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deb-goldedplus/goldlib/gall/gsigunix.cpp
2000-02-25 10:15:17 +00:00

83 lines
2.5 KiB
C++

// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA 02111-1307, USA
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// Unix signal functions. Based on SLang source.
// ------------------------------------------------------------------
#include <signal.h>
#include <unistd.h>
#include <gsigunix.h>
// ------------------------------------------------------------------
// We are primarily interested in blocking signals that would cause
// the application to reset the tty. These include suspend signals
// and possibly interrupt signals.
static sigset_t gsig_old_signal_mask;
static volatile uint gsig_blocked_depth;
// ------------------------------------------------------------------
int gsig_block_signals() {
sigset_t new_mask;
gsig_blocked_depth++;
if(gsig_blocked_depth != 1)
return 0;
sigemptyset(&new_mask);
sigaddset(&new_mask, SIGINT);
sigaddset(&new_mask, SIGQUIT);
#ifdef SIGTSTP
sigaddset(&new_mask, SIGTSTP);
sigaddset(&new_mask, SIGTTIN);
sigaddset(&new_mask, SIGTTOU);
#endif
sigprocmask(SIG_BLOCK, &new_mask, &gsig_old_signal_mask);
return 0;
}
// ------------------------------------------------------------------
int gsig_unblock_signals() {
if(gsig_blocked_depth == 0)
return -1;
gsig_blocked_depth--;
if(gsig_blocked_depth != 0)
return 0;
sigprocmask(SIG_SETMASK, &gsig_old_signal_mask, NULL);
return 0;
}
// ------------------------------------------------------------------