[RFA v2 06/24] Change open_terminal_stream to return a gdb_file_up

[Tom Tromey <tom at tromey dot com>]

This changes open_terminal_stream to return a gdb_file_up, eliminating
another use of make_cleanup_fclose.  Arguably perhaps new_ui should
take ownership of the files using a move, but there is at least one
spot where this isn't appropriate (or at least not currently done), so
I elected to use a more minimal approach.

ChangeLog
2017-07-25  Tom Tromey  <tom@tromey.com>

	* top.c (open_terminal_stream): Return gdb_file_up.
	(new_ui_command): Update.
---
 gdb/ChangeLog |  5 +++++
 gdb/top.c     | 24 ++++++++++++------------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4c23f79..c1730dd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2017-07-25  Tom Tromey  <tom@tromey.com>
 
+	* top.c (open_terminal_stream): Return gdb_file_up.
+	(new_ui_command): Update.
+
+2017-07-25  Tom Tromey  <tom@tromey.com>
+
 	* source.c (print_source_lines_base, forward_search_command)
 	(reverse_search_command): Use gdb_file_up.
 
diff --git a/gdb/top.c b/gdb/top.c
index 4c53efd..2504eb6 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -346,16 +346,16 @@ make_delete_ui_cleanup (struct ui *ui)
 /* Open file named NAME for read/write, making sure not to make it the
    controlling terminal.  */
 
-static FILE *
+static gdb_file_up
 open_terminal_stream (const char *name)
 {
   int fd;
 
-  fd = open (name, O_RDWR | O_NOCTTY);
+  fd = gdb_open_cloexec (name, O_RDWR | O_NOCTTY, 0);
   if (fd < 0)
     perror_with_name  (_("opening terminal failed"));
 
-  return fdopen (fd, "w+");
+  return gdb_file_up (fdopen (fd, "w+"));
 }
 
 /* Implementation of the "new-ui" command.  */
@@ -365,7 +365,7 @@ new_ui_command (char *args, int from_tty)
 {
   struct ui *ui;
   struct interp *interp;
-  FILE *stream[3] = { NULL, NULL, NULL };
+  gdb_file_up stream[3];
   int i;
   int res;
   int argc;
@@ -390,18 +390,13 @@ new_ui_command (char *args, int from_tty)
   {
     scoped_restore save_ui = make_scoped_restore (&current_ui);
 
-    failure_chain = make_cleanup (null_cleanup, NULL);
-
     /* Open specified terminal, once for each of
        stdin/stdout/stderr.  */
     for (i = 0; i < 3; i++)
-      {
-	stream[i] = open_terminal_stream (tty_name);
-	make_cleanup_fclose (stream[i]);
-      }
+      stream[i] = open_terminal_stream (tty_name);
 
-    ui = new_ui (stream[0], stream[1], stream[2]);
-    make_cleanup (delete_ui_cleanup, ui);
+    ui = new_ui (stream[0].get (), stream[1].get (), stream[2].get ());
+    failure_chain = make_cleanup (delete_ui_cleanup, ui);
 
     ui->async = 1;
 
@@ -411,6 +406,11 @@ new_ui_command (char *args, int from_tty)
 
     interp_pre_command_loop (top_level_interpreter ());
 
+    /* Make sure the files are not closed.  */
+    stream[0].release ();
+    stream[1].release ();
+    stream[2].release ();
+
     discard_cleanups (failure_chain);
 
     /* This restores the previous UI and frees argv.  */
-- 
2.9.3