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-rw-r--r--posix/unistd.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index f14e02d02b..2fbdae5652 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -77,6 +77,9 @@ __BEGIN_DECLS
are present. */
#define _XOPEN_ENH_I18N 1
+/* The legacy interfaces are also available. */
+#define _XOPEN_LEGACY 1
+
/* Get values of POSIX options:
@@ -122,6 +125,8 @@ __BEGIN_DECLS
_POSIX_POLL Implementation supports `poll' function.
_POSIX_SELECT Implementation supports `select' and `pselect'.
+ _XOPEN_REALTIME X/Open realtime support is available.
+ _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
_XOPEN_SHM Shared memory interface according to XPG4.2.
_XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
@@ -162,6 +167,10 @@ __BEGIN_DECLS
#include <bits/posix_opt.h>
+/* Get the environment definitions from Unix98. */
+#ifdef __USE_UNIX98
+# include <bits/environments.h>
+#endif
/* Standard file descriptors. */
#define STDIN_FILENO 0 /* Standard input. */