Update nix dependency to 0.27

Update the nix dependency that we depend on to 0.27, to minimize the
chance of copies of multiple versions being pulled in during the build.

Signed-off-by: Daniel Müller <deso@posteo.net>

examples/bpf_query/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 libbpf-rs = { path = "../../libbpf-rs" }
-nix = { version = "0.26", default-features = false, features = ["net", "user"] }
+nix = { version = "0.27", default-features = false, features = ["net", "user"] }
 clap = { version = "4.0.32", default-features = false, features = ["std", "derive", "help", "usage"] }
 
 [target.'cfg(target_arch = "x86_64")'.dependencies]

examples/tc_port_whitelist/Cargo.toml

@@ -10,7 +10,7 @@ anyhow = "1.0"
 libbpf-rs = { path = "../../libbpf-rs" }
 libc = "0.2"
 plain = "0.2"
-nix = { version = "0.26", default-features = false, features = ["net", "user"] }
+nix = { version = "0.27", default-features = false, features = ["net", "user"] }
 clap = { version = "4.0.32", default-features = false, features = ["std", "derive", "help", "usage"] }
 
 [build-dependencies]

examples/tproxy/Cargo.toml

@@ -13,7 +13,7 @@ anyhow = "1.0"
 clap = { version = "4.0.32", default-features = false, features = ["std", "derive", "help", "usage"] }
 ctrlc = "3.2"
 libbpf-rs = { path = "../../libbpf-rs" }
-nix = { version = "0.26", default-features = false, features = ["net", "user"] }
+nix = { version = "0.27", default-features = false, features = ["net", "user"] }
 
 [build-dependencies]
 libbpf-cargo = { path = "../../libbpf-cargo" }

examples/tproxy/src/bin/proxy.rs

@@ -1,6 +1,6 @@
 use std::net::TcpListener;
 use std::net::TcpStream;
-use std::os::unix::io::FromRawFd;
+use std::os::unix::io::AsRawFd as _;
 use std::str::FromStr;
 
 use anyhow::Context;
@@ -56,17 +56,17 @@ fn main() -> Result<()> {
     .context("Failed to create listener socket")?;
 
     // Set some sockopts
-    setsockopt(fd, ReuseAddr, &true).context("Failed to set SO_REUSEADDR")?;
-    setsockopt(fd, IpTransparent, &true).context("Failed to set IP_TRANSPARENT")?;
+    setsockopt(&fd, ReuseAddr, &true).context("Failed to set SO_REUSEADDR")?;
+    setsockopt(&fd, IpTransparent, &true).context("Failed to set IP_TRANSPARENT")?;
 
     // Bind to addr
     let addr = format!("{}:{}", opts.addr, opts.port);
     let addr = SockaddrIn::from_str(&addr).context("Failed to parse socketaddr")?;
-    bind(fd, &addr).context("Failed to bind listener")?;
+    bind(fd.as_raw_fd(), &addr).context("Failed to bind listener")?;
 
     // Start listening
-    listen(fd, 128).context("Failed to listen")?;
-    let listener = unsafe { TcpListener::from_raw_fd(fd) };
+    listen(&fd, 128).context("Failed to listen")?;
+    let listener = TcpListener::from(fd);
 
     for client in listener.incoming() {
         let client = client.context("Failed to connect to client")?;

libbpf-rs/Cargo.toml

@@ -25,7 +25,7 @@ bitflags = "2.0"
 lazy_static = "1.4"
 libbpf-sys = { version = "1.0.3" }
 libc = "0.2"
-nix = { version = "0.26", default-features = false, features = ["net", "user"] }
+nix = { version = "0.27", default-features = false, features = ["net", "user"] }
 num_enum = "0.5"
 strum_macros = "0.24"
 thiserror = "1.0.10"