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-rw-r--r--win32/win32.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/win32/win32.c b/win32/win32.c
index 1a532c6c7c..36335f144f 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -2584,6 +2584,18 @@ set_pioinfo_extra(void)
# define UCRTBASE "ucrtbase.dll"
# endif
/* get __pioinfo addr with _isatty */
+ /*
+ * Why Ruby depends to _pioinfo is
+ * * to associate socket and fd: CRuby creates fd with dummy file handle
+ * and set socket to emulate Unix-like behavior. Without __pioinfo
+ * we need something which manages the fd number allocation
+ * * to implement overlapped I/O for Windows 2000/XP
+ * * to emulate fcntl(2)
+ *
+ * see also
+ * * https://bugs.ruby-lang.org/issues/11118
+ * * https://bugs.ruby-lang.org/issues/18605
+ */
char *p = (char*)get_proc_address(UCRTBASE, "_isatty", NULL);
char *pend = p;
/* _osfile(fh) & FDEV */