Allow multiple versions of the Cyclors library to be loaded simultaneously on Linux systems.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cyclors"
-version = "0.3.1"
+version = "0.3.2"
 authors = ["kydos <angelo@icorsaro.net>"]
 license = "Apache-2.0"
 readme = "README.md"

build.rs

@@ -1,7 +1,14 @@
 extern crate bindgen;
 
-use std::env;
-use std::path::PathBuf;
+#[allow(unused_imports)]
+use std::collections::HashSet;
+use std::fs::File;
+#[allow(unused_imports)]
+use std::io::{LineWriter, Write};
+use std::path::{Path, PathBuf};
+#[allow(unused_imports)]
+use std::process::Command;
+use std::{env, fs};
 
 fn main() {
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
@@ -143,17 +150,194 @@ fn main() {
         .clang_arg(format!("-I{}", cyclocut_include.to_str().unwrap()))
         .generate_comments(false);
 
+    #[allow(unused)]
+    let mut prefix = String::from("");
+
+    // Prefix symbols in Cyclone DDS and Cyclocut libraries to ensure uniqueness
+    #[cfg(all(target_os = "linux", not(feature = "iceoryx")))]
+    {
+        // Prefix = cyclors_<version>_
+        prefix = env::var("CARGO_PKG_VERSION").unwrap().replace('.', "_");
+        prefix.insert_str(0, "cyclors_");
+        prefix.push('_');
+
+        let mut symbols = HashSet::new();
+
+        let cyclone_symbols = get_defined_symbols(&cyclonedds_lib, "libddsc.a")
+            .expect("Failed to get symbols from libddsc.a!");
+        symbols.extend(cyclone_symbols);
+        prefix_symbols(&cyclonedds_lib, "libddsc.a", &prefix, &symbols).unwrap();
+
+        let cyclocut_symbols = get_defined_symbols(&cyclocut_lib, "libcdds-util.a")
+            .expect("Failed to get symbols from libcdds-util.a!");
+        symbols.extend(cyclocut_symbols);
+        prefix_symbols(&cyclocut_lib, "libcdds-util.a", &prefix, &symbols).unwrap();
+
+        #[derive(Debug)]
+        struct PrefixLinkNameCallback {
+            prefix: String,
+            symbols: HashSet<String>,
+        }
+
+        impl bindgen::callbacks::ParseCallbacks for PrefixLinkNameCallback {
+            fn generated_link_name_override(
+                &self,
+                item_info: bindgen::callbacks::ItemInfo<'_>,
+            ) -> Option<String> {
+                match self.symbols.contains(item_info.name) {
+                    true => {
+                        let mut prefix = self.prefix.clone();
+                        prefix.push_str(item_info.name);
+                        Some(prefix)
+                    }
+                    false => None,
+                }
+            }
+        }
+
+        bindings = bindings.parse_callbacks(Box::new(PrefixLinkNameCallback {
+            prefix: prefix.clone(),
+            symbols: symbols.clone(),
+        }));
+    }
+
     // Add *IMAGE_TLS_DIRECTORY* to blocklist on Windows due to
     // https://github.com/rust-lang/rust-bindgen/issues/2179
     #[cfg(target_os = "windows")]
     let bindings = bindings
         .clang_arg("-Wno-invalid-token-paste")
         .blocklist_type("^(.*IMAGE_TLS_DIRECTORY.*)$");
 
+    // Set link name prefix on additional wrapStringper functions
+    generate_template_src(&prefix, &out_dir).unwrap();
+
     // Generate bindings
     let bindings = bindings.generate().expect("Unable to generate bindings");
 
