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/* $OpenBSD: sig.c,v 1.14 2014/10/17 06:07:50 deraadt Exp $ */
/* $NetBSD: sig.c,v 1.15 2009/02/19 15:20:22 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"
/*
* 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, save_errno = errno;
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);
term__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);
errno = save_errno;
}
/* sig_init():
* Initialize all signal stuff
*/
protected int
sig_init(EditLine *el)
{
size_t i;
sigset_t *nset, oset;
el->el_signal = 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)
{
free((ptr_t) 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);
}
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