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breaks.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1991-1995, 1998, 1999, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    Derived from a work
 *    Copyright (C) 1990 David I. Bell.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: Unix-specific routines to implement special actions.
 */

#include <ac/signal.h>
#include <ac/unistd.h>

#include <breaks.h>


static int breakflag;         /* TRUE if breaks are disabled */

#ifndef HAVE_SIGHOLD
#ifdef HAVE_SIGPROCMASK
static sigset_t oldsigs; 
#endif
#endif


/*
 * Function to disable signals during a critical section of code.
 * The signals are held until the critical section is done.
 */

void
breaksoff(void)
{
    if (breakflag)
      return;
    breakflag = 1;
#ifdef HAVE_SIGHOLD
    sighold(SIGHUP);
    sighold(SIGINT);
    sighold(SIGQUIT);
    sighold(SIGTERM);
#else
#ifdef HAVE_SIGPROCMASK
    {
      sigset_t    set;

      sigemptyset(&set);
      sigaddset(&set, SIGHUP);
      sigaddset(&set, SIGINT);
      sigaddset(&set, SIGQUIT);
      sigaddset(&set, SIGTERM);
      sigprocmask(SIG_BLOCK, &set, &oldsigs);
    }
#endif /* HAVE_SIGPROCMASK */
#endif /* !HAVE_SIGHOLD */
}


/*
 * Function to reenable signals when critical code is complete.
 */

void
breakson(void)
{
    if (!breakflag)
      return;
#ifdef HAVE_SIGHOLD
    sigrelse(SIGHUP);
    sigrelse(SIGINT);
    sigrelse(SIGQUIT);
    sigrelse(SIGTERM);
#else
#ifdef HAVE_SIGPROCMASK
    sigprocmask(SIG_SETMASK, &oldsigs, (sigset_t *)0);
#endif /* HAVE_SIGPROCMASK */
#endif /* !HAVE_SIGHOLD */
    breakflag = 0;
}

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