Expose EPOLLEXCLUSIVE on illumos platform

Initially the EPOLLEXCLUSIVE definition was hidden on the illumos
platform as it lacked explicit support.  After further review, it was
concluded that EPOLLEXCLUSIVE can safely be considered a no-op, when not
fully implemented by the OS, making it safe for use on illumos.

Author: pfmooney

libc-test/build.rs

@@ -794,6 +794,11 @@ fn test_solarish(target: &str) {
         // This evaluates to a sysconf() call rather than a constant
         "PTHREAD_STACK_MIN" => true,
 
+        // EPOLLEXCLUSIVE is a relatively recent addition to the epoll interface and may not be
+        // defined on older systems.  It is, however, safe to use on systems which do not
+        // explicitly support it. (A no-op is an acceptable implementation of EPOLLEXCLUSIVE.)
+        "EPOLLEXCLUSIVE" => true,
+
         _ => false,
     });
 

src/unix/solarish/mod.rs

@@ -1838,6 +1838,7 @@ pub const EPOLLET: ::c_int = 0x80000000;
 pub const EPOLLRDHUP: ::c_int = 0x2000;
 pub const EPOLLONESHOT: ::c_int = 0x40000000;
 pub const EPOLLWAKEUP: ::c_int = 0x20000000;
+pub const EPOLLEXCLUSIVE: ::c_int = 0x10000000;
 pub const EPOLL_CLOEXEC: ::c_int = 0x80000;
 pub const EPOLL_CTL_ADD: ::c_int = 1;
 pub const EPOLL_CTL_MOD: ::c_int = 3;

src/unix/solarish/solaris.rs

@@ -29,8 +29,6 @@ s! {
 pub const PORT_SOURCE_POSTWAIT: ::c_int = 8;
 pub const PORT_SOURCE_SIGNAL: ::c_int = 9;
 
-pub const EPOLLEXCLUSIVE: ::c_int = 0x10000000;
-
 pub const AF_LOCAL: ::c_int = 0;
 pub const AF_FILE: ::c_int = 0;