UFFDIO_WAKE(2const) — Linux manual page

UFFDIO_WAKE(2const)                                  UFFDIO_WAKE(2const)

NAME

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

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       int ioctl(int fd, UFFDIO_WAKE, const struct uffdio_range *argp);

DESCRIPTION

       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

       This ioctl(2) operation returns 0 on success.  On error, -1 is
       returned and errno is set to indicate the error.

ERRORS

       EINVAL The start or the len field of the ufdio_range structure
              was not a multiple of the system page size; or len was
              zero; or the specified range was otherwise invalid.

STANDARDS

       Linux.

HISTORY

       Linux 4.3.

EXAMPLES

       See userfaultfd(2).

SEE ALSO

       ioctl(2), ioctl_userfaultfd(2), UFFDIO_REGISTER(2const),
       userfaultfd(2)

       linux.git/Documentation/admin-guide/mm/userfaultfd.rst

COLOPHON

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Linux man-pages 6.9.1          2024-06-14            UFFDIO_WAKE(2const)

Pages that refer to this page: ioctl_userfaultfd(2)

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