/* signals.c -- signal handling support for readline. */
-/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2005 Free Software Foundation, Inc.
This file is part of the GNU Readline Library, a library for
reading lines of text with interactive input and history editing.
The GNU Readline Library is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 1, or
+ as published by the Free Software Foundation; either version 2, or
(at your option) any later version.
The GNU Readline Library is distributed in the hope that it will be
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#define READLINE_LIBRARY
-#include <stdio.h>
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <stdio.h> /* Just for NULL. Yuck. */
#include <sys/types.h>
-#include <fcntl.h>
-#if !defined (NO_SYS_FILE)
-# include <sys/file.h>
-#endif /* !NO_SYS_FILE */
#include <signal.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
-#if defined (HAVE_STDLIB_H)
-# include <stdlib.h>
-#else
-# include "ansi_stdlib.h"
-#endif /* HAVE_STDLIB_H */
-
-#include <errno.h>
-/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-#include "posixstat.h"
-
/* System-specific feature definitions and include files. */
#include "rldefs.h"
# include <sys/ioctl.h>
#endif /* GWINSZ_IN_SYS_IOCTL */
+#if defined (HANDLE_SIGNALS)
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
-extern int readline_echoing_p;
-extern int rl_pending_input;
-extern int _rl_meta_flag;
+#include "rlprivate.h"
-extern void free_undo_list ();
+#if !defined (RETSIGTYPE)
+# if defined (VOID_SIGHANDLER)
+# define RETSIGTYPE void
+# else
+# define RETSIGTYPE int
+# endif /* !VOID_SIGHANDLER */
+#endif /* !RETSIGTYPE */
#if defined (VOID_SIGHANDLER)
-# define sighandler void
+# define SIGHANDLER_RETURN return
#else
-# define sighandler int
-#endif /* VOID_SIGHANDLER */
+# define SIGHANDLER_RETURN return (0)
+#endif
-/* This typedef is equivalant to the one for Function; it allows us
+/* This typedef is equivalent to the one for Function; it allows us
to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
-typedef sighandler SigHandler ();
+typedef RETSIGTYPE SigHandler ();
+
+#if defined (HAVE_POSIX_SIGNALS)
+typedef struct sigaction sighandler_cxt;
+# define rl_sigaction(s, nh, oh) sigaction(s, nh, oh)
+#else
+typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt;
+# define sigemptyset(m)
+#endif /* !HAVE_POSIX_SIGNALS */
+
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
-#if defined (__GO32__)
-# undef HANDLE_SIGNALS
-#endif /* __GO32__ */
+static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
-#if defined (STATIC_MALLOC)
-static char *xmalloc (), *xrealloc ();
+/* Exported variables for use by applications. */
+
+/* If non-zero, readline will install its own signal handlers for
+ SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
+int rl_catch_signals = 1;
+
+/* If non-zero, readline will install a signal handler for SIGWINCH. */
+#ifdef SIGWINCH
+int rl_catch_sigwinch = 1;
#else
-extern char *xmalloc (), *xrealloc ();
-#endif /* STATIC_MALLOC */
+int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */
+#endif
+
+static int signals_set_flag;
+static int sigwinch_set_flag;
-\f
/* **************************************************************** */
/* */
/* Signal Handling */
/* */
/* **************************************************************** */
+static sighandler_cxt old_int, old_term, old_alrm, old_quit;
+#if defined (SIGTSTP)
+static sighandler_cxt old_tstp, old_ttou, old_ttin;
+#endif
#if defined (SIGWINCH)
-static SigHandler *old_sigwinch = (SigHandler *)NULL;
+static sighandler_cxt old_winch;
+#endif
-static sighandler
-rl_handle_sigwinch (sig)
- int sig;
-{
- if (readline_echoing_p)
- {
- _rl_set_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
+/* Readline signal handler functions. */
- if (old_sigwinch &&
- old_sigwinch != (SigHandler *)SIG_IGN &&
- old_sigwinch != (SigHandler *)SIG_DFL)
- (*old_sigwinch) (sig);
-#if !defined (VOID_SIGHANDLER)
- return (0);
-#endif /* VOID_SIGHANDLER */
-}
-#endif /* SIGWINCH */
-
-#if defined (HANDLE_SIGNALS)
-/* Interrupt handling. */
-static SigHandler
- *old_int = (SigHandler *)NULL,
- *old_alrm = (SigHandler *)NULL;
-#if !defined (SHELL)
-static SigHandler
- *old_tstp = (SigHandler *)NULL,
- *old_ttou = (SigHandler *)NULL,
- *old_ttin = (SigHandler *)NULL,
- *old_cont = (SigHandler *)NULL;
-#endif /* !SHELL */
-
-/* Handle an interrupt character. */
-static sighandler
+static RETSIGTYPE
rl_signal_handler (sig)
int sig;
{
#else /* !HAVE_POSIX_SIGNALS */
