Move code to BSD mod

Author: darcyliu

src/unix/bsd/mod.rs

@@ -776,6 +776,20 @@ extern "C" {
         value: *mut ::c_void,
     ) -> ::c_int;
     pub fn acct(filename: *const ::c_char) -> ::c_int;
+    #[cfg_attr(
+        all(target_os = "macos", target_arch = "x86"),
+        link_name = "wait4$UNIX2003"
+    )]
+    #[cfg_attr(
+        all(target_os = "freebsd", any(freebsd12, freebsd11, freebsd10)),
+        link_name = "wait4@FBSD_1.0"
+    )]
+    pub fn wait4(
+        pid: ::pid_t,
+        status: *mut ::c_int,
+        options: ::c_int,
+        rusage: *mut ::rusage,
+    ) -> ::pid_t;
 }
 
 cfg_if! {

src/unix/mod.rs

@@ -921,20 +921,6 @@ extern "C" {
         link_name = "wait$UNIX2003"
     )]
     pub fn wait(status: *mut ::c_int) -> pid_t;
-    #[cfg_attr(
-         all(target_os = "macos", target_arch = "x86"),
-         link_name = "wait4$UNIX2003"
-     )]
-     #[cfg_attr(
-         all(target_os = "freebsd", any(freebsd11, freebsd10)),
-         link_name = "wait4@FBSD_1.0"
-     )]
-     pub fn wait4(
-         pid: ::pid_t,
-         status: *mut ::c_int,
-         options: ::c_int,
-         rusage: *mut ::rusage,
-     ) -> ::pid_t;
     #[cfg_attr(
         all(target_os = "macos", target_arch = "x86"),
         link_name = "waitpid$UNIX2003"