UFFDIO_WAKE(2const) - Linux manual page (original) (raw)

UFFDIOWAKE(2const) UFFDIOWAKE(2const)

NAME top

   UFFDIO_WAKE - wake up a thread waiting for page-fault resolution

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <linux/userfaultfd.h>** /* Definition of **UFFD*** constants */
   **#include <sys/ioctl.h>**

   **int ioctl(int** _fd_**, UFFDIO_WAKE, const struct uffdio_range ***_argp_**);**

DESCRIPTION top

   Wake up the thread waiting for page-fault resolution on a
   specified memory address range.

   The **UFFDIO_WAKE** operation is used in conjunction with **UFFDIO_COPY**
   and **UFFDIO_ZEROPAGE** operations that have the
   **UFFDIO_COPY_MODE_DONTWAKE** or **UFFDIO_ZEROPAGE_MODE_DONTWAKE** bit set
   in the _mode_ field.  The userfault monitor can perform several
   **UFFDIO_COPY** and **UFFDIO_ZEROPAGE** operations in a batch and then
   explicitly wake up the faulting thread using **UFFDIO_WAKE**.

RETURN VALUE top

   This [ioctl(2)](../man2/ioctl.2.html) operation returns 0 on success.  On error, -1 is
   returned and _[errno](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **EINVAL** The _start_ or the _len_ field of the _ufdiorange_ structure was
          not a multiple of the system page size; or _len_ was zero; or
          the specified range was otherwise invalid.

STANDARDS top

   Linux.

HISTORY top

   Linux 4.3.

EXAMPLES top

   See [userfaultfd(2)](../man2/userfaultfd.2.html).

SEE ALSO top

   [ioctl(2)](../man2/ioctl.2.html), [ioctl_userfaultfd(2)](../man2/ioctl%5Fuserfaultfd.2.html), [UFFDIO_REGISTER(2const)](../man2/UFFDIO%5FREGISTER.2const.html),
   [userfaultfd(2)](../man2/userfaultfd.2.html)

   _linux.git/Documentation/admin-guide/mm/userfaultfd.rst_

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Linux man-pages 6.10 2024-07-23 UFFDIOWAKE(2const)

Pages that refer to this page:ioctl_userfaultfd(2)