| /* $NetBSD: sig.c,v 1.17 2011/07/28 20:50:55 christos Exp $ */ |
| |
| /*- |
| * Copyright (c) 1992, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Christos Zoulas of Cornell University. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #if !defined(lint) && !defined(SCCSID) |
| #if 0 |
| static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; |
| #else |
| __RCSID("$NetBSD: sig.c,v 1.17 2011/07/28 20:50:55 christos Exp $"); |
| #endif |
| #endif /* not lint && not SCCSID */ |
| |
| /* |
| * sig.c: Signal handling stuff. |
| * our policy is to trap all signals, set a good state |
| * and pass the ball to our caller. |
| */ |
| #include "el.h" |
| #include <stdlib.h> |
| |
| private EditLine *sel = NULL; |
| |
| private const int sighdl[] = { |
| #define _DO(a) (a), |
| ALLSIGS |
| #undef _DO |
| - 1 |
| }; |
| |
| private void sig_handler(int); |
| |
| /* sig_handler(): |
| * This is the handler called for all signals |
| * XXX: we cannot pass any data so we just store the old editline |
| * state in a private variable |
| */ |
| private void |
| sig_handler(int signo) |
| { |
| int i; |
| sigset_t nset, oset; |
| |
| (void) sigemptyset(&nset); |
| (void) sigaddset(&nset, signo); |
| (void) sigprocmask(SIG_BLOCK, &nset, &oset); |
| |
| sel->el_signal->sig_no = signo; |
| |
| switch (signo) { |
| case SIGCONT: |
| tty_rawmode(sel); |
| if (ed_redisplay(sel, 0) == CC_REFRESH) |
| re_refresh(sel); |
| terminal__flush(sel); |
| break; |
| |
| case SIGWINCH: |
| el_resize(sel); |
| break; |
| |
| default: |
| tty_cookedmode(sel); |
| break; |
| } |
| |
| for (i = 0; sighdl[i] != -1; i++) |
| if (signo == sighdl[i]) |
| break; |
| |
| (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); |
| sel->el_signal->sig_action[i].sa_handler = SIG_ERR; |
| sel->el_signal->sig_action[i].sa_flags = 0; |
| sigemptyset(&sel->el_signal->sig_action[i].sa_mask); |
| (void) sigprocmask(SIG_SETMASK, &oset, NULL); |
| (void) kill(0, signo); |
| } |
| |
| |
| /* sig_init(): |
| * Initialize all signal stuff |
| */ |
| protected int |
| sig_init(EditLine *el) |
| { |
| size_t i; |
| sigset_t *nset, oset; |
| |
| el->el_signal = el_malloc(sizeof(*el->el_signal)); |
| if (el->el_signal == NULL) |
| return -1; |
| |
| nset = &el->el_signal->sig_set; |
| (void) sigemptyset(nset); |
| #define _DO(a) (void) sigaddset(nset, a); |
| ALLSIGS |
| #undef _DO |
| (void) sigprocmask(SIG_BLOCK, nset, &oset); |
| |
| for (i = 0; sighdl[i] != -1; i++) { |
| el->el_signal->sig_action[i].sa_handler = SIG_ERR; |
| el->el_signal->sig_action[i].sa_flags = 0; |
| sigemptyset(&el->el_signal->sig_action[i].sa_mask); |
| } |
| |
| (void) sigprocmask(SIG_SETMASK, &oset, NULL); |
| |
| return 0; |
| } |
| |
| |
| /* sig_end(): |
| * Clear all signal stuff |
| */ |
| protected void |
| sig_end(EditLine *el) |
| { |
| |
| el_free(el->el_signal); |
| el->el_signal = NULL; |
| } |
| |
| |
| /* sig_set(): |
| * set all the signal handlers |
| */ |
| protected void |
| sig_set(EditLine *el) |
| { |
| size_t i; |
| sigset_t oset; |
| struct sigaction osa, nsa; |
| |
| nsa.sa_handler = sig_handler; |
| nsa.sa_flags = 0; |
| sigemptyset(&nsa.sa_mask); |
| |
| (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); |
| |
| for (i = 0; sighdl[i] != -1; i++) { |
| /* This could happen if we get interrupted */ |
| if (sigaction(sighdl[i], &nsa, &osa) != -1 && |
| osa.sa_handler != sig_handler) |
| el->el_signal->sig_action[i] = osa; |
| } |
| sel = el; |
| (void) sigprocmask(SIG_SETMASK, &oset, NULL); |
| } |
| |
| |
| /* sig_clr(): |
| * clear all the signal handlers |
| */ |
| protected void |
| sig_clr(EditLine *el) |
| { |
| size_t i; |
| sigset_t oset; |
| |
| (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); |
| |
| for (i = 0; sighdl[i] != -1; i++) |
| if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) |
| (void)sigaction(sighdl[i], |
| &el->el_signal->sig_action[i], NULL); |
| |
| sel = NULL; /* we are going to die if the handler is |
| * called */ |
| (void)sigprocmask(SIG_SETMASK, &oset, NULL); |
| } |