| 1 | /* signals.c -- signal handling support for readline. */
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| 2 |
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| 3 | /* Copyright (C) 1987-2005 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of the GNU Readline Library, a library for
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| 6 | reading lines of text with interactive input and history editing.
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| 7 |
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| 8 | The GNU Readline Library is free software; you can redistribute it
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| 9 | and/or modify it under the terms of the GNU General Public License
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| 10 | as published by the Free Software Foundation; either version 2, or
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| 11 | (at your option) any later version.
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| 12 |
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| 13 | The GNU Readline Library is distributed in the hope that it will be
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| 14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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| 15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | The GNU General Public License is often shipped with GNU software, and
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| 19 | is generally kept in a file called COPYING or LICENSE. If you do not
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| 20 | have a copy of the license, write to the Free Software Foundation,
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| 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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| 22 | #define READLINE_LIBRARY
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| 23 |
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| 24 | #if defined (HAVE_CONFIG_H)
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| 25 | # include <config.h>
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| 26 | #endif
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| 27 |
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| 28 | #include <stdio.h> /* Just for NULL. Yuck. */
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| 29 | #include <sys/types.h>
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| 30 | #include <signal.h>
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| 31 |
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| 32 | #if defined (HAVE_UNISTD_H)
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| 33 | # include <unistd.h>
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| 34 | #endif /* HAVE_UNISTD_H */
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| 35 |
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| 36 | /* System-specific feature definitions and include files. */
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| 37 | #include "rldefs.h"
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| 38 |
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| 39 | #if defined (GWINSZ_IN_SYS_IOCTL)
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| 40 | # include <sys/ioctl.h>
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| 41 | #endif /* GWINSZ_IN_SYS_IOCTL */
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| 42 |
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| 43 | #if defined (HANDLE_SIGNALS)
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| 44 | /* Some standard library routines. */
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| 45 | #include "readline.h"
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| 46 | #include "history.h"
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| 47 |
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| 48 | #include "rlprivate.h"
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| 49 |
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| 50 | #if !defined (RETSIGTYPE)
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| 51 | # if defined (VOID_SIGHANDLER)
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| 52 | # define RETSIGTYPE void
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| 53 | # else
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| 54 | # define RETSIGTYPE int
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| 55 | # endif /* !VOID_SIGHANDLER */
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| 56 | #endif /* !RETSIGTYPE */
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| 57 |
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| 58 | #if defined (VOID_SIGHANDLER)
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| 59 | # define SIGHANDLER_RETURN return
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| 60 | #else
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| 61 | # define SIGHANDLER_RETURN return (0)
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| 62 | #endif
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| 63 |
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| 64 | /* This typedef is equivalent to the one for Function; it allows us
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| 65 | to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
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| 66 | typedef RETSIGTYPE SigHandler ();
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| 67 |
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| 68 | #if defined (HAVE_POSIX_SIGNALS)
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| 69 | typedef struct sigaction sighandler_cxt;
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| 70 | # define rl_sigaction(s, nh, oh) sigaction(s, nh, oh)
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| 71 | #else
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| 72 | typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt;
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| 73 | # define sigemptyset(m)
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| 74 | #endif /* !HAVE_POSIX_SIGNALS */
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| 75 |
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| 76 | #ifndef SA_RESTART
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| 77 | # define SA_RESTART 0
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| 78 | #endif
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| 79 |
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| 80 | static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
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| 81 | static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
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| 82 |
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| 83 | /* Exported variables for use by applications. */
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| 84 |
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| 85 | /* If non-zero, readline will install its own signal handlers for
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| 86 | SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
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| 87 | int rl_catch_signals = 1;
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| 88 |
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| 89 | /* If non-zero, readline will install a signal handler for SIGWINCH. */
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| 90 | #ifdef SIGWINCH
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| 91 | int rl_catch_sigwinch = 1;
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| 92 | #else
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| 93 | int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */
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| 94 | #endif
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| 95 |
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| 96 | static int signals_set_flag;
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| 97 | static int sigwinch_set_flag;
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| 98 |
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| 99 | /* **************************************************************** */
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| 100 | /* */
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| 101 | /* Signal Handling */
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| 102 | /* */
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| 103 | /* **************************************************************** */
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| 104 |
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| 105 | static sighandler_cxt old_int, old_term, old_alrm, old_quit;
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| 106 | #if defined (SIGTSTP)
