83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
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// This may look like C code, but it is really -*- C++ -*-
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// ------------------------------------------------------------------
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// The Goldware Library
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// Copyright (C) 1990-1999 Odinn Sorensen
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// ------------------------------------------------------------------
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this program; if not, write to the Free
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// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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// MA 02111-1307, USA
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// ------------------------------------------------------------------
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// $Id$
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// ------------------------------------------------------------------
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// Unix signal functions. Based on SLang source.
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// ------------------------------------------------------------------
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#include <signal.h>
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#include <unistd.h>
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#include <gsigunix.h>
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// ------------------------------------------------------------------
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// We are primarily interested in blocking signals that would cause
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// the application to reset the tty. These include suspend signals
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// and possibly interrupt signals.
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static sigset_t gsig_old_signal_mask;
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static volatile uint gsig_blocked_depth;
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// ------------------------------------------------------------------
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int gsig_block_signals() {
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sigset_t new_mask;
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gsig_blocked_depth++;
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if(gsig_blocked_depth != 1)
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return 0;
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sigemptyset(&new_mask);
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sigaddset(&new_mask, SIGINT);
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sigaddset(&new_mask, SIGQUIT);
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#ifdef SIGTSTP
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sigaddset(&new_mask, SIGTSTP);
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sigaddset(&new_mask, SIGTTIN);
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sigaddset(&new_mask, SIGTTOU);
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#endif
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sigprocmask(SIG_BLOCK, &new_mask, &gsig_old_signal_mask);
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return 0;
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}
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// ------------------------------------------------------------------
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int gsig_unblock_signals() {
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if(gsig_blocked_depth == 0)
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return -1;
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gsig_blocked_depth--;
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if(gsig_blocked_depth != 0)
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return 0;
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sigprocmask(SIG_SETMASK, &gsig_old_signal_mask, NULL);
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return 0;
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}
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// ------------------------------------------------------------------
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