Only try to bump ulimit on Linux due to MacOS issues

See #78

Cargo.toml

@@ -50,4 +50,6 @@ dirs-next = "2.0"
 
 [target."cfg(unix)".dependencies]
 termios = "0.3"
+
+[target.'cfg(target_os="linux")'.dependencies]
 rlimit = "0.5"

src/lib.rs

@@ -17,6 +17,6 @@ pub mod runtime;
 pub mod scheduler;
 pub mod sockets;
 pub mod structs;
-#[cfg(unix)]
+#[cfg(target_os="linux")]
 pub mod ulimit;
 pub mod utils;

src/main.rs

@@ -171,7 +171,7 @@ fn main() -> Result<()> {
     }
 
     let config = Arc::new(Config::load()?);
-    #[cfg(unix)]
+    #[cfg(target_os="linux")]
     badtouch::ulimit::set_nofile(&config)
         .context("Failed to set RLIMIT_NOFILE")?;