lib/libedit/sig.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Christos Zoulas of Cornell University.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)sig.c    8.1 (Berkeley) 6/4/93
  33  * $NetBSD: sig.c,v 1.11 2003/08/07 16:44:33 agc Exp $
  34  * $DragonFly: src/lib/libedit/sig.c,v 1.4 2005/11/13 11:58:30 corecode Exp $
  35  */
  36
  37 #include "config.h"
  38
  39 /*
  40  * sig.c: Signal handling stuff.
  41  *        our policy is to trap all signals, set a good state
  42  *        and pass the ball to our caller.
  43  */
  44 #include "el.h"
  45 #include <stdlib.h>
  46
  47 private EditLine *sel = NULL;
  48
  49 private const int sighdl[] = {
  50 #define _DO(a)  (a),
  51         ALLSIGS
  52 #undef  _DO
  53         - 1
  54 };
  55
  56 private void sig_handler(int);
  57
  58 /* sig_handler():
  59  *      This is the handler called for all signals
  60  *      XXX: we cannot pass any data so we just store the old editline
  61  *      state in a private variable
  62  */
  63 private void
  64 sig_handler(int signo)
  65 {
  66         int i;
  67         sigset_t nset, oset;
  68
  69         (void) sigemptyset(&nset);
  70         (void) sigaddset(&nset, signo);
  71         (void) sigprocmask(SIG_BLOCK, &nset, &oset);
  72
  73         switch (signo) {
  74         case SIGCONT:
  75                 tty_rawmode(sel);
  76                 if (ed_redisplay(sel, 0) == CC_REFRESH)
  77                         re_refresh(sel);
  78                 term__flush();
  79                 break;
  80
  81         case SIGWINCH:
  82                 el_resize(sel);
  83                 break;
  84
  85         default:
  86                 tty_cookedmode(sel);
  87                 break;
  88         }
  89
  90         for (i = 0; sighdl[i] != -1; i++)
  91                 if (signo == sighdl[i])
  92                         break;
  93
  94         (void) signal(signo, sel->el_signal[i]);
  95         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
  96         (void) kill(0, signo);
  97 }
  98
  99
 100 /* sig_init():
 101  *      Initialize all signal stuff
 102  */
 103 protected int
 104 sig_init(EditLine *el)
 105 {
 106         int i;
 107         sigset_t nset, oset;
 108
 109         (void) sigemptyset(&nset);
 110 #define _DO(a) (void) sigaddset(&nset, a);
 111         ALLSIGS
 112 #undef  _DO
 113             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 114
 115 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(el_signalhandler_t))
 116
 117         el->el_signal = (el_signalhandler_t *) el_malloc(SIGSIZE);
 118         if (el->el_signal == NULL)
 119                 return (-1);
 120         for (i = 0; sighdl[i] != -1; i++)
 121                 el->el_signal[i] = SIG_ERR;
 122
 123         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 124
 125         return (0);
 126 }
 127
 128
 129 /* sig_end():
 130  *      Clear all signal stuff
 131  */
 132 protected void
 133 sig_end(EditLine *el)
 134 {
 135
 136         el_free((ptr_t) el->el_signal);
 137         el->el_signal = NULL;
 138 }
 139
 140
 141 /* sig_set():
 142  *      set all the signal handlers
 143  */
 144 protected void
 145 sig_set(EditLine *el)
 146 {
 147         int i;
 148         sigset_t nset, oset;
 149
 150         (void) sigemptyset(&nset);
 151 #define _DO(a) (void) sigaddset(&nset, a);
 152         ALLSIGS
 153 #undef  _DO
 154             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 155
 156         for (i = 0; sighdl[i] != -1; i++) {
 157                 el_signalhandler_t s;
 158                 /* This could happen if we get interrupted */
 159                 if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
 160                         el->el_signal[i] = s;
 161         }
 162         sel = el;
 163         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 164 }
 165
 166
 167 /* sig_clr():
 168  *      clear all the signal handlers
 169  */
 170 protected void
 171 sig_clr(EditLine *el)
 172 {
 173         int i;
 174         sigset_t nset, oset;
 175
 176         (void) sigemptyset(&nset);
 177 #define _DO(a) (void) sigaddset(&nset, a);
 178         ALLSIGS
 179 #undef  _DO
 180             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 181
 182         for (i = 0; sighdl[i] != -1; i++)
 183                 if (el->el_signal[i] != SIG_ERR)
 184                         (void) signal(sighdl[i], el->el_signal[i]);
 185
 186         sel = NULL;             /* we are going to die if the handler is
 187                                  * called */
 188         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 189 }