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13a84ac79b
This patch replaces ctty constants with more descriptive macros (CTTY_UNINITIALIZED and CTTY_RELEASED) rather than -1 and -2 as well as checking sign with CTTY_IS_VALID(). Fixes: 3b7df69aaa57 (Cygwin: ctty: Add comments for the special values: -1 and -2.) Suggested-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>