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-rw-r--r--posix/unistd.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 6818699104..b48f24b389 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -30,8 +30,9 @@ __BEGIN_DECLS
 /* These may be used to determine what facilities are present at compile time.
    Their values can be obtained at run time from sysconf.  */
 
-/* POSIX Standard approved as IEEE Std 1003.1 as of August, 1988.  */
-#define	_POSIX_VERSION	199009L
+/* POSIX Standard approved as IEEE Std 1003.1 as of August, 1988 and
+   extended by P1003.1b (aka POSIX.4).  */
+#define	_POSIX_VERSION	199309L
 
 /* These are not #ifdef __USE_POSIX2 because they are
    in the theoretically application-owned namespace.  */
@@ -94,6 +95,9 @@ __BEGIN_DECLS
 				`c_cc' member of `struct termios' is
 				_POSIX_VDISABLE, no character will have the
 				effect associated with that element.
+   _POSIX_SYNC_IO		Synchronous I/O may be performed.
+   _POSIX_ASYNC_IO		Asynchronous I/O may be performed.
+   _POSIX_PRIO_IO		Prioritized Asynchronous I/O may be performed.
    */
 
 #include <posix_opt.h>