1 files changed, 84 insertions, 0 deletions
diff --git a/newlib/libc/sys/sysvi386/tcline.c b/newlib/libc/sys/sysvi386/tcline.c
new file mode 100644
index 00000000000..39d4699e013
--- /dev/null
+++ b/newlib/libc/sys/sysvi386/tcline.c
@@ -0,0 +1,84 @@
+#define _NO_MACROS
+#include <sys/unistd.h>
+#include <sys/termios.h>
+#include <errno.h>
+
+int
+tcsendbreak (int fd, int dur) {
+	do {
+		if (_ioctl (fd, _TCSBRK, 0) == -1)
+			return -1;
+	} while (dur--);
+	return 0;
+}
+
+int
+tcdrain (int fd) {
+	return _ioctl (fd, _TCSBRK, 1);
+}
+
+int
+tcflush(int fd, int what) {
+	return _ioctl (fd, _TCFLSH, what);
+}
+
+/*
+ * I'm not positive about this function.  I *think* it's right,
+ * but I could be missing something.
+ */
+
+int
+tcflow (int fd, int action) {
+	struct termios t;
+
+	switch (action) {
+	case TCOOFF:
+	case TCOON:
+		return _ioctl (fd, _TCXONC, action);
+/*
+ * Here is where I'm not terribly certain.  1003.1 says:
+ * if action is TCIOFF, the system shall transmit a STOP
+ * character, which is intended to cause the terminal device
+ * to stop transmitting data to the system.  (Similarly for
+ * TCION.)
+ * I *assume* that means I find out what VSTOP for the
+ * terminal device is, and then write it.  1003.1 also does
+ * not say what happens if c_cc[VSTOP] is _POSIX_VDISABLE;
+ * I assume it should reaturn EINVAL, so that's what I do.
+ * Anyway, here's the code.  It might or might not be right.
+ */
+	case TCIOFF:
+		if (tcgetattr (fd, &t) == -1)
+			return -1;
+		if (tcgetattr (fd, &t) == -1)
+			return -1;
+#ifdef _POSIX_VDISABLE
+		if (t.c_cc[VSTOP] == _POSIX_VDISABLE) {
+			errno = EINVAL;
+			return -1;
+		}
+#endif
+		if (write (fd, &t.c_cc[VSTOP], 1) == 1)
+			return 0;
+		else
+			return -1;
+	case TCION:
+		if (tcgetattr (fd, &t) == -1)
+			return -1;
+		if (tcgetattr (fd, &t) == -1)
+			return -1;
+#ifdef _POSIX_VDISABLE
+		if (t.c_cc[VSTART] == _POSIX_VDISABLE) {
+			errno = EINVAL;
+			return -1;
+		}
+#endif
+		if (write (fd, &t.c_cc[VSTART], 1) == 1)
+			return 0;
+		else
+			return -1;
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+}