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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>