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| 107 | static sighandler_cxt old_tstp, old_ttou, old_ttin;
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| 108 | #endif
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| 109 | #if defined (SIGWINCH)
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| 110 | static sighandler_cxt old_winch;
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| 111 | #endif
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| 112 |
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| 113 | /* Readline signal handler functions. */
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| 114 |
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| 115 | static RETSIGTYPE
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| 116 | rl_signal_handler (sig)
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| 117 | int sig;
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| 118 | {
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| 119 | #if defined (HAVE_POSIX_SIGNALS)
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| 120 | sigset_t set;
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| 121 | #else /* !HAVE_POSIX_SIGNALS */
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| 122 | # if defined (HAVE_BSD_SIGNALS)
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| 123 | long omask;
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| 124 | # else /* !HAVE_BSD_SIGNALS */
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| 125 | sighandler_cxt dummy_cxt; /* needed for rl_set_sighandler call */
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| 126 | # endif /* !HAVE_BSD_SIGNALS */
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| 127 | #endif /* !HAVE_POSIX_SIGNALS */
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| 128 |
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| 129 | RL_SETSTATE(RL_STATE_SIGHANDLER);
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| 130 |
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| 131 | #if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS)
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| 132 | /* Since the signal will not be blocked while we are in the signal
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| 133 | handler, ignore it until rl_clear_signals resets the catcher. */
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| 134 | # if defined (SIGALRM)
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| 135 | if (sig == SIGINT || sig == SIGALRM)
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| 136 | # else
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| 137 | if (sig == SIGINT)
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| 138 | # endif
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| 139 | rl_set_sighandler (sig, SIG_IGN, &dummy_cxt);
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| 140 | #endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
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| 141 |
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| 142 | switch (sig)
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| 143 | {
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| 144 | case SIGINT:
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| 145 | rl_free_line_state ();
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| 146 | /* FALLTHROUGH */
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| 147 |
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| 148 | case SIGTERM:
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| 149 | #if defined (SIGTSTP)
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| 150 | case SIGTSTP:
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| 151 | case SIGTTOU:
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| 152 | case SIGTTIN:
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| 153 | #endif /* SIGTSTP */
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| 154 | #if defined (SIGALRM)
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| 155 | case SIGALRM:
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| 156 | #endif
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| 157 | #if defined (SIGQUIT)
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| 158 | case SIGQUIT:
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| 159 | #endif
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| 160 | rl_cleanup_after_signal ();
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| 161 |
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| 162 | #if defined (HAVE_POSIX_SIGNALS)
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| 163 | sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
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| 164 | sigdelset (&set, sig);
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| 165 | #else /* !HAVE_POSIX_SIGNALS */
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| 166 | # if defined (HAVE_BSD_SIGNALS)
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| 167 | omask = sigblock (0);
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| 168 | # endif /* HAVE_BSD_SIGNALS */
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| 169 | #endif /* !HAVE_POSIX_SIGNALS */
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| 170 |
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| 171 | #if defined (__EMX__)
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| 172 | signal (sig, SIG_ACK);
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| 173 | #endif
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| 174 |
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| 175 | #if defined (HAVE_KILL)
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| 176 | kill (getpid (), sig);
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| 177 | #else
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| 178 | raise (sig); /* assume we have raise */
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| 179 | #endif
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| 180 |
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| 181 | /* Let the signal that we just sent through. */
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| 182 | #if defined (HAVE_POSIX_SIGNALS)
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| 183 | sigprocmask (SIG_SETMASK, &set, (sigset_t *)NULL);
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| 184 | #else /* !HAVE_POSIX_SIGNALS */
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| 185 | # if defined (HAVE_BSD_SIGNALS)
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| 186 | sigsetmask (omask & ~(sigmask (sig)));
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| 187 | # endif /* HAVE_BSD_SIGNALS */
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| 188 | #endif /* !HAVE_POSIX_SIGNALS */
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| 189 |
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| 190 | rl_reset_after_signal ();
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| 191 | }
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| 192 |
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| 193 | RL_UNSETSTATE(RL_STATE_SIGHANDLER);
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| 194 | SIGHANDLER_RETURN;
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| 195 | }
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| 196 |
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| 197 | #if defined (SIGWINCH)
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| 198 | static RETSIGTYPE
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| 199 | rl_sigwinch_handler (sig)
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| 200 | int sig;
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| 201 | {
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| 202 | SigHandler *oh;
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| 203 |
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| 204 | #if defined (MUST_REINSTALL_SIGHANDLERS)
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| 205 | sighandler_cxt dummy_winch;
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| 206 |
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| 207 | /* We don't want to change old_winch -- it holds the state of SIGWINCH
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| 208 | disposition set by the calling application. We need this state
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| 209 | because we call the application's SIGWINCH handler after updating
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| 210 | our own idea of the screen size. */
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| 211 | rl_set_sighandler (SIGWINCH, rl_sigwinch_handler, &dummy_winch);
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| 212 | #endif
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| 213 |
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| 214 | RL_SETSTATE(RL_STATE_SIGHANDLER);
