IABSD.fr/src/lib/libedit/sig.c

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• Author : schwarze
  Date : 2016-04-11 21:17:29
  Hash : ddc81437
  Message : delete the "private" and "public" preprocessor macros, just use standard C; OK martijn@

• lib/libedit/sig.c

• /*	$OpenBSD: sig.c,v 1.19 2016/04/11 21:17:29 schwarze Exp $	*/
  /*	$NetBSD: sig.c,v 1.25 2016/04/11 18:56:31 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 <errno.h>
  #include <stdlib.h>
  
  #include "el.h"
  #include "common.h"
  
  static EditLine *sel = NULL;
  
  static const int sighdl[] = {
  #define	_DO(a)	(a),
  	ALLSIGS
  #undef	_DO
  	- 1
  };
  
  static 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
   */
  static void
  sig_handler(int signo)
  {
  	int i, save_errno;
  	sigset_t nset, oset;
  
  	save_errno = errno;
  	(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);
  	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(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);
  }