feat(sys): import types from libc

The change introduces an optional feature nginx-sys/libc that replaces
some generated types with corresponding imports from "libc".

Author: bavshin-f5

Cargo.lock

@@ -37,6 +37,9 @@ lock_api = "0.4.13"
 nginx-sys = { path = "nginx-sys", default-features=false, version = "0.5.0"}
 pin-project-lite = { version = "0.2.16", optional = true }
 
+[workspace.dependencies]
+libc = { version = "0.2.174", default-features = false }
+
 [features]
 default = ["std"]
 async = [

Cargo.toml

@@ -22,7 +22,7 @@ chrono = "0.4.23"
 http = "1.1.0"
 # use unicode-rs idna backend for lower MSRV and faster builds
 idna_adapter = "=1.1.0"
-libc = "0.2.140"
+libc.workspace = true
 tokio = { version = "1.33.0", features = ["full"] }
 
 [[example]]

examples/Cargo.toml

@@ -20,6 +20,7 @@ default-target = "x86_64-unknown-linux-gnu"
 targets = []
 
 [dependencies]
+libc = { optional = true, workspace = true }
 openssl-sys = { version = "0.9.109", optional = true }
 
 [target.'cfg(not(windows))'.dependencies]
@@ -34,6 +35,8 @@ regex = "1.11.1"
 nginx-src = { version = "~1.28.0", optional = true, path = "../nginx-src" }
 
 [features]
+# Reexport types from "libc" instead of generating our own bindings.
+libc = ["dep:libc"]
 # Reexport types from "openssl-sys" instead of generating our own bindings.
 # Note that openssl-sys depends on "std".
 openssl-sys = ["dep:openssl-sys"]

nginx-sys/Cargo.toml

@@ -250,18 +250,57 @@ fn generate_binding(nginx: &NginxSource) {
         .rust_target(rust_target)
         .use_core();
 
-    if cfg!(feature = "openssl-sys") {
+    if cfg!(any(feature = "libc", feature = "openssl-sys")) {
         use bindgen_callbacks::TypeFlags as TF;
 
         let mut callbacks = bindgen_callbacks::NgxBindgenCallbacks::new();
-        callbacks.add_external_types(
-            "openssl_sys",
-            [
-                ("SSL", TF::empty()),
-                ("SSL_CTX", TF::empty()),
-                ("SSL_SESSION", TF::empty()),
-            ],
-        );
+        if cfg!(feature = "libc") {
+            callbacks.add_external_types(
+                "libc",
+                [
+                    ("glob_t", TF::COPY),
+                    ("in6_addr", TF::COPY),
+                    ("iocb", TF::COPY),
+                    ("sem_t", TF::COPY),
+                    ("sockaddr_in", TF::COPY),
+                    ("sockaddr_in6", TF::COPY),
+                    ("stat", TF::COPY),
+                    ("DIR", TF::COPY | TF::DEBUG),
+                    ("cmsghdr", TF::COPY | TF::DEBUG),
+                    ("cpu_set_t", TF::COPY | TF::DEBUG),
+                    ("dirent", TF::COPY | TF::DEBUG),
+                    ("gid_t", TF::COPY | TF::DEBUG),
+                    ("in6_pktinfo", TF::COPY | TF::DEBUG),
+                    ("in_addr_t", TF::COPY | TF::DEBUG),
+                    ("in_pktinfo", TF::COPY | TF::DEBUG),
+                    ("in_port_t", TF::COPY | TF::DEBUG),
+                    ("ino_t", TF::COPY | TF::DEBUG),
+                    ("iovec", TF::COPY | TF::DEBUG),
+                    ("msghdr", TF::COPY | TF::DEBUG),
+                    ("off_t", TF::COPY | TF::DEBUG),
+                    ("pid_t", TF::COPY | TF::DEBUG),
+                    ("pthread_cond_t", TF::COPY | TF::DEBUG),
+                    ("pthread_mutex_t", TF::COPY | TF::DEBUG),
+                    ("sockaddr", TF::COPY | TF::DEBUG),
+                    ("sockaddr_un", TF::COPY | TF::DEBUG),
+                    ("socklen_t", TF::COPY | TF::DEBUG),
+                    ("time_t", TF::COPY | TF::DEBUG),
+                    ("tm", TF::COPY | TF::DEBUG),
+                    ("uid_t", TF::COPY | TF::DEBUG),
+                ],
+            );
+        }
+
+        if cfg!(feature = "openssl-sys") {
+            callbacks.add_external_types(
+                "openssl_sys",
+                [
+                    ("SSL", TF::empty()),
+                    ("SSL_CTX", TF::empty()),
+                    ("SSL_SESSION", TF::empty()),
+                ],
+            )
+        }
 
         bindings = callbacks.add_to_builder(bindings);
     }