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 mem-
ory 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 UFF-
DIO_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 speci-
fied 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
Linux man-pages 6.9.1 2024-06-14 UFFDIO_WAKE(2const)
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