unix: allow tty raw mode to be turned off

include/uv-private/uv-unix.h

@@ -37,7 +37,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <netdb.h>
-
+#include <termios.h>
 
 /* Note: May be cast to struct iovec. See writev(2). */
 typedef struct {
@@ -184,6 +184,8 @@ typedef int uv_file;
 #define UV_WORK_PRIVATE_FIELDS \
   eio_req* eio;
 
-#define UV_TTY_PRIVATE_FIELDS /* empty */
+#define UV_TTY_PRIVATE_FIELDS \
+  struct termios orig_termios; \
+  int mode;
 
 #endif /* UV_UNIX_H */

src/unix/tty.c

@@ -34,38 +34,51 @@ int uv_tty_init(uv_loop_t* loop, uv_tty_t* tty, int fd) {
   uv__stream_init(loop, (uv_stream_t*)tty, UV_TTY);
   uv__stream_open((uv_stream_t*)tty, fd, UV_READABLE | UV_WRITABLE);
   loop->counters.tty_init++;
+  tty->mode = 0;
   return 0;
 }
 
 
 int uv_tty_set_mode(uv_tty_t* tty, int mode) {
   int fd = tty->fd;
-  struct termios orig_termios; /* in order to restore at exit */
   struct termios raw;
 
-  if (tcgetattr(fd, &orig_termios) == -1) goto fatal;
+  if (mode && tty->mode == 0) {
+    /* on */
 
-  raw = orig_termios;  /* modify the original mode */
-  /* input modes: no break, no CR to NL, no parity check, no strip char,
-   * no start/stop output control. */
-  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
-  /* output modes */
-  raw.c_oflag |= (ONLCR);
-  /* control modes - set 8 bit chars */
-  raw.c_cflag |= (CS8);
-  /* local modes - echoing off, canonical off, no extended functions,
-   * no signal chars (^Z,^C) */
-  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
-  /* control chars - set return condition: min number of bytes and timer.
-   * We want read to return every single byte, without timeout. */
-  raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
+    if (tcgetattr(fd, &tty->orig_termios)) {
+      goto fatal;
+    }
 
-  /* put terminal in raw mode after flushing */
-  if (tcsetattr(fd, TCSAFLUSH, &raw) < 0) goto fatal;
-  return 0;
+    raw = tty->orig_termios;
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    raw.c_oflag |= (ONLCR);
+    raw.c_cflag |= (CS8);
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+    raw.c_cc[VMIN] = 1;
+    raw.c_cc[VTIME] = 0;
+
+    /* Put terminal in raw mode after flushing */
+    if (tcsetattr(fd, TCSAFLUSH, &raw)) {
+      goto fatal;
+    }
+
+    tty->mode = 1;
+    return 0;
+  } else if (mode == 0 && tty->mode) {
+    /* off */
+
+    /* Put terminal in original mode after flushing */
+    if (tcsetattr(fd, TCSAFLUSH, &tty->orig_termios)) {
+      goto fatal;
+    }
+
+    tty->mode = 0;
+    return 0;
+  }
 
 fatal:
-  uv__set_sys_error(tty->loop, ENOTTY);
+  uv__set_sys_error(tty->loop, errno);
   return -1;
 }
 

test/test-tty.c

@@ -48,6 +48,16 @@ TEST_IMPL(tty) {
   ASSERT(width > 10);
   ASSERT(height > 10);
 
+  /* Turn on raw mode. */
+  r = uv_tty_set_mode(&tty, 1);
+  ASSERT(r == 0);
+
+  /* Turn off raw mode. */
+  r = uv_tty_set_mode(&tty, 0);
+  ASSERT(r == 0);
+
+  /* TODO check the actual mode! */
+
   uv_close((uv_handle_t*)&tty, NULL);
 
   uv_run(loop);