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This crate provides a safe interface for reading and writing information to the kernel using the sysctl interface.
[](https://cirrus-ci.com/github/johalun/sysctl-rs/master)
[](https://crates.io/crates/sysctl)
*FreeBSD, Linux, macOS and iOS are supported.*
*Contributions for improvements and other platforms are welcome.*
### Documentation
Documentation is available on [docs.rs](https://docs.rs/sysctl)
### Usage
Add to `Cargo.toml`
```toml
[dependencies]
sysctl = "*"
```
### macOS/iOS
* Due to limitations in the sysctl(3) API, many of the methods of
the `Ctl` take a mutable reference to `self` on macOS/iOS.
* Sysctl descriptions are not available on macOS/iOS and Linux.
* Some tests failures are ignored, as the respective sysctls do not
exist on macos.
### Example
sysctl comes with several examples, see the examples folder:
* `value.rs`: shows how to get a sysctl value
* `value_as.rs`: parsing values as structures
* `value_string.rs`: parsing values as string. Use this for cross platform compatibility since all sysctls are strings on Linux.
* `value_oid_as.rs`: getting a sysctl from OID constants from the `libc` crate.
* `set_value.rs`: shows how to set a sysctl value
* `struct.rs`: reading data into a struct
* `temperature.rs`: parsing temperatures
* `iterate.rs`: showcases iteration over the sysctl tree
Run with:
```sh
$ cargo run --example iterate
```
Or to use in your program:
```rust
extern crate sysctl;
use sysctl::Sysctl;
fn main() {
let ctl = sysctl::Ctl::new("kern.osrevision").unwrap();
println!("Description: {}", ctl.description().unwrap());
println!("Value: {}", ctl.value_string().unwrap());
}
```
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