commit bash-20160715 snapshot

lib/readline/callback.c

@@ -50,6 +50,14 @@
 _rl_callback_func_t *_rl_callback_func = 0;
 _rl_callback_generic_arg *_rl_callback_data = 0;
 
+/* Applications can set this to non-zero to have readline's signal handlers
+   installed during the entire duration of reading a complete line, as in
+   readline-6.2.  This should be used with care, because it can result in
+   readline receiving signals and not handling them until it's called again
+   via rl_callback_read_char, thereby stealing them from the application.
+   By default, signal handlers are only active while readline is active. */   
+int rl_persistent_signal_handlers = 0;
+
 /* **************************************************************** */
 /*								    */
 /*			Callback Readline Functions		 */
@@ -82,6 +90,11 @@ _rl_callback_newline ()
 
       if (rl_prep_term_function)
 	(*rl_prep_term_function) (_rl_meta_flag);
+
+#if defined (HANDLE_SIGNALS)
+      if (rl_persistent_signal_handlers)
+	rl_set_signals ();
+#endif
     }
 
   readline_internal_setup ();
@@ -103,7 +116,8 @@ rl_callback_handler_install (prompt, linefunc)
 #if defined (HANDLE_SIGNALS)
 #define CALLBACK_READ_RETURN() \
   do { \
-    rl_clear_signals (); \
+    if (rl_persistent_signal_handlers == 0) \
+      rl_clear_signals (); \
     return; \
   } while (0)
 #else
@@ -140,7 +154,8 @@ rl_callback_read_char ()
 
 #if defined (HANDLE_SIGNALS)
   /* Install signal handlers only when readline has control. */
-  rl_set_signals ();
+  if (rl_persistent_signal_handlers == 0)
+    rl_set_signals ();
 #endif
 
   do

lib/readline/doc/rltech.texi

@@ -1591,6 +1591,22 @@ using the callback interface should be prepared to clean up Readline's
 state if they wish to handle the signal before the line handler completes
 and restores the terminal state.
 
+If an application using the callback interface wishes to have Readline
+install its signal handlers at the time the application calls
+@code{rl_callback_handler_install} and remove them only when a complete
+line of input has been read, it should set the
+@code{rl_persistent_signal_handlers} variable to a non-zero value.
+This allows an application to defer all of the handling of the signals
+Readline catches to Readline.
+Applications should use this variable with care; it can result in Readline
+catching signals and not acting on them (or allowing the application to react
+to them) until the application calls @code{rl_callback_read_char}.  This
+can result in an application becoming less responsive to keyboard signals
+like SIGINT.
+If an application does not want or need to perform any signal handling, or
+does not need to do any processing between calls to @code{rl_callback_read_char},
+setting this variable may be desirable.
+
 Readline provides two variables that allow application writers to
 control whether or not it will catch certain signals and act on them
 when they are received.  It is important that applications change the
@@ -1612,6 +1628,15 @@ Readline will install a signal handler for @code{SIGWINCH}.
 The default value of @code{rl_catch_sigwinch} is 1.
 @end deftypevar
 
+@deftypevar int rl_persistent_signal_handlers
+If an application using the callback interface wishes Readline's signal
+handlers to be installed and active during the set of calls to
+@code{rl_callback_read_char} that constitutes an entire single line,
+it should set this variable to a non-zero value.
+
+The default value of @code{rl_persistent_signal_handlers} is 0.
+@end deftypevar
+
 @deftypevar int rl_change_environment
 If this variable is set to a non-zero value,
 and Readline is handling @code{SIGWINCH}, Readline will modify the
@@ -1627,6 +1652,11 @@ for example),
 Readline provides convenience functions to do the necessary terminal
 and internal state cleanup upon receipt of a signal.
 
+@deftypefun int rl_pending_signal (void)
+Return the signal number of the most recent signal Readline received but
+has not yet handled, or 0 if there is no pending signal.
+@end deftypefun
+
 @deftypefun void rl_cleanup_after_signal (void)
 This function will reset the state of the terminal to what it was before
 @code{readline()} was called, and remove the Readline signal handlers for

lib/readline/doc/version.texi

@@ -4,7 +4,7 @@ Copyright (C) 1988-2016 Free Software Foundation, Inc.
 
 @set EDITION 7.0
 @set VERSION 7.0
-@set UPDATED 20 April 2016
-@set UPDATED-MONTH April 2016
+@set UPDATED 16 July 2016
+@set UPDATED-MONTH July 2016
 
-@set LASTCHANGE Wed Apr 20 13:32:48 PDT 2016
+@set LASTCHANGE Sat Jul 16 13:43:15 EDT 2016

lib/readline/readline.h

@@ -442,6 +442,8 @@ extern void rl_cleanup_after_signal PARAMS((void));
 extern void rl_reset_after_signal PARAMS((void));
 extern void rl_free_line_state PARAMS((void));
 
+extern int rl_pending_signal PARAMS((void));
+
 extern void rl_echo_signal_char PARAMS((int)); 
 
 extern int rl_set_paren_blink_timeout PARAMS((int));
@@ -640,7 +642,7 @@ extern rl_compentry_func_t *rl_completion_entry_function;
 
 /* Optional generator for menu completion.  Default is
    rl_completion_entry_function (rl_filename_completion_function). */
- extern rl_compentry_func_t *rl_menu_completion_entry_function;
+extern rl_compentry_func_t *rl_menu_completion_entry_function;
 
 /* If rl_ignore_some_completions_function is non-NULL it is the address
    of a function to call after all of the possible matches have been
@@ -832,6 +834,14 @@ extern int rl_ignore_completion_duplicates;
    completion character will be inserted as any other. */
 extern int rl_inhibit_completion;
 
+/* Applications can set this to non-zero to have readline's signal handlers
+   installed during the entire duration of reading a complete line, as in
+   readline-6.2.  This should be used with care, because it can result in
+   readline receiving signals and not handling them until it's called again
+   via rl_callback_read_char, thereby stealing them from the application.
+   By default, signal handlers are only active while readline is active. */   
+extern int rl_persistent_signal_handlers;
+
 /* Input error; can be returned by (*rl_getc_function) if readline is reading
    a top-level command (RL_ISSTATE (RL_STATE_READCMD)). */
 #define READERR			(-2)

lib/readline/signals.c

@@ -1,6 +1,6 @@
 /* signals.c -- signal handling support for readline. */
 
-/* Copyright (C) 1987-2015 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2016 Free Software Foundation, Inc.
 
    This file is part of the GNU Readline Library (Readline), a library
    for reading lines of text with interactive input and history editing.      
@@ -585,6 +585,11 @@ rl_free_line_state ()
   _rl_reset_argument ();
 }
 
+int
+rl_pending_signal ()
+{
+  return (_rl_caught_signal);
+}
 #endif  /* HANDLE_SIGNALS */
 
 /* **************************************************************** */