(path = virFileBuildPath(priv->configDir, ent->d_name, NULL))) {
                closedir(dh);
                return -1;
            }

            if (xenInotifyAddDomainConfigInfo(conn, path) < 0) {
                virReportError(VIR_ERR_INTERNAL_ERROR,
                               "%s", _("Error adding file to config list"));
                closedir(dh);
                VIR_FREE(path);
                return -1;
            }

            VIR_FREE(path);
        }
        closedir(dh);
    }

    if ((priv->inotifyFD = inotify_init()) < 0) {
        virReportSystemError(errno,
                             "%s", _("initializing inotify"));
        return -1;
    }

    VIR_DEBUG("Adding a watch on %s", priv->configDir);
    if (inotify_add_watch(priv->inotifyFD,
                          priv->configDir,
                          IN_CREATE |
                          IN_CLOSE_WRITE | IN_DELETE |
                          IN_MOVED_TO | IN_MOVED_FROM) < 0) {
        virReportSystemError(errno,
                             _("adding watch on %s"),
                             priv->configDir);
        return -1;
    }

    VIR_DEBUG("Building initial config cache");
    if (priv->useXenConfigCache &&
        xenXMConfigCacheRefresh(conn) < 0) {
        VIR_DEBUG("Failed to enable XM config cache %s", conn->err.message);
        return -1;
    }

    VIR_DEBUG("Registering with event loop");
    /* Add the handle for monitoring */
    if ((priv->inotifyWatch = virEventAddHandle(priv->inotifyFD, VIR_EVENT_HANDLE_READABLE,
                                                xenInotifyEvent, conn, NULL)) < 0) {
        VIR_DEBUG("Failed to add inotify handle, disabling events");
    }

    return 0;
}

//.........这里部分代码省略.........
                    goto cleanup;
            }
        }
    }

    GET_VALUE_STR("bridge_helper", cfg->bridgeHelperName);

    GET_VALUE_BOOL("mac_filter", cfg->macFilter);

    GET_VALUE_BOOL("relaxed_acs_check", cfg->relaxedACS);
    GET_VALUE_BOOL("clear_emulator_capabilities", cfg->clearEmulatorCapabilities);
    GET_VALUE_BOOL("allow_disk_format_probing", cfg->allowDiskFormatProbing);
    GET_VALUE_BOOL("set_process_name", cfg->setProcessName);
    GET_VALUE_ULONG("max_processes", cfg->maxProcesses);
    GET_VALUE_ULONG("max_files", cfg->maxFiles);

    GET_VALUE_STR("lock_manager", cfg->lockManagerName);
    GET_VALUE_STR("stdio_handler", stdioHandler);
    if (stdioHandler) {
        if (STREQ(stdioHandler, "logd")) {
            cfg->stdioLogD = true;
        } else if (STREQ(stdioHandler, "file")) {
            cfg->stdioLogD = false;
        } else {
            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                           _("Unknown stdio handler %s"),
                           stdioHandler);
            VIR_FREE(stdioHandler);
            goto cleanup;
        }
        VIR_FREE(stdioHandler);
    }

    GET_VALUE_ULONG("max_queued", cfg->maxQueuedJobs);

    GET_VALUE_LONG("keepalive_interval", cfg->keepAliveInterval);
    GET_VALUE_ULONG("keepalive_count", cfg->keepAliveCount);

    GET_VALUE_LONG("seccomp_sandbox", cfg->seccompSandbox);

    GET_VALUE_STR("migration_host", cfg->migrateHost);
    virStringStripIPv6Brackets(cfg->migrateHost);
    if (cfg->migrateHost &&
        (STRPREFIX(cfg->migrateHost, "localhost") ||
         virSocketAddrIsNumericLocalhost(cfg->migrateHost))) {
        virReportError(VIR_ERR_CONF_SYNTAX,
                       _("migration_host must not be the address of"
                         " the local machine: %s"),
                       cfg->migrateHost);
        goto cleanup;
    }

    GET_VALUE_STR("migration_address", cfg->migrationAddress);
    virStringStripIPv6Brackets(cfg->migrationAddress);
    if (cfg->migrationAddress &&
        (STRPREFIX(cfg->migrationAddress, "localhost") ||
         virSocketAddrIsNumericLocalhost(cfg->migrationAddress))) {
        virReportError(VIR_ERR_CONF_SYNTAX,
                       _("migration_address must not be the address of"
                         " the local machine: %s"),
                       cfg->migrationAddress);
        goto cleanup;
    }

    GET_VALUE_BOOL("log_timestamp", cfg->logTimestamp);

    if ((p = virConfGetValue(conf, "nvram"))) {
        size_t len;
        virConfValuePtr pp;

        CHECK_TYPE("nvram", VIR_CONF_LIST);

        virFirmwareFreeList(cfg->firmwares, cfg->nfirmwares);
        /* Calc length and check items */
        for (len = 0, pp = p->list; pp; len++, pp = pp->next) {
            if (pp->type != VIR_CONF_STRING) {
                virReportError(VIR_ERR_CONF_SYNTAX, "%s",
                               _("nvram must be a list of strings"));
                goto cleanup;
            }
        }

        if (len && VIR_ALLOC_N(cfg->firmwares, len) < 0)
            goto cleanup;
        cfg->nfirmwares = len;

        for (i = 0, pp = p->list; pp; i++, pp = pp->next) {
            if (VIR_ALLOC(cfg->firmwares[i]) < 0)
                goto cleanup;
            if (virFirmwareParse(pp->str, cfg->firmwares[i]) < 0)
                goto cleanup;
        }
    }

    ret = 0;

 cleanup:
    virConfFree(conf);
    return ret;
}