getifs 0.4.0

A high-performance, cross-platform Rust library providing comprehensive network interface information without relying on libc's `getifaddrs`. Get interfaces, multicast addresses, local/private/public IP addresses, MTU, and gateway information with minimal overhead.
Documentation 
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use std::env::var;

fn main() {
  // Don't rerun this on changes other than build.rs, as we only depend on
  // the rustc version.
  println!("cargo:rerun-if-changed=build.rs");

  // Gather target information.
  let os = var("CARGO_CFG_TARGET_OS").unwrap();

  // Rust's libc crate groups some OS's together which have similar APIs;
  // create similarly-named features to make `cfg` tests more concise.
  let freebsdlike = os == "freebsd" || os == "dragonfly";
  if freebsdlike {
    use_feature("freebsdlike");
  }
  let netbsdlike = os == "openbsd" || os == "netbsd";
  if netbsdlike {
    use_feature("netbsdlike");
  }
  let apple = os == "macos" || os == "ios" || os == "tvos" || os == "visionos" || os == "watchos";
  if apple {
    use_feature("apple");
  }
  if os == "linux" || os == "l4re" || os == "android" || os == "emscripten" {
    use_feature("linux_like");
  }
  if apple || freebsdlike || netbsdlike {
    use_feature("bsd_like");
  }
}

fn use_feature(feature: &str) {
  println!("cargo:rustc-cfg={feature}");
}