add ucred(3C) support for illumos and Solaris systems

This series of routines allows the caller to determine the credentials
of another process by pid, or of the process on the remote end of a UNIX
domain socket.  The ucred_t is an opaque object with accessor routines,
and must be freed through ucred_free(3C) after use.

Author: jclulow

src/unix/solarish/mod.rs

@@ -22,6 +22,8 @@ pub type tcflag_t = ::c_uint;
 pub type time_t = ::c_long;
 pub type wchar_t = ::c_int;
 pub type nfds_t = ::c_ulong;
+pub type projid_t = ::c_int;
+pub type zoneid_t = ::c_int;
 
 pub type suseconds_t = ::c_long;
 pub type off_t = ::c_long;
@@ -46,6 +48,15 @@ impl ::Clone for timezone {
     }
 }
 
+#[cfg_attr(feature = "extra_traits", derive(Debug))]
+pub enum ucred_t {}
+impl ::Copy for ucred_t {}
+impl ::Clone for ucred_t {
+    fn clone(&self) -> ucred_t {
+        *self
+    }
+}
+
 s! {
     pub struct in_addr {
         pub s_addr: ::in_addr_t,
@@ -2582,6 +2593,28 @@ extern "C" {
 
     pub fn ntp_adjtime(buf: *mut timex) -> ::c_int;
     pub fn ntp_gettime(buf: *mut ntptimeval) -> ::c_int;
+
+    pub fn ucred_get(pid: ::pid_t) -> *mut ucred_t;
+    pub fn getpeerucred(fd: ::c_int, ucred: *mut *mut ucred_t) -> ::c_int;
+
+    pub fn ucred_free(ucred: *mut ucred_t);
+
+    pub fn ucred_geteuid(ucred: *const ucred_t) -> ::uid_t;
+    pub fn ucred_getruid(ucred: *const ucred_t) -> ::uid_t;
+    pub fn ucred_getsuid(ucred: *const ucred_t) -> ::uid_t;
+    pub fn ucred_getegid(ucred: *const ucred_t) -> ::gid_t;
+    pub fn ucred_getrgid(ucred: *const ucred_t) -> ::gid_t;
+    pub fn ucred_getsgid(ucred: *const ucred_t) -> ::gid_t;
+    pub fn ucred_getgroups(
+        ucred: *const ucred_t,
+        groups: *mut *const ::gid_t,
+    ) -> ::c_int;
+    pub fn ucred_getpid(ucred: *const ucred_t) -> ::pid_t;
+    pub fn ucred_getprojid(ucred: *const ucred_t) -> projid_t;
+    pub fn ucred_getzoneid(ucred: *const ucred_t) -> zoneid_t;
+    pub fn ucred_getpflags(ucred: *const ucred_t, flags: ::c_uint) -> ::c_uint;
+
+    pub fn ucred_size() -> ::size_t;
 }
 
 mod compat;