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-rw-r--r--win32/win32.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/win32/win32.c b/win32/win32.c
index b948fe0d77..ba8a96e82c 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -1836,6 +1836,15 @@ rb_w32_open_osfhandle(intptr_t osfhandle, int flags)
}
#endif
+int
+rb_w32_is_valid_fd(int fd)
+{
+ if (_get_osfhandle(fd) == -1)
+ return -1;
+ else
+ return 0;
+}
+
#undef getsockopt
static int