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-rw-r--r--include/ruby/intern.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index c66064f8be..efb2814e6f 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -270,6 +270,7 @@ void rb_fd_set(int, rb_fdset_t *);
#define rb_fd_clr(n, f) rb_w32_fdclr((n), (f)->fdset)
#define rb_fd_isset(n, f) rb_w32_fdisset((n), (f)->fdset)
#define rb_fd_copy(d, s) rb_w32_fdcopy((d), (s))
+void rb_w32_fdcopy(rb_fdset_t *dst, const rb_fdset_t *src);
#define rb_fd_select(n, rfds, wfds, efds, timeout) rb_w32_select((n), (rfds) ? ((rb_fdset_t*)(rfds))->fdset : NULL, (wfds) ? ((rb_fdset_t*)(wfds))->fdset : NULL, (efds) ? ((rb_fdset_t*)(efds))->fdset: NULL, (timeout))
#define rb_fd_resize(n, f) ((void)(f))