206 lines
5.1 KiB
C
206 lines
5.1 KiB
C
/* $NetBSD: sig.c,v 1.26 2016/05/09 21:46:56 christos Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Christos Zoulas of Cornell University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "config.h"
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#if !defined(lint) && !defined(SCCSID)
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#if 0
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static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: sig.c,v 1.26 2016/05/09 21:46:56 christos Exp $");
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#endif
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#endif /* not lint && not SCCSID */
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/*
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* sig.c: Signal handling stuff.
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* our policy is to trap all signals, set a good state
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* and pass the ball to our caller.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include "el.h"
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#include "common.h"
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static EditLine *sel = NULL;
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static const int sighdl[] = {
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#define _DO(a) (a),
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ALLSIGS
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#undef _DO
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- 1
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};
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static void sig_handler(int);
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/* sig_handler():
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* This is the handler called for all signals
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* XXX: we cannot pass any data so we just store the old editline
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* state in a private variable
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*/
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static void
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sig_handler(int signo)
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{
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int i, save_errno;
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sigset_t nset, oset;
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save_errno = errno;
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(void) sigemptyset(&nset);
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(void) sigaddset(&nset, signo);
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(void) sigprocmask(SIG_BLOCK, &nset, &oset);
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sel->el_signal->sig_no = signo;
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switch (signo) {
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case SIGCONT:
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tty_rawmode(sel);
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if (ed_redisplay(sel, 0) == CC_REFRESH)
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re_refresh(sel);
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terminal__flush(sel);
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break;
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case SIGWINCH:
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el_resize(sel);
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break;
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default:
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tty_cookedmode(sel);
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break;
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}
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for (i = 0; sighdl[i] != -1; i++)
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if (signo == sighdl[i])
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break;
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(void) sigaction(signo, &sel->el_signal->sig_action[i], NULL);
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sel->el_signal->sig_action[i].sa_handler = SIG_ERR;
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sel->el_signal->sig_action[i].sa_flags = 0;
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sigemptyset(&sel->el_signal->sig_action[i].sa_mask);
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(void) sigprocmask(SIG_SETMASK, &oset, NULL);
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(void) kill(0, signo);
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errno = save_errno;
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}
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/* sig_init():
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* Initialize all signal stuff
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*/
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libedit_private int
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sig_init(EditLine *el)
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{
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size_t i;
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sigset_t *nset, oset;
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el->el_signal = el_malloc(sizeof(*el->el_signal));
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if (el->el_signal == NULL)
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return -1;
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nset = &el->el_signal->sig_set;
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(void) sigemptyset(nset);
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#define _DO(a) (void) sigaddset(nset, a);
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ALLSIGS
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#undef _DO
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(void) sigprocmask(SIG_BLOCK, nset, &oset);
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for (i = 0; sighdl[i] != -1; i++) {
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el->el_signal->sig_action[i].sa_handler = SIG_ERR;
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el->el_signal->sig_action[i].sa_flags = 0;
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sigemptyset(&el->el_signal->sig_action[i].sa_mask);
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}
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(void) sigprocmask(SIG_SETMASK, &oset, NULL);
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return 0;
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}
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/* sig_end():
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* Clear all signal stuff
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*/
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libedit_private void
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sig_end(EditLine *el)
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{
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el_free(el->el_signal);
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el->el_signal = NULL;
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}
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/* sig_set():
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* set all the signal handlers
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*/
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libedit_private void
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sig_set(EditLine *el)
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{
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size_t i;
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sigset_t oset;
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struct sigaction osa, nsa;
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nsa.sa_handler = sig_handler;
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nsa.sa_flags = 0;
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sigemptyset(&nsa.sa_mask);
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(void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
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for (i = 0; sighdl[i] != -1; i++) {
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/* This could happen if we get interrupted */
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if (sigaction(sighdl[i], &nsa, &osa) != -1 &&
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osa.sa_handler != sig_handler)
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el->el_signal->sig_action[i] = osa;
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}
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sel = el;
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(void) sigprocmask(SIG_SETMASK, &oset, NULL);
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}
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/* sig_clr():
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* clear all the signal handlers
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*/
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libedit_private void
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sig_clr(EditLine *el)
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{
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size_t i;
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sigset_t oset;
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(void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
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for (i = 0; sighdl[i] != -1; i++)
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if (el->el_signal->sig_action[i].sa_handler != SIG_ERR)
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(void)sigaction(sighdl[i],
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&el->el_signal->sig_action[i], NULL);
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sel = NULL; /* we are going to die if the handler is
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* called */
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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}
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