diff options
Diffstat (limited to 'readline/signals.c')
| -rw-r--r-- | readline/signals.c | 277 |
1 files changed, 259 insertions, 18 deletions
diff --git a/readline/signals.c b/readline/signals.c index 2dca03f..6a68d78 100644 --- a/readline/signals.c +++ b/readline/signals.c @@ -1,24 +1,24 @@ /* signals.c -- signal handling support for readline. */ -/* Copyright (C) 1987-2005 Free Software Foundation, Inc. +/* Copyright (C) 1987-2009 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. + This file is part of the GNU Readline Library (Readline), 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 2, or + Readline 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 3 of the License, or (at your option) any later version. - The GNU Readline Library is distributed in the hope that it will be - useful, but WITHOUT ANY WARRANTY; without even the implied warranty - of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + Readline is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - 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, - 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ + You should have received a copy of the GNU General Public License + along with Readline. If not, see <http://www.gnu.org/licenses/>. +*/ + #define READLINE_LIBRARY #if defined (HAVE_CONFIG_H) @@ -40,13 +40,14 @@ # include <sys/ioctl.h> #endif /* GWINSZ_IN_SYS_IOCTL */ -#if defined (HANDLE_SIGNALS) /* Some standard library routines. */ #include "readline.h" #include "history.h" #include "rlprivate.h" +#if defined (HANDLE_SIGNALS) + #if !defined (RETSIGTYPE) # if defined (VOID_SIGHANDLER) # define RETSIGTYPE void @@ -80,6 +81,9 @@ 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 RETSIGTYPE rl_signal_handler PARAMS((int)); +static RETSIGTYPE _rl_handle_signal PARAMS((int)); + /* Exported variables for use by applications. */ /* If non-zero, readline will install its own signal handlers for @@ -93,6 +97,18 @@ int rl_catch_sigwinch = 1; int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */ #endif +/* Private variables. */ +int _rl_interrupt_immediately = 0; +int volatile _rl_caught_signal = 0; /* should be sig_atomic_t, but that requires including <signal.h> everywhere */ + +/* If non-zero, print characters corresponding to received signals as long as + the user has indicated his desire to do so (_rl_echo_control_chars). */ +int _rl_echoctl = 0; + +int _rl_intr_char = 0; +int _rl_quit_char = 0; +int _rl_susp_char = 0; + static int signals_set_flag; static int sigwinch_set_flag; @@ -112,10 +128,36 @@ static sighandler_cxt old_winch; /* Readline signal handler functions. */ +/* Called from RL_CHECK_SIGNALS() macro */ +RETSIGTYPE +_rl_signal_handler (sig) + int sig; +{ + _rl_caught_signal = 0; /* XXX */ + + _rl_handle_signal (sig); + SIGHANDLER_RETURN; +} + static RETSIGTYPE rl_signal_handler (sig) int sig; { + if (_rl_interrupt_immediately || RL_ISSTATE(RL_STATE_CALLBACK)) + { + _rl_interrupt_immediately = 0; + _rl_handle_signal (sig); + } + else + _rl_caught_signal = sig; + + SIGHANDLER_RETURN; +} + +static RETSIGTYPE +_rl_handle_signal (sig) + int sig; +{ #if defined (HAVE_POSIX_SIGNALS) sigset_t set; #else /* !HAVE_POSIX_SIGNALS */ @@ -142,6 +184,7 @@ rl_signal_handler (sig) switch (sig) { case SIGINT: + _rl_reset_completion_state (); rl_free_line_state (); /* FALLTHROUGH */ @@ -157,9 +200,11 @@ rl_signal_handler (sig) #if defined (SIGQUIT) case SIGQUIT: #endif + rl_echo_signal_char (sig); rl_cleanup_after_signal (); #if defined (HAVE_POSIX_SIGNALS) + sigemptyset (&set); sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set); sigdelset (&set, sig); #else /* !HAVE_POSIX_SIGNALS */ @@ -251,11 +296,11 @@ rl_set_sighandler (sig, handler, ohandler) struct sigaction act; act.sa_handler = handler; -#if defined (SIGWINCH) +# if defined (SIGWINCH) act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0; -#else +# else act.sa_flags = 0; -#endif +# endif /* SIGWINCH */ sigemptyset (&act.sa_mask); sigemptyset (&ohandler->sa_mask); sigaction (sig, &act, &old_handler); @@ -292,9 +337,44 @@ rl_set_signals () { sighandler_cxt dummy; SigHandler *oh; +#if defined (HAVE_POSIX_SIGNALS) + static int sigmask_set = 