main/editline/sig.c

   1 /*      $NetBSD: sig.c,v 1.9 2002/03/18 16:00:58 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Christos Zoulas of Cornell University.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include "config.h"
  40 #if !defined(lint) && !defined(SCCSID)
  41 #if 0
  42 static char sccsid[] = "@(#)sig.c       8.1 (Berkeley) 6/4/93";
  43 #else
  44 __RCSID("$NetBSD: sig.c,v 1.9 2002/03/18 16:00:58 christos Exp $");
  45 #endif
  46 #endif /* not lint && not SCCSID */
  47
  48 /*
  49  * sig.c: Signal handling stuff.
  50  *        our policy is to trap all signals, set a good state
  51  *        and pass the ball to our caller.
  52  */
  53 #include "el.h"
  54 #include <stdlib.h>
  55
  56 private EditLine *sel = NULL;
  57
  58 private const int sighdl[] = {
  59 #define _DO(a)  (a),
  60         ALLSIGS
  61 #undef  _DO
  62         - 1
  63 };
  64
  65 private void sig_handler(int);
  66
  67 /* sig_handler():
  68  *      This is the handler called for all signals
  69  *      XXX: we cannot pass any data so we just store the old editline
  70  *      state in a private variable
  71  */
  72 private void
  73 sig_handler(int signo)
  74 {
  75         int i;
  76         sigset_t nset, oset;
  77
  78         (void) sigemptyset(&nset);
  79         (void) sigaddset(&nset, signo);
  80         (void) sigprocmask(SIG_BLOCK, &nset, &oset);
  81
  82         switch (signo) {
  83         case SIGCONT:
  84                 tty_rawmode(sel);
  85                 if (ed_redisplay(sel, 0) == CC_REFRESH)
  86                         re_refresh(sel);
  87                 term__flush();
  88                 break;
  89
  90         case SIGWINCH:
  91                 el_resize(sel);
  92                 break;
  93
  94         default:
  95                 tty_cookedmode(sel);
  96                 break;
  97         }
  98
  99         for (i = 0; sighdl[i] != -1; i++)
 100                 if (signo == sighdl[i])
 101                         break;
 102
 103         (void) signal(signo, sel->el_signal[i]);
 104         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 105         (void) kill(0, signo);
 106 }
 107
 108
 109 /* sig_init():
 110  *      Initialize all signal stuff
 111  */
 112 protected int
 113 sig_init(EditLine *el)
 114 {
 115         int i;
 116         sigset_t nset, oset;
 117
 118         (void) sigemptyset(&nset);
 119 #define _DO(a) (void) sigaddset(&nset, a);
 120         ALLSIGS
 121 #undef  _DO
 122             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 123
 124 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t))
 125
 126         el->el_signal = (sig_t *) el_malloc(SIGSIZE);
 127         if (el->el_signal == NULL)
 128                 return (-1);
 129         for (i = 0; sighdl[i] != -1; i++)
 130                 el->el_signal[i] = SIG_ERR;
 131
 132         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 133
 134         return (0);
 135 }
 136
 137
 138 /* sig_end():
 139  *      Clear all signal stuff
 140  */
 141 protected void
 142 sig_end(EditLine *el)
 143 {
 144
 145         el_free((ptr_t) el->el_signal);
 146         el->el_signal = NULL;
 147 }
 148
 149
 150 /* sig_set():
 151  *      set all the signal handlers
 152  */
 153 protected void
 154 sig_set(EditLine *el)
 155 {
 156         int i;
 157         sigset_t nset, oset;
 158
 159         (void) sigemptyset(&nset);
 160 #define _DO(a) (void) sigaddset(&nset, a);
 161         ALLSIGS
 162 #undef  _DO
 163             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 164
 165         for (i = 0; sighdl[i] != -1; i++) {
 166                 sig_t s;
 167                 /* This could happen if we get interrupted */
 168                 if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
 169                         el->el_signal[i] = s;
 170         }
 171         sel = el;
 172         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 173 }
 174
 175
 176 /* sig_clr():
 177  *      clear all the signal handlers
 178  */
 179 protected void
 180 sig_clr(EditLine *el)
 181 {
 182         int i;
 183         sigset_t nset, oset;
 184
 185         (void) sigemptyset(&nset);
 186 #define _DO(a) (void) sigaddset(&nset, a);
 187         ALLSIGS
 188 #undef  _DO
 189             (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 190
 191         for (i = 0; sighdl[i] != -1; i++)
 192                 if (el->el_signal[i] != SIG_ERR)
 193                         (void) signal(sighdl[i], el->el_signal[i]);
 194
 195         sel = NULL;             /* we are going to die if the handler is
 196                                  * called */
 197         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 198 }