1### Unreleased
2
3- Added `Uffd::read_events` that can read multiple events from the userfaultfd file descriptor.
4- Updated `bitflags` dependency to `2.2.1`.
5- Use `/dev/userfaultfd` as the default API for creating userfaultfd file descriptors.
6
7  Since Linux 5.11 a process can select if it wants to handle page faults triggered in kernel space
8  or not. Under this mechanism, processes that wish to handle those, need to have `CAP_SYS_PTRACE`
9  capability. `CAP_SYS_PTRACE` allows a process to do much more than create userfault fds, so with
10  6.1 Linux introduces `/dev/userfaultfd`, a special character device that allows creating
11  userfault file descriptors using the `USERFAULTFD_IOC_NEW` `ioctl`. Access to this device is
12  granted via file system permissions and does not require `CAP_SYS_PTRACE` to handle kernel
13  triggered page faults.
14
15  We now default to using `/dev/userfaultfd` for creating the descriptors and only if that file is
16  not present, we fall back to using the syscall.
17
18### 0.3.1 (2021-02-17)
19
20- Added support for the `UFFD_FEATURE_THREAD_ID` flag when compiled with the `linux4_14` Cargo
21  feature.
22
23### 0.3.0 (2021-02-03)
24
25- Update `bindgen` dependency of `userfaultfd-sys` to `0.57`. Thank you @jgowans
26
27### 0.2.1 (2020-11-20)
28
29- Make `ReadWrite` public. Thank you @electroCutie
30
31### 0.2.0 (2020-04-10)
32
33- Removed the compile-time Linux version check, and replaced it with a Cargo feature.
34
35  The Linux version check was overly restrictive, even on systems that did have the right kernel
36  version installed but had older headers in `/usr/include/linux`. Beyond that, this check made it
37  more difficult to compile on a different host than what's targeted.
38
39  There is now a `linux4_14` feature flag on `userfaultfd-sys`, which turns on and tests the extra
40  constants available in that version. Since `userfaultfd` did not make use of any of those newer
41  features, it doesn't have a feature flag yet.
42
43  Applications should take care when initializing with `UffdBuilder` to specify the features and
44  ioctls they require, so that an unsupported version will be detected at runtime.
45
46
47### 0.1.0 (2020-04-07)
48
49- Initial public release of userfaultfd-rs.
50