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-rw-r--r--readline/signals.c144
1 files changed, 99 insertions, 45 deletions
diff --git a/readline/signals.c b/readline/signals.c
index f119691..6143045 100644
--- a/readline/signals.c
+++ b/readline/signals.c
@@ -1,6 +1,6 @@
/* signals.c -- signal handling support for readline. */
-/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2011 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.
@@ -80,6 +80,7 @@ typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt
static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+static void rl_maybe_restore_sighandler PARAMS((int, sighandler_cxt *));
static RETSIGTYPE rl_signal_handler PARAMS((int));
static RETSIGTYPE _rl_handle_signal PARAMS((int));
@@ -87,7 +88,7 @@ static RETSIGTYPE _rl_handle_signal PARAMS((int));
/* 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. */
+ SIGINT, SIGTERM, SIGHUP, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
int rl_catch_signals = 1;
/* If non-zero, readline will install a signal handler for SIGWINCH. */
@@ -118,7 +119,7 @@ static int sigwinch_set_flag;
/* */
/* **************************************************************** */
-static sighandler_cxt old_int, old_term, old_alrm, old_quit;
+static sighandler_cxt old_int, old_term, old_hup, old_alrm, old_quit;
#if defined (SIGTSTP)
static sighandler_cxt old_tstp, old_ttou, old_ttin;
#endif
@@ -126,6 +127,9 @@ static sighandler_cxt old_tstp, old_ttou, old_ttin;
static sighandler_cxt old_winch;
#endif
+_rl_sigcleanup_func_t *_rl_sigcleanup;
+void *_rl_sigcleanarg;
+
/* Readline signal handler functions. */
/* Called from RL_CHECK_SIGNALS() macro */
@@ -135,7 +139,21 @@ _rl_signal_handler (sig)
{
_rl_caught_signal = 0; /* XXX */
- _rl_handle_signal (sig);
+#if defined (SIGWINCH)
+ if (sig == SIGWINCH)
+ {
+ rl_resize_terminal ();
+ /* XXX - experimental for now */
+ /* Call a signal hook because though we called the original signal handler
+ in rl_sigwinch_handler below, we will not resend the signal to
+ ourselves. */
+ if (rl_signal_event_hook)
+ (*rl_signal_event_hook) ();
+ }
+ else
+#endif
+ _rl_handle_signal (sig);
+
SIGHANDLER_RETURN;
}
@@ -143,7 +161,7 @@ static RETSIGTYPE
rl_signal_handler (sig)
int sig;
{
- if (_rl_interrupt_immediately || RL_ISSTATE(RL_STATE_CALLBACK))
+ if (_rl_interrupt_immediately)
{
_rl_interrupt_immediately = 0;
_rl_handle_signal (sig);
@@ -181,19 +199,43 @@ _rl_handle_signal (sig)
rl_set_sighandler (sig, SIG_IGN, &dummy_cxt);
#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
+ /* If there's a sig cleanup function registered, call it and `deregister'
+ the cleanup function to avoid multiple calls */
+ if (_rl_sigcleanup)
+ {
+ (*_rl_sigcleanup) (sig, _rl_sigcleanarg);
+ _rl_sigcleanup = 0;
+ _rl_sigcleanarg = 0;
+ }
+
switch (sig)
{
case SIGINT:
_rl_reset_completion_state ();
rl_free_line_state ();
+#if defined (READLINE_CALLBACKS)
+ rl_callback_sigcleanup ();
+#endif
+
/* FALLTHROUGH */
- case SIGTERM:
#if defined (SIGTSTP)
case SIGTSTP:
- case SIGTTOU:
case SIGTTIN:
+# if defined (HAVE_POSIX_SIGNALS)
