C++ qemu_close函数代码示例

static int floppy_probe_device(const char *filename)
{
    int fd, ret;
    int prio = 0;
    struct floppy_struct fdparam;
    struct stat st;

    if (strstart(filename, "/dev/fd", NULL) &&
        !strstart(filename, "/dev/fdset/", NULL)) {
        prio = 50;
    }

    fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
    if (fd < 0) {
        goto out;
    }
    ret = fstat(fd, &st);
    if (ret == -1 || !S_ISBLK(st.st_mode)) {
        goto outc;
    }

    /* Attempt to detect via a floppy specific ioctl */
    ret = ioctl(fd, FDGETPRM, &fdparam);
    if (ret >= 0)
        prio = 100;

outc:
    qemu_close(fd);
out:
    return prio;
}

static void tpm_passthrough_destroy(TPMBackend *tb)
{
    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);

    tpm_passthrough_cancel_cmd(tb);

    tpm_backend_thread_end(&tpm_pt->tbt);

    qemu_close(tpm_pt->tpm_fd);
    qemu_close(tpm_pt->cancel_fd);

    g_free(tb->id);
    g_free(tb->path);
    g_free(tb->cancel_path);
    g_free(tpm_pt->tpm_dev);
}

static int raw_create(const char *filename, QEMUOptionParameter *options)
{
    int fd;
    int result = 0;
    int64_t total_size = 0;

    /* Read out options */
    while (options && options->name) {
        if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
            total_size = options->value.n / BDRV_SECTOR_SIZE;
        }
        options++;
    }

    fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
                   0644);
    if (fd < 0) {
        result = -errno;
    } else {
        if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
            result = -errno;
        }
        if (qemu_close(fd) != 0) {
            result = -errno;
        }
    }
    return result;
}

static int cdrom_probe_device(const char *filename)
{
    int fd, ret;
    int prio = 0;
    struct stat st;

    fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
    if (fd < 0) {
        goto out;
    }
    ret = fstat(fd, &st);
    if (ret == -1 || !S_ISBLK(st.st_mode)) {
        goto outc;
    }

    /* Attempt to detect via a CDROM specific ioctl */
    ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
    if (ret >= 0)
        prio = 100;

outc:
    qemu_close(fd);
out:
    return prio;
}

static int hdev_create(const char *filename, QEMUOptionParameter *options)
{
    int fd;
    int ret = 0;
    struct stat stat_buf;
    int64_t total_size = 0;

    /* Read out options */
    while (options && options->name) {
        if (!strcmp(options->name, "size")) {
            total_size = options->value.n / BDRV_SECTOR_SIZE;
        }
        options++;
    }

    fd = qemu_open(filename, O_WRONLY | O_BINARY);
    if (fd < 0)
        return -errno;

    if (fstat(fd, &stat_buf) < 0)
        ret = -errno;
    else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
        ret = -ENODEV;
    else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
        ret = -ENOSPC;

    qemu_close(fd);
    return ret;
}

static void floppy_eject(BlockDriverState *bs, bool eject_flag)
{
    BDRVRawState *s = bs->opaque;
    int fd;

    if (s->fd >= 0) {
        qemu_close(s->fd);
        s->fd = -1;
    }
    fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
    if (fd >= 0) {
        if (ioctl(fd, FDEJECT, 0) < 0)
            perror("FDEJECT");
        qemu_close(fd);
    }
}

static int raw_open_common(BlockDriverState *bs, QDict *options,
                           int bdrv_flags, int open_flags)
{
    BDRVRawState *s = bs->opaque;
    QemuOpts *opts;
    Error *local_err = NULL;
    const char *filename;
    int fd, ret;

    opts = qemu_opts_create_nofail(&raw_runtime_opts);
    qemu_opts_absorb_qdict(opts, options, &local_err);
    if (error_is_set(&local_err)) {
        qerror_report_err(local_err);
        error_free(local_err);
        ret = -EINVAL;
        goto fail;
    }

    filename = qemu_opt_get(opts, "filename");

    ret = raw_normalize_devicepath(&filename);
    if (ret != 0) {
        goto fail;
    }

    s->open_flags = open_flags;
    raw_parse_flags(bdrv_flags, &s->open_flags);

    s->fd = -1;
    fd = qemu_open(filename, s->open_flags, 0644);
    if (fd < 0) {
        ret = -errno;
        if (ret == -EROFS) {
            ret = -EACCES;
        }
        goto fail;
    }
    s->fd = fd;

#ifdef CONFIG_LINUX_AIO
    if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
        qemu_close(fd);
        ret = -errno;
        goto fail;
    }
#endif

    s->has_discard = 1;
#ifdef CONFIG_XFS
    if (platform_test_xfs_fd(s->fd)) {
        s->is_xfs = 1;
    }
#endif

    ret = 0;
fail:
    qemu_opts_del(opts);
    return ret;
}

static void raw_close(BlockDriverState *bs)
{
    BDRVRawState *s = bs->opaque;
    if (s->fd >= 0) {
        qemu_close(s->fd);
        s->fd = -1;
    }
}

static void raw_reopen_abort(BDRVReopenState *state)
{
    BDRVRawReopenState *raw_s = state->opaque;