     bindings
         .write_to_file(out_dir.join("bindings.rs"))
         .expect("Couldn't write bindings!");
 }
+
+#[cfg(all(target_os = "linux", not(feature = "iceoryx")))]
+fn get_defined_symbols(lib_dir: &Path, lib_name: &str) -> Result<HashSet<String>, String> {
+    let lib_path = lib_dir.to_path_buf().join(lib_name);
+
+    let rc = Command::new("nm")
+        .arg("--defined-only")
+        .arg("--print-file-name")
+        .arg(lib_path)
+        .output();
+
+    match rc {
+        Ok(output) => {
+            let stdout = String::from_utf8_lossy(&output.stdout);
+            let stderr = String::from_utf8_lossy(&output.stderr);
+
+            match stderr.is_empty() {
+                true => {
+                    let mut result: HashSet<String> = HashSet::new();
+                    for line in stdout.lines() {
+                        let tokens: Vec<&str> = line.split_whitespace().collect();
+                        let symbol = *tokens.last().unwrap();
+                        result.insert(String::from(symbol));
+                    }
+                    Ok(result)
+                }
+                false => Err(format!(
+                    "Failed to run nm on library {} (stderr: {})",
+                    lib_name,
+                    String::from(stderr)
+                )),
+            }
+        }
+        Err(_) => Err(format!("Failed to run nm on library {}", lib_name)),
+    }
+}
+
+#[cfg(all(target_os = "linux", not(feature = "iceoryx")))]
+fn prefix_symbols(
+    lib_dir: &Path,
+    lib_name: &str,
+    prefix: &str,
+    symbols: &HashSet<String>,
+) -> Result<(), String> {
+    let mut objcopy_file_name = lib_name.to_owned();
+    objcopy_file_name.push_str(".objcopy");
+
+    let lib_file_path = lib_dir.to_path_buf().join(lib_name);
+    let symbol_file_path = lib_dir.to_path_buf().join(objcopy_file_name);
+
+    match File::create(symbol_file_path.clone()) {
+        Ok(symbol_file) => {
+            let mut symbol_file = LineWriter::new(symbol_file);
+
+            for symbol in symbols {
+                let mut symbol_arg = symbol.clone();
+                symbol_arg.push(' ');
+                symbol_arg.push_str(prefix);
+                symbol_arg.push_str(symbol);
+                symbol_arg.push('\n');
+                if symbol_file.write_all(symbol_arg.as_bytes()).is_err() {
+                    return Err(format!(
+                        "Failed to write symbol file for library {}",
+                        lib_name
+                    ));
+                }
+            }
+
+            if symbol_file.flush().is_err() {
+                return Err(format!(
+                    "Failed to write symbol file for library {}",
+                    lib_name
+                ));
+            }
+            let arg = format!("--redefine-syms={}", symbol_file_path.to_str().unwrap());
+            match Command::new("objcopy").arg(arg).arg(lib_file_path).output() {
+                Ok(_) => Ok(()),
+                Err(_) => Err(format!("Failed to run objcopy on library {}", lib_name)),
+            }
+        }
+        Err(_) => Err(format!(
+            "Failed to create symbol file for library {}",
+            lib_name
+        )),
+    }
+}
+
+fn generate_template_src(prefix: &str, out_dir: &Path) -> Result<(), String> {
+    let src_path = Path::new("src/functions.template");
+    let dst_path = out_dir.join("functions.rs");
+
+    match fs::read_to_string(src_path) {
+        Ok(mut contents) => {
+            contents = contents.replace("<prefix>", prefix);
+
+            match File::create(&dst_path) {
+                Ok(mut file) => {
+                    if file.write_all(contents.as_bytes()).is_err() {
+                        let path = dst_path.to_str().unwrap();
+                        return Err(format!(
+                            "Failed to write the modified content to the destination file {}",
+                            path
+                        ));
+                    }
+
+                    println!("cargo:rerun-if-changed=src/lib.rs");
+                    println!("cargo:rerun-if-changed=src/functions.template");
+                    Ok(())
+                }
+                Err(_) => {
+                    let path = dst_path.to_str().unwrap();
+                    Err(format!(
+                        "Failed to open the destination file ({}) for writing",
+                        path
+                    ))
+                }
+            }
+        }
+        Err(_) => Err(String::from(
+            "Failed to read the source file src/functions.template",
+        )),
+    }
+}

src/functions.template

@@ -0,0 +1,41 @@
+/* Additional wrapper functions for select exported inline functions */
+
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_size"]
+    pub fn ddsi_serdata_size(d: *const ddsi_serdata) -> u32;
+}
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_to_ser_ref"]
+    pub fn ddsi_serdata_to_ser_ref(
+        d: *const ddsi_serdata,
+        off: usize,
+        sz: usize,
+        ref_: *mut ddsrt_iovec_t,
+    ) -> *mut ddsi_serdata;
+}
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_unref"]
+    pub fn ddsi_serdata_unref(serdata: *mut ddsi_serdata);
+}
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_to_ser_unref"]
+    pub fn ddsi_serdata_to_ser_unref(d: *mut ddsi_serdata, ref_: *const ddsrt_iovec_t);
+}
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_from_ser_iov"]
+    pub fn ddsi_serdata_from_ser_iov(
+        type_: *const ddsi_sertype,
+        kind: ddsi_serdata_kind,
+        niov: ddsrt_msg_iovlen_t,
+        iov: *const ddsrt_iovec_t,
+        size: usize,
+    ) -> *mut ddsi_serdata;
+}
+extern "C" {
+    #[link_name = "<prefix>ddsi_serdata_from_sample"]
+    pub fn ddsi_serdata_from_sample(
+        type_: *const ddsi_sertype,
+        kind: ddsi_serdata_kind,
+        sample: *const ::std::os::raw::c_void,
+    ) -> *mut ddsi_serdata;
+}

src/lib.rs

@@ -48,38 +48,5 @@ mod bindings {
 }
 pub use bindings::*;
 
-/* Additional wrapper functions for select exported inline functions */
-
-extern "C" {
-    pub fn ddsi_serdata_size(d: *const ddsi_serdata) -> u32;
-}
-extern "C" {
-    pub fn ddsi_serdata_to_ser_ref(
-        d: *const ddsi_serdata,
-        off: usize,
-        sz: usize,
-        ref_: *mut ddsrt_iovec_t,
-    ) -> *mut ddsi_serdata;
-}
-extern "C" {
-    pub fn ddsi_serdata_unref(serdata: *mut ddsi_serdata);
-}
-extern "C" {
-    pub fn ddsi_serdata_to_ser_unref(d: *mut ddsi_serdata, ref_: *const ddsrt_iovec_t);
-}
-extern "C" {
-    pub fn ddsi_serdata_from_ser_iov(
-        type_: *const ddsi_sertype,
-        kind: ddsi_serdata_kind,
-        niov: ddsrt_msg_iovlen_t,
-        iov: *const ddsrt_iovec_t,
-        size: usize,
-    ) -> *mut ddsi_serdata;
-}
-extern "C" {
-    pub fn ddsi_serdata_from_sample(
-        type_: *const ddsi_sertype,
-        kind: ddsi_serdata_kind,
-        sample: *const ::std::os::raw::c_void,
-    ) -> *mut ddsi_serdata;
-}
+// Include the generated additional wrapper functions from OUT_DIR
+include!(concat!(env!("OUT_DIR"), "/functions.rs"));