+ /* Block SIGTTOU so we can restore the terminal settings to something
+ sane without stopping on SIGTTOU if we have been placed into the
+ background. Even trying to get the current terminal pgrp with
+ tcgetpgrp() will generate SIGTTOU, so we don't bother. Don't bother
+ doing this if we've been stopped on SIGTTOU; it's aready too late. */
+ sigemptyset (&set);
+ sigaddset (&set, SIGTTOU);
+ sigprocmask (SIG_BLOCK, &set, (sigset_t *)NULL);
+# endif
+ case SIGTTOU:
#endif /* SIGTSTP */
+ case SIGTERM:
+ case SIGHUP:
#if defined (SIGALRM)
case SIGALRM:
#endif
@@ -204,6 +246,10 @@ _rl_handle_signal (sig)
rl_cleanup_after_signal ();
#if defined (HAVE_POSIX_SIGNALS)
+ /* Unblock SIGTTOU blocked above */
+ if (sig == SIGTTIN || sig == SIGTSTP)
+ sigprocmask (SIG_UNBLOCK, &set, (sigset_t *)NULL);
+
sigemptyset (&set);
sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
sigdelset (&set, sig);
@@ -232,7 +278,7 @@ _rl_handle_signal (sig)
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- rl_reset_after_signal ();
+ rl_reset_after_signal ();
}
RL_UNSETSTATE(RL_STATE_SIGHANDLER);
@@ -257,7 +303,7 @@ rl_sigwinch_handler (sig)
#endif
RL_SETSTATE(RL_STATE_SIGHANDLER);
- rl_resize_terminal ();
+ _rl_caught_signal = sig;
/* If another sigwinch handler has been installed, call it. */
oh = (SigHandler *)old_winch.sa_handler;
@@ -317,6 +363,8 @@ rl_set_sighandler (sig, handler, ohandler)
return (ohandler->sa_handler);
}
+/* Set disposition of SIG to HANDLER, returning old state in OHANDLER. Don't
+ change disposition if OHANDLER indicates the signal was ignored. */
static void
rl_maybe_set_sighandler (sig, handler, ohandler)
int sig;
@@ -327,11 +375,29 @@ rl_maybe_set_sighandler (sig, handler, ohandler)
SigHandler *oh;
sigemptyset (&dummy.sa_mask);
+ dummy.sa_flags = 0;
oh = rl_set_sighandler (sig, handler, ohandler);
if (oh == (SigHandler *)SIG_IGN)
rl_sigaction (sig, ohandler, &dummy);
}
+/* Set the disposition of SIG to HANDLER, if HANDLER->sa_handler indicates the
+ signal was not being ignored. MUST only be called for signals whose
+ disposition was changed using rl_maybe_set_sighandler or for which the
+ SIG_IGN check was performed inline (e.g., SIGALRM below). */
+static void
+rl_maybe_restore_sighandler (sig, handler)
+ int sig;
+ sighandler_cxt *handler;
+{
+ sighandler_cxt dummy;
+
+ sigemptyset (&dummy.sa_mask);
+ dummy.sa_flags = 0;
+ if (handler->sa_handler != SIG_IGN)
+ rl_sigaction (sig, handler, &dummy);
+}
+
int
rl_set_signals ()
{
@@ -349,6 +415,7 @@ rl_set_signals ()
sigaddset (&bset, SIGINT);
sigaddset (&bset, SIGTERM);
+ sigaddset (&bset, SIGHUP);
#if defined (SIGQUIT)
sigaddset (&bset, SIGQUIT);
#endif
@@ -377,6 +444,7 @@ rl_set_signals ()
rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+ rl_maybe_set_sighandler (SIGHUP, rl_signal_handler, &old_hup);
#if defined (SIGQUIT)
rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
#endif
@@ -434,25 +502,31 @@ rl_clear_signals ()
{
sigemptyset (&dummy.sa_mask);
- rl_sigaction (SIGINT, &old_int, &dummy);
- rl_sigaction (SIGTERM, &old_term, &dummy);
+ /* Since rl_maybe_set_sighandler doesn't override a SIG_IGN handler,