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| 215 | rl_resize_terminal ();
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| 216 |
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| 217 | /* If another sigwinch handler has been installed, call it. */
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| 218 | oh = (SigHandler *)old_winch.sa_handler;
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| 219 | if (oh && oh != (SigHandler *)SIG_IGN && oh != (SigHandler *)SIG_DFL)
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| 220 | (*oh) (sig);
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| 221 |
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| 222 | RL_UNSETSTATE(RL_STATE_SIGHANDLER);
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| 223 | SIGHANDLER_RETURN;
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| 224 | }
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| 225 | #endif /* SIGWINCH */
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| 226 |
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| 227 | /* Functions to manage signal handling. */
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| 228 |
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| 229 | #if !defined (HAVE_POSIX_SIGNALS)
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| 230 | static int
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| 231 | rl_sigaction (sig, nh, oh)
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| 232 | int sig;
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| 233 | sighandler_cxt *nh, *oh;
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| 234 | {
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| 235 | oh->sa_handler = signal (sig, nh->sa_handler);
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| 236 | return 0;
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| 237 | }
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| 238 | #endif /* !HAVE_POSIX_SIGNALS */
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| 239 |
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| 240 | /* Set up a readline-specific signal handler, saving the old signal
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| 241 | information in OHANDLER. Return the old signal handler, like
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| 242 | signal(). */
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| 243 | static SigHandler *
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| 244 | rl_set_sighandler (sig, handler, ohandler)
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| 245 | int sig;
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| 246 | SigHandler *handler;
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| 247 | sighandler_cxt *ohandler;
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| 248 | {
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| 249 | sighandler_cxt old_handler;
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| 250 | #if defined (HAVE_POSIX_SIGNALS)
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| 251 | struct sigaction act;
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| 252 |
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| 253 | act.sa_handler = handler;
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| 254 | act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
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| 255 | sigemptyset (&act.sa_mask);
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| 256 | sigemptyset (&ohandler->sa_mask);
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| 257 | sigaction (sig, &act, &old_handler);
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| 258 | #else
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| 259 | old_handler.sa_handler = (SigHandler *)signal (sig, handler);
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| 260 | #endif /* !HAVE_POSIX_SIGNALS */
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| 261 |
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| 262 | /* XXX -- assume we have memcpy */
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| 263 | /* If rl_set_signals is called twice in a row, don't set the old handler to
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| 264 | rl_signal_handler, because that would cause infinite recursion. */
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| 265 | if (handler != rl_signal_handler || old_handler.sa_handler != rl_signal_handler)
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| 266 | memcpy (ohandler, &old_handler, sizeof (sighandler_cxt));
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| 267 |
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| 268 | return (ohandler->sa_handler);
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| 269 | }
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| 270 |
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| 271 | static void
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| 272 | rl_maybe_set_sighandler (sig, handler, ohandler)
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| 273 | int sig;
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| 274 | SigHandler *handler;
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| 275 | sighandler_cxt *ohandler;
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| 276 | {
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| 277 | sighandler_cxt dummy;
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| 278 | SigHandler *oh;
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| 279 |
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| 280 | sigemptyset (&dummy.sa_mask);
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| 281 | oh = rl_set_sighandler (sig, handler, ohandler);
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| 282 | if (oh == (SigHandler *)SIG_IGN)
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| 283 | rl_sigaction (sig, ohandler, &dummy);
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| 284 | }
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| 285 |
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| 286 | int
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| 287 | rl_set_signals ()
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| 288 | {
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| 289 | sighandler_cxt dummy;
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| 290 | SigHandler *oh;
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| 291 |
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| 292 | if (rl_catch_signals && signals_set_flag == 0)
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| 293 | {
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| 294 | rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
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| 295 | rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
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| 296 | #if defined (SIGQUIT)
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| 297 | rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
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| 298 | #endif
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| 299 |
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| 300 | #if defined (SIGALRM)
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| 301 | oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
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| 302 | if (oh == (SigHandler *)SIG_IGN)
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| 303 | rl_sigaction (SIGALRM, &old_alrm, &dummy);
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| 304 | #if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART)
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| 305 | /* If the application using readline has already installed a signal
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| 306 | handler with SA_RESTART, SIGALRM will cause reads to be restarted
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| 307 | automatically, so readline should just get out of the way. Since
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| 308 | we tested for SIG_IGN above, we can just test for SIG_DFL here. */
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| 309 | if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
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| 310 | rl_sigaction (SIGALRM, &old_alrm, &dummy);
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| 311 | #endif /* HAVE_POSIX_SIGNALS */
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| 312 | #endif /* SIGALRM */
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| 313 |
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| 314 | #if defined (SIGTSTP)
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| 315 | rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
