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readline only handles SIGWINCH

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* acinclude.m4 (GUILE_READLINE): Check for rl_catch_signals and
  rl_catch_sigwinch.

* guile-readline/readline.c (scm_init_readline): If we can, turn off
  readline's signal handling, because we can do our own.
  (scm_readline): Use dynwinds to handle resetting readline's state on
  nonlocal exit, not catches.
  (unwind_readline): Rename from handle_error.
This commit is contained in:
Andy Wingo 2010-07-09 16:48:30 +02:00
parent adb825b678
commit ddfb5e2bb0
2 changed files with 23 additions and 9 deletions
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29
guile-readline/readline.c
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@ -146,7 +146,7 @@ static int in_readline = 0;
static SCM reentry_barrier_mutex;
static SCM internal_readline (SCM text);
static SCM handle_error (void *data, SCM tag, SCM args);
static void unwind_readline (void *unused);
static void reentry_barrier (void);
@ -200,10 +200,12 @@ SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
scm_readline_init_ports (inp, outp);
ans = scm_internal_catch (SCM_BOOL_T,
(scm_t_catch_body) internal_readline,
(void *) SCM_UNPACK (text),
handle_error, 0);
scm_dynwind_begin (0);
scm_dynwind_unwind_handler (unwind_readline, NULL, 0);
ans = internal_readline (text);
scm_dynwind_end ();
#ifndef __MINGW32__
fclose (rl_instream);
@ -231,8 +233,9 @@ reentry_barrier ()
scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
}
static SCM
handle_error (void *data, SCM tag, SCM args)
/* This function is only called on nonlocal exit from readline(). */
static void
unwind_readline (void *unused)
{
rl_free_line_state ();
rl_cleanup_after_signal ();
@ -242,8 +245,6 @@ handle_error (void *data, SCM tag, SCM args)
fclose (rl_outstream);
#endif
--in_readline;
scm_handle_by_throw (data, tag, args);
return SCM_UNSPECIFIED; /* never reached */
}
static SCM
@ -557,6 +558,16 @@ scm_init_readline ()
rl_basic_word_break_characters = " \t\n\"'`;()";
rl_readline_name = "Guile";
/* Let Guile handle signals. */
#if defined (HAVE_DECL_RL_CATCH_SIGNALS) && HAVE_DECL_RL_CATCH_SIGNALS
rl_catch_signals = 0;
#endif
/* But let readline handle SIGWINCH. */
#if defined (HAVE_DECL_RL_CATCH_SIGWINCH) && HAVE_DECL_RL_CATCH_SIGWINCH
rl_catch_sigwinch = 1;
#endif
reentry_barrier_mutex = scm_make_mutex ();
scm_init_opts (scm_readline_options,
scm_readline_opts);