feat(sys): import types from other -sys crates

Cargo.toml

@@ -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 = [

examples/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/httporigdst.rs

@@ -1,16 +1,17 @@
 use std::ffi::{c_int, c_void};
 use std::ptr::addr_of;
 
+use libc::sockaddr_storage;
 use ngx::core;
 use ngx::ffi::{
     in_port_t, ngx_conf_t, ngx_connection_local_sockaddr, ngx_http_add_variable, ngx_http_module_t,
     ngx_http_variable_t, ngx_inet_get_port, ngx_int_t, ngx_module_t, ngx_sock_ntop, ngx_str_t,
-    ngx_variable_value_t, sockaddr, sockaddr_storage, INET_ADDRSTRLEN, NGX_HTTP_MODULE,
+    ngx_variable_value_t, sockaddr, NGX_HTTP_MODULE,
 };
 use ngx::http::{self, HttpModule};
 use ngx::{http_variable_get, ngx_log_debug_http, ngx_string};
 
-const IPV4_STRLEN: usize = INET_ADDRSTRLEN as usize;
+const IPV4_STRLEN: usize = 16; // Not exported from `libc`
 
 #[derive(Debug, Default)]
 struct NgxHttpOrigDstCtx {

nginx-sys/Cargo.toml

@@ -20,16 +20,27 @@ default-target = "x86_64-unknown-linux-gnu"
 targets = []
 
 [dependencies]
+libc = { optional = true, workspace = true }
+openssl-sys = { version = "0.9.109", optional = true }
+pcre2-sys = { version = "0.2.9", optional = true }
 
 [target.'cfg(not(windows))'.dependencies]
 errno = { version = "0.3", default-features = false }
 
 [build-dependencies]
 bindgen = "0.71"
+bitflags = "2.9.1"
 cc = "1.2.0"
 dunce = "1.0.5"
 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"]
+# Reexport types from "pcre2-sys" instead of generating our own bindings.
+pcre2-sys = ["dep:pcre2-sys"]
 vendored = ["dep:nginx-src"]