1 files changed, 11 insertions, 0 deletions
diff --git a/lib/libc/gen/termios.c b/lib/libc/gen/termios.c
index 333dff4..4c6dcff 100644
--- a/lib/libc/gen/termios.c
+++ b/lib/libc/gen/termios.c
@@ -99,6 +99,17 @@ tcgetpgrp(fd)
 	return ((pid_t)s);
 }
 
+pid_t
+tcgetsid(int fd)
+{
+	int s;
+
+	if (_ioctl(fd, TIOCGSID, &s) < 0)
+		return ((pid_t)-1);
+
+	return ((pid_t)s);
+}
+
 speed_t
 cfgetospeed(t)
 	const struct termios *t;