+ we should in theory not have to restore a handler where
+ old_xxx.sa_handler == SIG_IGN. That's what rl_maybe_restore_sighandler
+ does. Fewer system calls should reduce readline's per-line
+ overhead */
+ rl_maybe_restore_sighandler (SIGINT, &old_int);
+ rl_maybe_restore_sighandler (SIGTERM, &old_term);
+ rl_maybe_restore_sighandler (SIGHUP, &old_hup);
#if defined (SIGQUIT)
- rl_sigaction (SIGQUIT, &old_quit, &dummy);
+ rl_maybe_restore_sighandler (SIGQUIT, &old_quit);
#endif
#if defined (SIGALRM)
- rl_sigaction (SIGALRM, &old_alrm, &dummy);
+ rl_maybe_restore_sighandler (SIGALRM, &old_alrm);
#endif
#if defined (SIGTSTP)
- rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+ rl_maybe_restore_sighandler (SIGTSTP, &old_tstp);
#endif /* SIGTSTP */
#if defined (SIGTTOU)
- rl_sigaction (SIGTTOU, &old_ttou, &dummy);
+ rl_maybe_restore_sighandler (SIGTTOU, &old_ttou);
#endif /* SIGTTOU */
#if defined (SIGTTIN)
- rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+ rl_maybe_restore_sighandler (SIGTTIN, &old_ttin);
#endif /* SIGTTIN */
signals_set_flag = 0;
@@ -540,21 +614,6 @@ _rl_block_sigint ()
if (sigint_blocked)
return;
-#if defined (HAVE_POSIX_SIGNALS)
- sigemptyset (&sigint_set);
- sigemptyset (&sigint_oset);
- sigaddset (&sigint_set, SIGINT);
- sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
-#else /* !HAVE_POSIX_SIGNALS */
-# if defined (HAVE_BSD_SIGNALS)
- sigint_oldmask = sigblock (sigmask (SIGINT));
-# else /* !HAVE_BSD_SIGNALS */
-# if defined (HAVE_USG_SIGHOLD)
- sighold (SIGINT);
-# endif /* HAVE_USG_SIGHOLD */
-# endif /* !HAVE_BSD_SIGNALS */
-#endif /* !HAVE_POSIX_SIGNALS */
-
sigint_blocked = 1;
}
@@ -565,22 +624,10 @@ _rl_release_sigint ()
if (sigint_blocked == 0)
return;
-#if defined (HAVE_POSIX_SIGNALS)
- sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
-#else
-# if defined (HAVE_BSD_SIGNALS)
- sigsetmask (sigint_oldmask);
-# else /* !HAVE_BSD_SIGNALS */
-# if defined (HAVE_USG_SIGHOLD)
- sigrelse (SIGINT);
-# endif /* HAVE_USG_SIGHOLD */
-# endif /* !HAVE_BSD_SIGNALS */
-#endif /* !HAVE_POSIX_SIGNALS */
-
sigint_blocked = 0;
+ RL_CHECK_SIGNALS ();
}
-#ifdef SIGWINCH
/* Cause SIGWINCH to not be delivered until the corresponding call to
release_sigwinch(). */
void
@@ -589,6 +636,8 @@ _rl_block_sigwinch ()
if (sigwinch_blocked)
return;
+#if defined (SIGWINCH)
+
#if defined (HAVE_POSIX_SIGNALS)
sigemptyset (&sigwinch_set);
sigemptyset (&sigwinch_oset);
@@ -604,6 +653,8 @@ _rl_block_sigwinch ()
# endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#endif /* SIGWINCH */
+
sigwinch_blocked = 1;
}
@@ -614,6 +665,8 @@ _rl_release_sigwinch ()
if (sigwinch_blocked == 0)
return;
+#if defined (SIGWINCH)
+
#if defined (HAVE_POSIX_SIGNALS)
sigprocmask (SIG_SETMASK, &sigwinch_oset, (sigset_t *)NULL);
#else
@@ -626,9 +679,10 @@ _rl_release_sigwinch ()
# endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#endif /* SIGWINCH */
+
sigwinch_blocked = 0;
}
-#endif /* SIGWINCH */
/* **************************************************************** */
/* */
generated by cgit v1.1 at 2024-11-24 00:15:05 +0000