chore: remove nix dependency

CHANGELOG.md

@@ -3,6 +3,7 @@
 # [?.?.?] Unreleased
 
 ### Added
+- util::errno function for getting errno
 
 ### Changed
 

tarantool/Cargo.toml

 [package]
 name = "tarantool"
 description = "Tarantool rust bindings"
-version = "3.0.2"
+version = "3.1.0"
 authors = [
     "Dmitriy Koltsov <dkoltsov@picodata.io>",
     "Georgy Moshkin <gmoshkin@picodata.io>",
@@ -25,9 +25,8 @@ clap = {version = "3", features = ["derive", "env"]}
 dlopen = "0.1.8"
 dec = "0.4.8"
 thiserror = "1.0.30"
-libc = "0.2"
+libc = { version = "0.2", features = ["extra_traits"] }
 log = "0.4"
-nix = "0.24.1"
 num-traits = "0.2"
 num-derive = "0.3"
 once_cell = "1.4.0"

tarantool/src/lib.rs

@@ -3,6 +3,7 @@
 #![allow(clippy::needless_return)]
 #![allow(clippy::redundant_closure_call)]
 #![allow(clippy::len_without_is_empty)]
+#![allow(clippy::unnecessary_cast)]
 //! Tarantool C API bindings for Rust.
 //! This library contains the following Tarantool API's:
 //!

tarantool/src/trigger.rs

 use crate::error::{TarantoolError, TarantoolErrorCode};
 use crate::ffi::tarantool as ffi;
 use crate::set_error;
-
-use nix::errno;
+use crate::util::errno;
 
 /// Set a callback to be called on Tarantool shutdown.
 pub fn on_shutdown<F: FnOnce() + 'static>(cb: F) -> Result<(), TarantoolError> {
     let cb_ptr = Box::into_raw(Box::new(cb));
     if unsafe { ffi::box_on_shutdown(cb_ptr as _, Some(trampoline::<F>), None) } != 0 {
-        if errno::from_i32(errno::errno()) == errno::Errno::EINVAL {
+        if errno() == libc::EINVAL {
             set_error!(
                 TarantoolErrorCode::IllegalParams,
                 "invalid arguments to on_shutdown"

tarantool/src/util.rs

@@ -159,6 +159,20 @@ macro_rules! unwrap_ok_or {
     }
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// errno
+////////////////////////////////////////////////////////////////////////////////
+
+#[inline(always)]
+#[rustfmt::skip]
+pub fn errno() -> i32 {
+    #[cfg(any(target_os = "freebsd", target_os = "macos"))]
+    unsafe { *libc::__errno() as i32 }
+
+    #[cfg(target_os = "linux")]
+    unsafe { *libc::__errno_location() as i32 }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // DisplayAsHexBytes
 ////////////////////////////////////////////////////////////////////////////////

tlua/src/lib.rs

@@ -3,6 +3,7 @@
 #![allow(clippy::needless_return)]
 #![allow(clippy::redundant_closure_call)]
 #![allow(clippy::len_without_is_empty)]
+#![allow(clippy::unnecessary_cast)]
 //! High-level zero-cost bindings for Lua (fork of
 //! [hlua](https://crates.io/crates/hlua))
 //!