[gnome-builder/gnome-builder-3-32] foundry: use child-side of PTY device

[Christian Hergert <chergert src gnome org>]

commit b7b3a90ffa58d1d1843ddbd9d226f8a9ad4b0f4b
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 26 14:39:56 2019 -0700

    foundry: use child-side of PTY device
    
    We were previously using the master side of the deivce, which means we'd
    get blocked eventually (as nothing was reading from it). Instead we need
    to treat this like another child process and give it that side of the PTY.
    
    Fixes #895

 src/libide/foundry/ide-runner.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/src/libide/foundry/ide-runner.c b/src/libide/foundry/ide-runner.c
index c9b48c0e6..58454a1ac 100644
--- a/src/libide/foundry/ide-runner.c
+++ b/src/libide/foundry/ide-runner.c
@@ -25,6 +25,7 @@
 #include <dazzle.h>
 #include <errno.h>
 #include <glib/gi18n.h>
+#include <libide-io.h>
 #include <libide-threading.h>
 #include <libpeas/peas.h>
 #include <stdlib.h>
@@ -1220,15 +1221,23 @@ void
 ide_runner_set_pty (IdeRunner *self,
                     VtePty    *pty)
 {
-  int fd = -1;
+  int child_fd = -1;
 
   g_return_if_fail (IDE_IS_RUNNER (self));
   g_return_if_fail (!pty || VTE_IS_PTY (pty));
 
   if (pty != NULL)
-    fd = vte_pty_get_fd (pty);
+    {
+      int parent_fd = vte_pty_get_fd (pty);
+
+      if (parent_fd != -1)
+        child_fd = ide_pty_intercept_create_slave (parent_fd, TRUE);
+    }
+
+  ide_runner_set_tty (self, child_fd);
 
-  ide_runner_set_tty (self, fd);
+  if (child_fd != -1)
+    close (child_fd);
 }
 
 static gint