# if defined (HAVE_BSD_SIGNALS)
long omask;
-# endif /* HAVE_BSD_SIGNALS */
+# else /* !HAVE_BSD_SIGNALS */
+ sighandler_cxt dummy_cxt; /* needed for rl_set_sighandler call */
+# endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+
#if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS)
/* Since the signal will not be blocked while we are in the signal
handler, ignore it until rl_clear_signals resets the catcher. */
+# if defined (SIGALRM)
+ if (sig == SIGINT || sig == SIGALRM)
+# else
if (sig == SIGINT)
- signal (sig, SIG_IGN);
-#endif /* !HAVE_BSD_SIGNALS */
+# endif
+ rl_set_sighandler (sig, SIG_IGN, &dummy_cxt);
+#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
switch (sig)
{
case SIGINT:
- {
- register HIST_ENTRY *entry;
-
- free_undo_list ();
-
- entry = current_history ();
- if (entry)
- entry->data = (char *)NULL;
- }
- _rl_kill_kbd_macro ();
- rl_clear_message ();
- rl_init_argument ();
+ rl_free_line_state ();
+ /* FALLTHROUGH */
+ case SIGTERM:
#if defined (SIGTSTP)
case SIGTSTP:
case SIGTTOU:
case SIGTTIN:
#endif /* SIGTSTP */
+#if defined (SIGALRM)
case SIGALRM:
- rl_clean_up_for_exit ();
- rl_deprep_terminal ();
- rl_clear_signals ();
- rl_pending_input = 0;
+#endif
+#if defined (SIGQUIT)
+ case SIGQUIT:
+#endif
+ rl_cleanup_after_signal ();
#if defined (HAVE_POSIX_SIGNALS)
sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#if defined (__EMX__)
+ signal (sig, SIG_ACK);
+#endif
+
+#if defined (HAVE_KILL)
kill (getpid (), sig);
+#else
+ raise (sig); /* assume we have raise */
+#endif
/* Let the signal that we just sent through. */
#if defined (HAVE_POSIX_SIGNALS)
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- rl_prep_terminal (_rl_meta_flag);
- rl_set_signals ();
+ rl_reset_after_signal ();
}
-#if !defined (VOID_SIGHANDLER)
- return (0);
-#endif /* !VOID_SIGHANDLER */
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+ SIGHANDLER_RETURN;
}
-#if defined (HAVE_POSIX_SIGNALS)
+#if defined (SIGWINCH)
+static RETSIGTYPE
+rl_sigwinch_handler (sig)
+ int sig;
+{
+ SigHandler *oh;
+
+#if defined (MUST_REINSTALL_SIGHANDLERS)
+ sighandler_cxt dummy_winch;
+
+ /* We don't want to change old_winch -- it holds the state of SIGWINCH
+ disposition set by the calling application. We need this state
+ because we call the application's SIGWINCH handler after updating
+ our own idea of the screen size. */
+ rl_set_sighandler (SIGWINCH, rl_sigwinch_handler, &dummy_winch);
+#endif
+
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+ rl_resize_terminal ();
+
+ /* If another sigwinch handler has been installed, call it. */
+ oh = (SigHandler *)old_winch.sa_handler;
+ if (oh && oh != (SigHandler *)SIG_IGN && oh != (SigHandler *)SIG_DFL)
+ (*oh) (sig);
+
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+ SIGHANDLER_RETURN;
+}
+#endif /* SIGWINCH */
+
+/* Functions to manage signal handling. */
+
+#if !defined (HAVE_POSIX_SIGNALS)
+static int
+rl_sigaction (sig, nh, oh)
+ int sig;
+ sighandler_cxt *nh, *oh;
+{
+ oh->sa_handler = signal (sig, nh->sa_handler);
+ return 0;
+}
+#endif /* !HAVE_POSIX_SIGNALS */
+
+/* Set up a readline-specific signal handler, saving the old signal
+ information in OHANDLER. Return the old signal handler, like
+ signal(). */
static SigHandler *
-rl_set_sighandler (sig, handler)
+rl_set_sighandler (sig, handler, ohandler)
int sig;
SigHandler *handler;
+ sighandler_cxt *ohandler;
{
- struct sigaction act, oact;
+ sighandler_cxt old_handler;
+#if defined (HAVE_POSIX_SIGNALS)
+ struct sigaction act;
act.sa_handler = handler;
- act.sa_flags = 0;
+ act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
sigemptyset (&act.sa_mask);
- sigemptyset (&oact.sa_mask);
- sigaction (sig, &act, &oact);
- return (oact.sa_handler);
+ sigemptyset (&ohandler->sa_mask);
+ sigaction (sig, &act, &old_handler);
+#else
+ old_handler.sa_handler = (SigHandler *)signal (sig, handler);
+#endif /* !HAVE_POSIX_SIGNALS */
+
+ /* XXX -- assume we have memcpy */
+ /* If rl_set_signals is called twice in a row, don't set the old handler to
+ rl_signal_handler, because that would cause infinite recursion. */
+ if (handler != rl_signal_handler || old_handler.sa_handler != rl_signal_handler)
+ memcpy (ohandler, &old_handler, sizeof (sighandler_cxt));
+
+ return (ohandler->sa_handler);
}
-#else /* !HAVE_POSIX_SIGNALS */
-# define rl_set_sighandler(sig, handler) (SigHandler *)signal (sig, handler)
-#endif /* !HAVE_POSIX_SIGNALS */
+static void
+rl_maybe_set_sighandler (sig, handler, ohandler)
+ int sig;
+ SigHandler *handler;
+ sighandler_cxt *ohandler;
