Use libc::c_int

Author: Thomasdezeeuw

Cargo.toml

@@ -70,6 +70,8 @@ all = []
 [package.metadata.cargo_check_external_types]
 allowed_external_types = [
   # Referenced via a type alias.
+  "libc::c_int",
+  "libc::primitives::c_int", # libc::c_int isn't always detected.
   "libc::socklen_t",
   "libc::unix::bsd::socklen_t", # libc::socklen_t isn't always detected.
   "libc::sa_family_t",

src/sys/unix.rs

@@ -83,7 +83,7 @@ use crate::{Domain, Protocol, SockAddr, SockAddrStorage, TcpKeepalive, Type};
 #[cfg(not(target_os = "redox"))]
 use crate::{MsgHdr, MsgHdrMut, RecvFlags};
 
-pub(crate) use std::ffi::c_int;
+pub(crate) use libc::c_int;
 
 // Used in `Domain`.
 pub(crate) use libc::{AF_INET, AF_INET6, AF_UNIX};