add illumos support to v0.1

illumos forked from Solaris around a decade ago, but is also currently
without the "tm_gmtoff" member.

Cargo.toml

@@ -12,7 +12,7 @@ Utilities for working with time-related functions in Rust.
 """
 
 [dependencies]
-libc = "0.2.55"
+libc = "0.2.69"
 rustc-serialize = { version = "0.3", optional = true }
 
 [target.'cfg(windows)'.dependencies]

src/sys.rs

@@ -221,7 +221,7 @@ mod inner {
     #[cfg(all(not(target_os = "macos"), not(target_os = "ios")))]
     pub use self::unix::*;
 
-    #[cfg(target_os = "solaris")]
+    #[cfg(any(target_os = "solaris", target_os = "illumos"))]
     extern {
         static timezone: time_t;
         static altzone: time_t;
@@ -252,7 +252,7 @@ mod inner {
         rust_tm.tm_utcoff = utcoff;
     }
 
-    #[cfg(any(target_os = "nacl", target_os = "solaris"))]
+    #[cfg(any(target_os = "nacl", target_os = "solaris", target_os = "illumos"))]
     unsafe fn timegm(tm: *mut libc::tm) -> time_t {
         use std::env::{set_var, var_os, remove_var};
         extern {
@@ -295,7 +295,7 @@ mod inner {
             if libc::localtime_r(&sec, &mut out).is_null() {
                 panic!("localtime_r failed: {}", io::Error::last_os_error());
             }
-            #[cfg(target_os = "solaris")]
+            #[cfg(any(target_os = "solaris", target_os = "illumos"))]
             let gmtoff = {
                 ::tzset();
                 // < 0 means we don't know; assume we're not in DST.
@@ -308,7 +308,7 @@ mod inner {
                     -timezone
                 }
             };
-            #[cfg(not(target_os = "solaris"))]
+            #[cfg(not(any(target_os = "solaris", target_os = "illumos")))]
             let gmtoff = out.tm_gmtoff;
             tm_to_rust_tm(&out, gmtoff as i32, tm);
         }
@@ -317,7 +317,7 @@ mod inner {
     pub fn utc_tm_to_time(rust_tm: &Tm) -> i64 {
         #[cfg(all(target_os = "android", target_pointer_width = "32"))]
         use libc::timegm64 as timegm;
-        #[cfg(not(any(all(target_os = "android", target_pointer_width = "32"), target_os = "nacl", target_os = "solaris")))]
+        #[cfg(not(any(all(target_os = "android", target_pointer_width = "32"), target_os = "nacl", target_os = "solaris", target_os = "illumos")))]
         use libc::timegm;
 
         let mut tm = unsafe { mem::zeroed() };