0; + static sigset_t bset, oset; +#endif + +#if defined (HAVE_POSIX_SIGNALS) + if (rl_catch_signals && sigmask_set == 0) + { + sigemptyset (&bset); + + sigaddset (&bset, SIGINT); + sigaddset (&bset, SIGTERM); +#if defined (SIGQUIT) + sigaddset (&bset, SIGQUIT); +#endif +#if defined (SIGALRM) + sigaddset (&bset, SIGALRM); +#endif +#if defined (SIGTSTP) + sigaddset (&bset, SIGTSTP); +#endif +#if defined (SIGTTIN) + sigaddset (&bset, SIGTTIN); +#endif +#if defined (SIGTTOU) + sigaddset (&bset, SIGTTOU); +#endif + sigmask_set = 1; + } +#endif /* HAVE_POSIX_SIGNALS */ if (rl_catch_signals && signals_set_flag == 0) { +#if defined (HAVE_POSIX_SIGNALS) + sigemptyset (&oset); + sigprocmask (SIG_BLOCK, &bset, &oset); +#endif + rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int); rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term); #if defined (SIGQUIT) @@ -328,6 +408,10 @@ rl_set_signals () #endif /* SIGTTIN */ signals_set_flag = 1; + +#if defined (HAVE_POSIX_SIGNALS) + sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); +#endif } #if defined (SIGWINCH) @@ -394,8 +478,8 @@ 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 (); + rl_clear_signals (); } /* Reset the terminal and readline state after a signal handler returns. */ @@ -428,3 +512,160 @@ rl_free_line_state () } #endif /* HANDLE_SIGNALS */ + +/* **************************************************************** */ +/* */ +/* SIGINT Management */ +/* */ +/* **************************************************************** */ + +#if defined (HAVE_POSIX_SIGNALS) +static sigset_t sigint_set, sigint_oset; +static sigset_t sigwinch_set, sigwinch_oset; +#else /* !HAVE_POSIX_SIGNALS */ +# if defined (HAVE_BSD_SIGNALS) +static int sigint_oldmask; +static int sigwinch_oldmask; +# endif /* HAVE_BSD_SIGNALS */ +#endif /* !HAVE_POSIX_SIGNALS */ + +static int sigint_blocked; +static int sigwinch_blocked; + +/* Cause SIGINT to not be delivered until the corresponding call to + release_sigint(). */ +void +_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; +} + +/* Allow SIGINT to be delivered. */ +void +_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; +} + +/* Cause SIGWINCH to not be delivered until the corresponding call to + release_sigwinch(). */ +void +_rl_block_sigwinch () +{ + if (sigwinch_blocked) + return; + +#if defined (HAVE_POSIX_SIGNALS) + sigemptyset (&sigwinch_set); + sigemptyset (&sigwinch_oset); + sigaddset (&sigwinch_set, SIGWINCH); + sigprocmask (SIG_BLOCK, &sigwinch_set, &sigwinch_oset); +#else /* !HAVE_POSIX_SIGNALS */ +# if defined (HAVE_BSD_SIGNALS) + sigwinch_oldmask = sigblock (sigmask (SIGWINCH)); +# else /* !HAVE_BSD_SIGNALS */ +# if defined (HAVE_USG_SIGHOLD) + sighold (SIGWINCH); +# endif /* HAVE_USG_SIGHOLD */ +# endif /* !HAVE_BSD_SIGNALS */ +#endif /* !HAVE_POSIX_SIGNALS */ + + sigwinch_blocked = 1; +} + +/* Allow SIGWINCH to be delivered. */ +void +_rl_release_sigwinch () +{ + if (sigwinch_blocked == 0) + return; + +#if defined (HAVE_POSIX_SIGNALS) + sigprocmask (SIG_SETMASK, &sigwinch_oset, (sigset_t *)NULL); +#else +# if defined (HAVE_BSD_SIGNALS) + sigsetmask (sigwinch_oldmask); +# else /* !HAVE_BSD_SIGNALS */ +# if defined (HAVE_USG_SIGHOLD) + sigrelse (SIGWINCH); +# endif /* HAVE_USG_SIGHOLD */ +# endif /* !HAVE_BSD_SIGNALS */ +#endif /* !HAVE_POSIX_SIGNALS */ + + sigwinch_blocked = 0; +} + +/* **************************************************************** */ +/* */ +/* Echoing special control characters */ +/* */ +/* **************************************************************** */ +void +rl_echo_signal_char (sig) + int sig; +{ + char cstr[3]; + int cslen, c; + + if (_rl_echoctl == 0 || _rl_echo_control_chars == 0) + return; + + switch (sig) + { + case SIGINT: c = _rl_intr_char; break; +#if defined (SIGQUIT) + case SIGQUIT: c = _rl_quit_char; break; +#endif +#if defined (SIGTSTP) + case SIGTSTP: c = _rl_susp_char; break; +#endif + default: return; + } + + if (CTRL_CHAR (c) || c == RUBOUT) + { + cstr[0] = '^'; + cstr[1] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; + cstr[cslen = 2] = '\0'; + } + else + { + cstr[0] = c; + cstr[cslen = 1] = '\0'; + } + + _rl_output_some_chars (cstr, cslen); +} |