Enum Seal Copy item path Source #[non_exhaustive]
#[repr(u32)]
pub enum Seal {
Seal = 1,
Shrink = 2,
Grow = 4,
Write = 8,
FutureWrite = 16,
}
Expand description A seal that prevents certain actions from being performed on a file.
Note that seals apply to a file, not a file descriptor.
If two file descriptors refer to the same file, they share the same set of seals.
Seals can not be removed from a file once applied.
This enum is marked as non-exhaustive Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
Prevent adding more seals to the file.
Prevent the file from being shrunk with truncate
or similar.
Combine with Seal::Grow
to prevent the file from being resized in any way.
Prevent the file from being extended with truncate
, fallocate
or simillar.
Combine with Seal::Shrink
to prevent the file from being resized in any way.
Prevent write to the file.
This will block all writes to the file and prevents any shared, writable memory mappings from being created.
If a shared, writable memory mapping already exists, adding this seal will fail.
Similar to Seal::Write
, but allows existing shared, writable memory mappings to modify the file contents.
This can be used to share a read-only view of the file with other processes,
while still being able to modify the contents through an existing mapping.
The resulting type after applying the &
operator.
The resulting type after applying the &
operator.
The resulting type after applying the |
operator.
The resulting type after applying the |
operator.
The resulting type after applying the ^
operator.
The resulting type after applying the ^
operator.
Performs copy-assignment from
source
.
Read more Formats the value using the given formatter.
Read more Converts to this type from the input type.
Compares and returns the maximum of two values.
Read more Compares and returns the minimum of two values.
Read more Restrict a value to a certain interval.
Read more Tests for self
and other
values to be equal, and is used by ==
.
Tests for !=
. The default implementation is almost always sufficient,
and should not be overridden without very good reason.
This method returns an ordering between
self
and
other
values if one exists.
Read more Tests less than (for
self
and
other
) and is used by the
<
operator.
Read more Tests less than or equal to (for
self
and
other
) and is used by the
<=
operator.
Read more Tests greater than (for
self
and
other
) and is used by the
>
operator.
Read more Tests greater than or equal to (for
self
and
other
) and is used by
the
>=
operator.
Read more The resulting type after applying the -
operator.
The resulting type after applying the -
operator.
Immutably borrows from an owned value.
Read more Mutably borrows from an owned value.
Read more 🔬 This is a nightly-only experimental API. (clone_to_uninit
)
Performs copy-assignment from
self
to
dest
.
Read more Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From <T> for U
chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
Read more Uses borrowed data to replace owned data, usually by cloning.
Read more The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.