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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | EXAMPLES | SEE ALSO | COLOPHON |
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ioctl_userfaultfd(2) System Calls Manual ioctl_userfaultfd(2)
ioctl_userfaultfd - create a file descriptor for handling page
faults in user space
Standard C library (libc, -lc)
#include <linux/userfaultfd.h> /* Definition of UFFD* constants */
#include <sys/ioctl.h>
int ioctl(int fd, int op, ...);
Various ioctl(2) operations can be performed on a userfaultfd
object (created by a call to userfaultfd(2)) using calls of the
form:
ioctl(fd, op, argp);
In the above, fd is a file descriptor referring to a userfaultfd
object, op is one of the operations listed below, and argp is a
pointer to a data structure that is specific to op.
The various ioctl(2) operations are described below. The
UFFDIO_API, UFFDIO_REGISTER, and UFFDIO_UNREGISTER operations are
used to configure userfaultfd behavior. These operations allow
the caller to choose what features will be enabled and what kinds
of events will be delivered to the application. The remaining
operations are range operations. These operations enable the
calling application to resolve page-fault events.
UFFDIO_API(2const)
UFFDIO_REGISTER(2const)
UFFDIO_UNREGISTER(2const)
UFFDIO_COPY(2const)
UFFDIO_MOVE(2const)
UFFDIO_ZEROPAGE(2const)
UFFDIO_WAKE(2const)
UFFDIO_WRITEPROTECT(2const)
UFFDIO_CONTINUE(2const)
UFFDIO_POISON(2const)
On success, 0 is returned. On error, -1 is returned, and errno is
set to indicate the error.
The following general errors can occur for all of the operations
described above:
EFAULT argp does not point to a valid memory address.
EINVAL (For all operations except UFFDIO_API.) The userfaultfd
object has not yet been enabled (via the UFFDIO_API
operation).
Linux.
See userfaultfd(2).
ioctl(2), mmap(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-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 ioctl_userfaultfd(2)
Pages that refer to this page: ioctl(2), UFFDIO_API(2const), UFFDIO_CONTINUE(2const), UFFDIO_COPY(2const), UFFDIO_MOVE(2const), UFFDIO_POISON(2const), UFFDIO_REGISTER(2const), UFFDIO_UNREGISTER(2const), UFFDIO_WAKE(2const), UFFDIO_WRITEPROTECT(2const), UFFDIO_ZEROPAGE(2const), 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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