     /* nothing to do if NULL, we didn't get far enough */
    if (raw_s == NULL) {
        return;
    }

    if (raw_s->fd >= 0) {
        qemu_close(raw_s->fd);
        raw_s->fd = -1;
    }
    g_free(state->opaque);
    state->opaque = NULL;
}

static void raw_reopen_commit(BDRVReopenState *state)
{
    BDRVRawReopenState *raw_s = state->opaque;
    BDRVRawState *s = state->bs->opaque;

    s->open_flags = raw_s->open_flags;

    qemu_close(s->fd);
    s->fd = raw_s->fd;
#ifdef CONFIG_LINUX_AIO
    s->use_aio = raw_s->use_aio;
#endif

    g_free(state->opaque);
    state->opaque = NULL;
}

static int tpm_passthrough_handle_device_opts(QemuOpts *opts, TPMBackend *tb)
{
    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
    const char *value;

    value = qemu_opt_get(opts, "cancel-path");
    if (value) {
        tb->cancel_path = g_strdup(value);
    }

    value = qemu_opt_get(opts, "path");
    if (!value) {
        value = TPM_PASSTHROUGH_DEFAULT_DEVICE;
    }

    tpm_pt->tpm_dev = g_strdup(value);

    tb->path = g_strdup(tpm_pt->tpm_dev);

    tpm_pt->tpm_fd = qemu_open(tpm_pt->tpm_dev, O_RDWR);
    if (tpm_pt->tpm_fd < 0) {
        error_report("Cannot access TPM device using '%s': %s\n",
                     tpm_pt->tpm_dev, strerror(errno));
        goto err_free_parameters;
    }

    if (tpm_passthrough_test_tpmdev(tpm_pt->tpm_fd)) {
        error_report("'%s' is not a TPM device.\n",
                     tpm_pt->tpm_dev);
        goto err_close_tpmdev;
    }

    return 0;

 err_close_tpmdev:
    qemu_close(tpm_pt->tpm_fd);
    tpm_pt->tpm_fd = -1;

 err_free_parameters:
    g_free(tb->path);
    tb->path = NULL;

    g_free(tpm_pt->tpm_dev);
    tpm_pt->tpm_dev = NULL;

    return 1;
}

/* Note: we do not have a reliable method to detect if the floppy is
   present. The current method is to try to open the floppy at every
   I/O and to keep it opened during a few hundreds of ms. */
static int fd_open(BlockDriverState *bs)
{
    BDRVRawState *s = bs->opaque;
    int last_media_present;

    if (s->type != FTYPE_FD)
        return 0;
    last_media_present = (s->fd >= 0);
    if (s->fd >= 0 &&
        (get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
        qemu_close(s->fd);
        s->fd = -1;
#ifdef DEBUG_FLOPPY
        printf("Floppy closed\n");
#endif
    }
    if (s->fd < 0) {
        if (s->fd_got_error &&
            (get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
#ifdef DEBUG_FLOPPY
            printf("No floppy (open delayed)\n");
#endif
            return -EIO;
        }
        s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
        if (s->fd < 0) {
            s->fd_error_time = get_clock();
            s->fd_got_error = 1;
            if (last_media_present)
                s->fd_media_changed = 1;
#ifdef DEBUG_FLOPPY
            printf("No floppy\n");
#endif
            return -EIO;
        }
#ifdef DEBUG_FLOPPY
        printf("Floppy opened\n");
#endif
    }
    if (!last_media_present)
        s->fd_media_changed = 1;
    s->fd_open_time = get_clock();
    s->fd_got_error = 0;
    return 0;
}

static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
{
    BDRVRawState *s = bs->opaque;

#if defined(__APPLE__) && defined(__MACH__)
    if (strstart(filename, "/dev/cdrom", NULL)) {
        kern_return_t kernResult;
        io_iterator_t mediaIterator;
        char bsdPath[ MAXPATHLEN ];
        int fd;

        kernResult = FindEjectableCDMedia( &mediaIterator );
        kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );

        if ( bsdPath[ 0 ] != '\0' ) {
            strcat(bsdPath,"s0");
            /* some CDs don't have a partition 0 */
            fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
            if (fd < 0) {
                bsdPath[strlen(bsdPath)-1] = '1';
            } else {
                qemu_close(fd);
            }
            filename = bsdPath;
        }

        if ( mediaIterator )
            IOObjectRelease( mediaIterator );
    }
#endif

    s->type = FTYPE_FILE;
#if defined(__linux__)
    {
        char resolved_path[ MAXPATHLEN ], *temp;

        temp = realpath(filename, resolved_path);
        if (temp && strstart(temp, "/dev/sg", NULL)) {
            bs->sg = 1;
        }
    }
#endif

    return raw_open_common(bs, filename, flags, 0);
}

static int floppy_open(BlockDriverState *bs, QDict *options, int flags)
{
    BDRVRawState *s = bs->opaque;
    int ret;

    s->type = FTYPE_FD;

    /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
    ret = raw_open_common(bs, options, flags, O_NONBLOCK);
    if (ret)
        return ret;

    /* close fd so that we can reopen it as needed */
    qemu_close(s->fd);
    s->fd = -1;
    s->fd_media_changed = 1;

    return 0;
}

static int raw_open_common(BlockDriverState *bs, const char *filename,
                           int bdrv_flags, int open_flags)
{
    BDRVRawState *s = bs->opaque;
    int fd, ret;

    ret = raw_normalize_devicepath(&filename);
    if (ret != 0) {
        return ret;
    }

    s->open_flags = open_flags;
    raw_parse_flags(bdrv_flags, &s->open_flags);

    s->fd = -1;
    fd = qemu_open(filename, s->open_flags, 0644);
    if (fd < 0) {
        ret = -errno;
        if (ret == -EROFS)
            ret = -EACCES;
        return ret;
    }
    s->fd = fd;

#ifdef CONFIG_LINUX_AIO
    if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
        qemu_close(fd);
        return -errno;
    }
#endif

    s->has_discard = 1;
#ifdef CONFIG_XFS
    if (platform_test_xfs_fd(s->fd)) {
        s->is_xfs = 1;
    }
#endif

    return 0;
}