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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 55d66a6d27..516f288f64 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 
 The GNU C Library is free software; you can redistribute it and/or
@@ -180,6 +180,12 @@ extern unsigned int alarm __P ((unsigned int __seconds));
    error, but if `sleep' returns SECONDS, it probably didn't work.  */
 extern unsigned int sleep __P ((unsigned int __seconds));
 
+#ifdef __USE_BSD
+/* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
+   or ignored.  Return value is not necessarily useful.  */
+extern unsigned int usleep __P ((unsigned __useconds));
+#endif
+
 
 /* Suspend the process until a signal arrives.
    This always returns -1 and sets `errno' to EINTR.  */