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+ sigemptyset (&dummy.sa_mask);
+ oh = rl_set_sighandler (sig, handler, ohandler);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (sig, ohandler, &dummy);
+}
+
+int
rl_set_signals ()
{
- old_int = (SigHandler *)rl_set_sighandler (SIGINT, rl_signal_handler);
- if (old_int == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGINT, SIG_IGN);
+ sighandler_cxt dummy;
+ SigHandler *oh;
- old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
- if (old_alrm == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGALRM, SIG_IGN);
+ if (rl_catch_signals && signals_set_flag == 0)
+ {
+ rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+#if defined (SIGQUIT)
+ rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
+#endif
-#if !defined (SHELL)
+#if defined (SIGALRM)
+ oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
+#if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART)
+ /* If the application using readline has already installed a signal
+ handler with SA_RESTART, SIGALRM will cause reads to be restarted
+ automatically, so readline should just get out of the way. Since
+ we tested for SIG_IGN above, we can just test for SIG_DFL here. */
+ if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
+#endif /* HAVE_POSIX_SIGNALS */
+#endif /* SIGALRM */
#if defined (SIGTSTP)
- old_tstp = (SigHandler *)rl_set_sighandler (SIGTSTP, rl_signal_handler);
- if (old_tstp == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGTSTP, SIG_IGN);
+ rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
#endif /* SIGTSTP */
-#if defined (SIGTTOU)
- old_ttou = (SigHandler *)rl_set_sighandler (SIGTTOU, rl_signal_handler);
- old_ttin = (SigHandler *)rl_set_sighandler (SIGTTIN, rl_signal_handler);
- if (old_tstp == (SigHandler *)SIG_IGN)
- {
- rl_set_sighandler (SIGTTOU, SIG_IGN);
- rl_set_sighandler (SIGTTIN, SIG_IGN);
- }
+#if defined (SIGTTOU)
+ rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
#endif /* SIGTTOU */
-#endif /* !SHELL */
+#if defined (SIGTTIN)
+ rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 1;
+ }
#if defined (SIGWINCH)
- old_sigwinch =
- (SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 0)
+ {
+ rl_maybe_set_sighandler (SIGWINCH, rl_sigwinch_handler, &old_winch);
+ sigwinch_set_flag = 1;
+ }
#endif /* SIGWINCH */
+
return 0;
}
+int
rl_clear_signals ()
{
- rl_set_sighandler (SIGINT, old_int);
- rl_set_sighandler (SIGALRM, old_alrm);
+ sighandler_cxt dummy;
-#if !defined (SHELL)
+ if (rl_catch_signals && signals_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
-#if defined (SIGTSTP)
- rl_set_sighandler (SIGTSTP, old_tstp);
+ rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (SIGTERM, &old_term, &dummy);
+#if defined (SIGQUIT)
+ rl_sigaction (SIGQUIT, &old_quit, &dummy);
+#endif
+#if defined (SIGALRM)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#endif
+#if defined (SIGTSTP)
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+#endif /* SIGTSTP */
+
#if defined (SIGTTOU)
- rl_set_sighandler (SIGTTOU, old_ttou);
- rl_set_sighandler (SIGTTIN, old_ttin);
+ rl_sigaction (SIGTTOU, &old_ttou, &dummy);
#endif /* SIGTTOU */
-#endif /* !SHELL */
+#if defined (SIGTTIN)
+ rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 0;
+ }
#if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, old_sigwinch);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
+ rl_sigaction (SIGWINCH, &old_winch, &dummy);
+ sigwinch_set_flag = 0;
+ }
#endif
return 0;
}
+
+/* Clean up the terminal and readline state after catching a signal, before
+ resending it to the calling application. */
+void
+rl_cleanup_after_signal ()
+{
+ _rl_clean_up_for_exit ();
+ if (rl_deprep_term_function)
+ (*rl_deprep_term_function) ();
+ rl_clear_signals ();
+ rl_clear_pending_input ();
+}
+
+/* Reset the terminal and readline state after a signal handler returns. */
+void
+rl_reset_after_signal ()
+{
+ if (rl_prep_term_function)
+ (*rl_prep_term_function) (_rl_meta_flag);
+ rl_set_signals ();
+}
+
+/* Free up the readline variable line state for the current line (undo list,
+ any partial history entry, any keyboard macros in progress, and any
+ numeric arguments in process) after catching a signal, before calling
+ rl_cleanup_after_signal(). */
+void
+rl_free_line_state ()
+{
+ register HIST_ENTRY *entry;
+
+ rl_free_undo_list ();
+
+ entry = current_history ();
+ if (entry)
+ entry->data = (char *)NULL;
+
+ _rl_kill_kbd_macro ();
+ rl_clear_message ();
+ _rl_reset_argument ();
+}
+
#endif /* HANDLE_SIGNALS */
projects / platform / upstream / bash.git / blobdiff