3 files changed, 4 insertions, 8 deletions
diff --git a/include/ruby/internal/intern/select/largesize.h b/include/ruby/internal/intern/select/largesize.h
index d156f62034..d65f088c06 100644
--- a/include/ruby/internal/intern/select/largesize.h
+++ b/include/ruby/internal/intern/select/largesize.h
@@ -35,9 +35,6 @@
  *   `select(2)` documents how to allocate fd_set dynamically.
  *   http://www.openbsd.org/cgi-bin/man.cgi?query=select&manpath=OpenBSD+4.4
  *
- * - HP-UX documents how to allocate fd_set dynamically.
- *   http://docs.hp.com/en/B2355-60105/select.2.html
- *
  * - Solaris 8 has `select_large_fdset`
  *
  * - Mac OS X 10.7 (Lion)
diff --git a/include/ruby/internal/intern/select/posix.h b/include/ruby/internal/intern/select/posix.h
index bfde159890..0a9b0b2e51 100644
--- a/include/ruby/internal/intern/select/posix.h
+++ b/include/ruby/internal/intern/select/posix.h
@@ -95,11 +95,10 @@ RBIMPL_ATTR_NOALIAS()
  *
  * @param[out]  dst   Target fdset.
  * @param[in]   src   Source fdset.
- * @param[in]   n     Unused parameter.
  * @post        `dst` is a copy of `src`.
  */
 static inline void
-rb_fd_dup(rb_fdset_t *dst, const fd_set *src, int n)
+rb_fd_dup(rb_fdset_t *dst, const fd_set *src)
 {
     *dst = *src;
 }
@@ -137,7 +136,7 @@ rb_fd_max(const rb_fdset_t *f)
 }
 
 /** @cond INTERNAL_MACRO */
-/* :FIXME: What are these?  They don't exist for shibling implementations. */
+/* :FIXME: What are these?  They don't exist for sibling implementations. */
 #define rb_fd_init_copy(d, s) (*(d) = *(s))
 #define rb_fd_term(f)   ((void)(f))
 /** @endcond */
diff --git a/include/ruby/internal/intern/select/win32.h b/include/ruby/internal/intern/select/win32.h
index edaf7a8523..b7301e63f3 100644
--- a/include/ruby/internal/intern/select/win32.h
+++ b/include/ruby/internal/intern/select/win32.h
@@ -206,7 +206,7 @@ rb_fd_dup(rb_fdset_t *dst, const rb_fdset_t *src)
  * property  we heavily  touch  the  internals of  MSVCRT.   We `CreateFile`  a
  * `"NUL"` alongside of  a socket and directly manipulate  its `struct ioinfo`.
  * This is of  course a very dirty hack.   If we could design the  API today we
- * could use `CancellIoEx`.  But we are older than that Win32 API.
+ * could use `CancelIoEx`.  But we are older than that Win32 API.
  */
 static inline int
 rb_fd_select(int n, rb_fdset_t *rfds, rb_fdset_t *wfds, rb_fdset_t *efds, struct timeval *timeout)
@@ -253,7 +253,7 @@ rb_fd_max(const rb_fdset_t *f)
     const fd_set *p = f->fdset;
 
     RBIMPL_ASSERT_OR_ASSUME(p);
-    return p->fd_count;
+    return RBIMPL_CAST((int)p->fd_count);
 }
 
 #endif /* RBIMPL_INTERN_SELECT_WIN32_H */