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-rw-r--r--posix/unistd.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 744c10c50b..d6cd152b46 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -734,7 +734,7 @@ extern int ttyslot (void) __THROW;
extern int link (__const char *__from, __const char *__to)
__THROW __nonnull ((1, 2)) __wur;
-#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
/* Make a symbolic link to FROM named TO. */
extern int symlink (__const char *__from, __const char *__to)
__THROW __nonnull ((1, 2)) __wur;
@@ -1046,6 +1046,12 @@ extern void swab (__const void *__restrict __from, void *__restrict __to,
extern char *ctermid (char *__s) __THROW __nonnull ((1));
#endif
+
+/* Define some macros helping to catch buffer overflows. */
+#if __USE_FORTIFY_LEVEL > 0 && !defined __cplusplus
+# include <bits/unistd.h>
+#endif
+
__END_DECLS
#endif /* unistd.h */