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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | EXAMPLES | SEE ALSO | COLOPHON |
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UFFDIO_CONTINUE(2const) UFFDIO_CONTINUE(2const)
UFFDIO_CONTINUE - resolve a minor page fault
Standard C library (libc, -lc)
#include <linux/userfaultfd.h> /* Definition of UFFD* constants */
#include <sys/ioctl.h>
int ioctl(int fd, UFFDIO_CONTINUE, struct uffdio_continue *argp);
#include <linux/userfaultfd.h>
struct uffdio_continue {
struct uffdio_range range;
/* Range to install PTEs for and continue */
__u64 mode; /* Flags controlling the behavior of continue */
__s64 mapped; /* Number of bytes mapped, or negated error */
};
Resolve a minor page fault by installing page table entries for
existing pages in the page cache.
The following value may be bitwise ORed in mode to change the
behavior of the UFFDIO_CONTINUE operation:
UFFDIO_CONTINUE_MODE_DONTWAKE
Do not wake up the thread that waits for page-fault
resolution.
The mapped field is used by the kernel to return the number of
bytes that were actually mapped, or an error in the same manner as
UFFDIO_COPY. If the value returned in the mapped field doesn't
match the value that was specified in range.len, the operation
fails with the error EAGAIN. The mapped field is output-only; it
is not read by the UFFDIO_CONTINUE operation.
This ioctl(2) operation returns 0 on success. In this case, the
entire area was mapped. On error, -1 is returned and errno is set
to indicate the error.
EAGAIN The number of bytes mapped (i.e., the value returned in the
mapped field) does not equal the value that was specified
in the range.len field.
EEXIST One or more pages were already mapped in the given range.
EFAULT No existing page could be found in the page cache for the
given range.
EINVAL Either range.start or range.len was not a multiple of the
system page size; or range.len was zero; or the range
specified was invalid.
EINVAL An invalid bit was specified in the mode field.
ENOENT The faulting process has changed its virtual memory layout
simultaneously with an outstanding UFFDIO_CONTINUE
operation.
ENOMEM Allocating memory needed to setup the page table mappings
failed.
ESRCH The faulting process has exited at the time of a
UFFDIO_CONTINUE operation.
Linux.
Linux 5.13.
See userfaultfd(2).
ioctl(2), ioctl_userfaultfd(2), userfaultfd(2)
linux.git/Documentation/admin-guide/mm/userfaultfd.rst
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 UFFDIO_CONTINUE(2const)
Pages that refer to this page: ioctl_userfaultfd(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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