Make stdin be per UI

This commit makes each UI have its own "stdin" stream pointer.  This
is used to determine whether the "from_tty" argument to
execute_command, etc. should be true.

Related, this commit makes input_from_terminal_p take an UI parameter,
and then avoids the gdb_has_a_terminal in it.  gdb_has_a_terminal only
returns info on gdb's own main/primary terminal (the real stdin).
However, the places that call input_from_terminal_p really want to
know is whether the command came from an interactive tty.  This patch
thus renames input_from_terminal_p to input_interactive_p for clarity,
and then makes input_interactive_p check for "set interactive" itself,
along with ISATTY, instead of calling gdb_has_a_terminal.  Actually,
quit_force wants to call input_interactive_p _after_ stdin is closed,
we can't call ISATTY that late.  So instead we save the result of
ISATTY in a field of the UI.

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* cli/cli-script.c (read_next_line): Adjust to per-UI stdin.
	(read_command_lines): Use input_interactive_p instead of
	input_from_terminal_p.
	* defs.h (struct ui): Forward declare.
	(input_from_terminal_p): Rename to ...
	(input_interactive_p): ... this.
	* event-top.c (stdin_event_handler): Pass 0 as from_tty argument
	to quit_command.
	(command_handler): Adjust to per-UI stdin.
	(handle_line_of_input): Adjust to per-UI stdin and use
	input_interactive_p instead of ISATTY and input_from_terminal_p.
	(gdb_readline_no_editing_callback): Adjust to per-UI stdin.
	(command_line_handler): Always pass true as "from_tty" parameter
	of handle_line_of_input and execute_command.
	(async_sigterm_handler): Pass 0 as from_tty argument to
	quit_command.
	* inflow.c (interactive_mode, show_interactive_mode): Moved to ...
	(gdb_has_a_terminal): Don't check interactive_mode here.
	(_initialize_inflow): Don't install "set interactive-mode" here.
	* main.c (captured_command_loop): Adjust to per-UI stdin.
	* mi/mi-interp.c (mi_execute_command_wrapper): Adjust to per-UI
	stdin.
	* top.c (new_ui): Save the stdin stream and whether it's a tty.
	(dont_repeat): Adjust to per-UI stdin.
	(command_line_input): Adjust to per-UI stdin and to use
	input_interactive_p.
	(quit_force): Write history if any UI supports interactive input.
	(interactive_mode, show_interactive_mode): Move here, from
	inflow.c.
	(input_from_terminal_p): Rename to ...
	(input_interactive_p): ... this, and check the "interactive_mode"
	global instead of calling gdb_has_a_terminal.
	(_initialize_top): Install "set interactive-mode" here.
	* top.h (struct ui) <stdin_stream, input_interactive_p>: New
	fields.
	* utils.c (quit): Pass 0 as from_tty argument to quit_force.
	(defaulted_query): Adjust to per-UI stdin and to use
	input_interactive_p.

1 files changed, 6 insertions, 4 deletions

diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index 0507c55..579d0a4 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -935,12 +935,13 @@ read_next_line (void)
   struct ui *ui = current_ui;
   char *prompt_ptr, control_prompt[256];
   int i = 0;
+  int from_tty = ui->instream == ui->stdin_stream;
 
   if (control_level >= 254)
     error (_("Control nesting too deep!"));
 
   /* Set a prompt based on the nesting of the control commands.  */
-  if (ui->instream == stdin
+  if (from_tty
       || (ui->instream == 0 && deprecated_readline_hook != NULL))
     {
       for (i = 0; i < control_level; i++)
@@ -952,7 +953,7 @@ read_next_line (void)
   else
     prompt_ptr = NULL;
 
-  return command_line_input (prompt_ptr, ui->instream == stdin, "commands");
+  return command_line_input (prompt_ptr, from_tty, "commands");
 }
 
 /* Process one input line.  If the command is an "end", return such an
@@ -1256,7 +1257,7 @@ read_command_lines (char *prompt_arg, int from_tty, int parse_commands,
 {
   struct command_line *head;
 
-  if (from_tty && input_from_terminal_p ())
+  if (from_tty && input_interactive_p (current_ui))
     {
       if (deprecated_readline_begin_hook)
 	{
@@ -1287,7 +1288,8 @@ read_command_lines (char *prompt_arg, int from_tty, int parse_commands,
       do_cleanups (old_chain);
     }
 
-  if (deprecated_readline_end_hook && from_tty && input_from_terminal_p ())
+  if (from_tty && input_interactive_p (current_ui)
+      && deprecated_readline_end_hook)
     {
       (*deprecated_readline_end_hook) ();
     }