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| 316 | #endif /* SIGTSTP */
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| 317 |
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| 318 | #if defined (SIGTTOU)
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| 319 | rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
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| 320 | #endif /* SIGTTOU */
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| 321 |
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| 322 | #if defined (SIGTTIN)
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| 323 | rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
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| 324 | #endif /* SIGTTIN */
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| 325 |
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| 326 | signals_set_flag = 1;
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| 327 | }
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| 328 |
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| 329 | #if defined (SIGWINCH)
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| 330 | if (rl_catch_sigwinch && sigwinch_set_flag == 0)
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| 331 | {
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| 332 | rl_maybe_set_sighandler (SIGWINCH, rl_sigwinch_handler, &old_winch);
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| 333 | sigwinch_set_flag = 1;
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| 334 | }
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| 335 | #endif /* SIGWINCH */
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| 336 |
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| 337 | return 0;
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| 338 | }
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| 339 |
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| 340 | int
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| 341 | rl_clear_signals ()
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| 342 | {
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| 343 | sighandler_cxt dummy;
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| 344 |
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| 345 | if (rl_catch_signals && signals_set_flag == 1)
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| 346 | {
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| 347 | sigemptyset (&dummy.sa_mask);
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| 348 |
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| 349 | rl_sigaction (SIGINT, &old_int, &dummy);
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| 350 | rl_sigaction (SIGTERM, &old_term, &dummy);
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| 351 | #if defined (SIGQUIT)
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| 352 | rl_sigaction (SIGQUIT, &old_quit, &dummy);
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| 353 | #endif
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| 354 | #if defined (SIGALRM)
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| 355 | rl_sigaction (SIGALRM, &old_alrm, &dummy);
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| 356 | #endif
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| 357 |
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| 358 | #if defined (SIGTSTP)
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| 359 | rl_sigaction (SIGTSTP, &old_tstp, &dummy);
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| 360 | #endif /* SIGTSTP */
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| 361 |
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| 362 | #if defined (SIGTTOU)
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| 363 | rl_sigaction (SIGTTOU, &old_ttou, &dummy);
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| 364 | #endif /* SIGTTOU */
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| 365 |
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| 366 | #if defined (SIGTTIN)
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| 367 | rl_sigaction (SIGTTIN, &old_ttin, &dummy);
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| 368 | #endif /* SIGTTIN */
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| 369 |
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| 370 | signals_set_flag = 0;
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| 371 | }
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| 372 |
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| 373 | #if defined (SIGWINCH)
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| 374 | if (rl_catch_sigwinch && sigwinch_set_flag == 1)
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| 375 | {
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| 376 | sigemptyset (&dummy.sa_mask);
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| 377 | rl_sigaction (SIGWINCH, &old_winch, &dummy);
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| 378 | sigwinch_set_flag = 0;
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| 379 | }
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| 380 | #endif
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| 381 |
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| 382 | return 0;
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| 383 | }
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| 384 |
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| 385 | /* Clean up the terminal and readline state after catching a signal, before
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| 386 | resending it to the calling application. */
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| 387 | void
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| 388 | rl_cleanup_after_signal ()
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| 389 | {
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| 390 | _rl_clean_up_for_exit ();
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| 391 | if (rl_deprep_term_function)
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| 392 | (*rl_deprep_term_function) ();
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| 393 | rl_clear_signals ();
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| 394 | rl_clear_pending_input ();
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| 395 | }
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| 396 |
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| 397 | /* Reset the terminal and readline state after a signal handler returns. */
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| 398 | void
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| 399 | rl_reset_after_signal ()
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| 400 | {
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| 401 | if (rl_prep_term_function)
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| 402 | (*rl_prep_term_function) (_rl_meta_flag);
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| 403 | rl_set_signals ();
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| 404 | }
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| 405 |
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| 406 | /* Free up the readline variable line state for the current line (undo list,
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| 407 | any partial history entry, any keyboard macros in progress, and any
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| 408 | numeric arguments in process) after catching a signal, before calling
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| 409 | rl_cleanup_after_signal(). */
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| 410 | void
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| 411 | rl_free_line_state ()
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| 412 | {
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| 413 | register HIST_ENTRY *entry;
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| 414 |
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| 415 | rl_free_undo_list ();
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| 416 |
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| 417 | entry = current_history ();
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| 418 | if (entry)
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| 419 | entry->data = (char *)NULL;
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| 420 |
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| 421 | _rl_kill_kbd_macro ();
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| 422 | rl_clear_message ();
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| 423 | _rl_reset_argument ();
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| 424 | }
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| 425 |
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| 426 | #endif /* HANDLE_SIGNALS */
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