Use a constant in utsname

Author: mneumann

src/unix/bsd/mod.rs

@@ -10,6 +10,11 @@ pub type sa_family_t = u8;
 pub type pthread_t = ::uintptr_t;
 pub type nfds_t = ::c_uint;
 
+#[cfg(not(target_os = "dragonfly"))]
+const UTSNAME_LEN: usize = 256;
+#[cfg(target_os = "dragonfly")]
+const UTSNAME_LEN: usize = 32;
+
 s! {
     pub struct sockaddr {
         pub sa_len: u8,
@@ -85,26 +90,11 @@ s! {
     }
 
     pub struct utsname {
-        #[cfg(not(target_os = "dragonfly"))]
-        pub sysname: [::c_char; 256],
-        #[cfg(target_os = "dragonfly")]
-        pub sysname: [::c_char; 32],
-        #[cfg(not(target_os = "dragonfly"))]
-        pub nodename: [::c_char; 256],
-        #[cfg(target_os = "dragonfly")]
-        pub nodename: [::c_char; 32],
-        #[cfg(not(target_os = "dragonfly"))]
-        pub release: [::c_char; 256],
-        #[cfg(target_os = "dragonfly")]
-        pub release: [::c_char; 32],
-        #[cfg(not(target_os = "dragonfly"))]
-        pub version: [::c_char; 256],
-        #[cfg(target_os = "dragonfly")]
-        pub version: [::c_char; 32],
-        #[cfg(not(target_os = "dragonfly"))]
-        pub machine: [::c_char; 256],
-        #[cfg(target_os = "dragonfly")]
-        pub machine: [::c_char; 32],
+        pub sysname: [::c_char; UTSNAME_LEN],
+        pub nodename: [::c_char; UTSNAME_LEN],
+        pub release: [::c_char; UTSNAME_LEN],
+        pub version: [::c_char; UTSNAME_LEN],
+        pub machine: [::c_char; UTSNAME_LEN],
     }
 
     pub struct msghdr {