From cdf0f53f8ba0e79dedb83c626851597bacec53ca Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 9 Jul 2013 00:42:09 -0400
Subject: [PATCH] fix fd leak on races and cancellation in ctermid

---
 src/unistd/ctermid.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/unistd/ctermid.c b/src/unistd/ctermid.c
index 21b44ec8..c238905a 100644
--- a/src/unistd/ctermid.c
+++ b/src/unistd/ctermid.c
@@ -4,6 +4,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <limits.h>
+#include "syscall.h"
 
 char *ctermid(char *s)
 {
@@ -13,11 +14,11 @@ char *ctermid(char *s)
 		if (!s2) s2 = malloc(L_ctermid);
 		s = s2;
 	}
-	fd = open("/dev/tty", O_WRONLY | O_NOCTTY);
+	fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
 	if (fd < 0)
 		return strcpy(s, "");
 	if (ttyname_r(fd, s, L_ctermid))
 		strcpy(s, "");
-	close(fd);
+	__syscall(SYS_close, fd);
 	return s;
 }
-- 
2.25.1