CODEWITHSUNDEEP
rustioctluinput
S. Velik
S. Velik

Reputation: 21

Rust ioctl() analog to ioctl(fd, UI_SET_EVBIT, EV_KEY);

I am new in rust and trying to rewrite example of https://kernel.org/doc/html/v4.19/input/uinput.html in rust using nix crate. But at already first ioctl() in C I have problem to find analog macro in nix::ioctl. I mean this one:

ioctl(fd, UI_SET_EVBIT, EV_KEY);

What could be a solution for this one?

Upvotes: 2

Views: 76

Answers (1)

Jmb
Jmb

Reputation: 23443

The nix crate doesn't allow you to call ioctl directly. Instead it offers macros to create wrappers around ioctl calls, then you can call these wrappers.

UI_SET_EVBIT is defined in linux/uinput.h as:

#define UINPUT_IOCTL_BASE    'U'
#define UI_SET_EVBIT                _IOW(UINPUT_IOCTL_BASE, 100, int)

which translate as:

const UINPUT_IOCTL_BASE: u8 = b'U'; // Defined in linux/uinput.h
ioctl_write_int!(ui_set_evbit, UINPUT_IOCTL_BASE, 100);

and you can now call the ui_set_evbit function like this:

const EV_KEY: nix::sys::ioctl::ioctl_param_type = 1; // Defined in linux/input-event-codes.h
unsafe ui_set_evbit (EV_KEY).unwrap();

Upvotes: 4

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