UFFDIO_CONTINUE(2const) - Linux manual page (original) (raw)
UFFDIOCONTINUE(2const) UFFDIOCONTINUE(2const)
NAME top
UFFDIO_CONTINUE - resolve a minor page faultLIBRARY 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_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 */
**};**DESCRIPTION top
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.RETURN VALUE top
This [ioctl(2)](../man2/ioctl.2.html) operation returns 0 on success. In this case, the
entire area was mapped. On error, -1 is returned and _[errno](../man3/errno.3.html)_ is set
to indicate the error.ERRORS top
**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.STANDARDS top
Linux.HISTORY top
Linux 5.13.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), [userfaultfd(2)](../man2/userfaultfd.2.html)
_linux.git/Documentation/admin-guide/mm/userfaultfd.rst_COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-07-23 UFFDIOCONTINUE(2const)
Pages that refer to this page:ioctl_userfaultfd(2)