radicle: Fix file limit setting for FreeBSD

On FreeBSD systems, the file limits are of type `i64` in comparison to
`u64` on Linux systems.

Also fix `rad web` command name on Windows and FreeBSD.

Co-authored-by: cloudhead <cloudhead@radicle.xyz>
Co-authored-by: Shawn Webb <shawn.webb@hardenedbsd.org>

radicle-httpd/src/commands/web.rs

@@ -192,6 +192,8 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
     }
 
     if options.open {
+        #[cfg(any(target_os = "freebsd", target_os = "windows"))]
+        let cmd_name = "echo";
         #[cfg(target_os = "macos")]
         let cmd_name = "open";
         #[cfg(target_os = "linux")]

radicle-node/src/main.rs

@@ -120,7 +120,7 @@ fn execute() -> anyhow::Result<()> {
         config.node.listen.clone()
     };
 
-    if let Err(e) = radicle::io::set_file_limit(config.node.limits.max_open_files as u64) {
+    if let Err(e) = radicle::io::set_file_limit(config.node.limits.max_open_files) {
         log::warn!(target: "node", "Unable to set process open file limit: {e}");
     }
 

radicle/src/io.rs

@@ -1,9 +1,25 @@
+use std::fmt;
 use std::io;
 
 use libc::{getrlimit, rlimit, setrlimit, RLIMIT_NOFILE};
 
+#[cfg(not(target_os = "freebsd"))]
+type Int = u64;
+#[cfg(target_os = "freebsd")]
+type Int = i64;
+
 /// Sets the open file limit to the given value, or the maximum allowed value.
-pub fn set_file_limit(n: u64) -> io::Result<u64> {
+pub fn set_file_limit<N>(n: N) -> io::Result<Int>
+where
+    N: Copy + fmt::Display,
+    Int: TryFrom<N>,
+{
+    let Ok(n) = Int::try_from(n) else {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            format!("invalid file limit '{n}'"),
+        ));
+    };
     let mut rlim = rlimit {
         rlim_cur: 0, // Initial soft limit value
         rlim_max: 0, // Initial hard limit value