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-rw-r--r--stdlib/stdlib.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index e741f492c6..9e08d81c77 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -265,6 +265,12 @@ extern int rand __P ((void));
/* Seed the random number generator with the given number. */
extern void srand __P ((unsigned int __seed));
+#ifdef __USE_REENTRANT
+/* Reentrant interface according to POSIX.1. */
+extern int __rand_r __P ((unsigned int *__seed));
+extern int rand_r __P ((unsigned int *__seed));
+#endif
+
#if defined(__USE_SVID) || defined(__USE_XOPEN)
/* System V style 48-bit random number generator functions. */