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2000-04-30 Garry R. Osgood <gosgood@idt.net> * app/main.c * libgimp/gimpsignal.c [Documentation only] Patches arising from Tim Mooney to fix #2742 which should (hopefully) die at this point. removes on_sig_chld() from app/main() which offers no meaningful functionality in light of SA_NOCHLDSTOP.
79 lines
3.3 KiB
C
79 lines
3.3 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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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 Lesser 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 Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* $Revision$
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*/
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#include "gimpsignal.h"
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/* Courtesy of Austin Donnelly 06-04-2000 to address bug #2742 */
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/**
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* gimp_signal_private:
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* @signum: selects signal to be handled see man 5 signal
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* @gimp_sighandler: handler that maps to signum. Invoked by O/S.
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* handler gets signal that caused invocation.
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* @sa_flags: preferences. OR'ed SA_<xxx>. See signal.h
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*
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* This function furnishes a workalike for signal(2) but
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* which internally invokes sigaction(2) after certain
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* sa_flags are set; these primarily to ensure restarting
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* of interrupted system calls. See sigaction(2) It is a
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* aid to transition and not new development: that effort
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* should employ sigaction directly. [gosgood 18.04.2000]
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*
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* Cause handler to be run when signum is delivered. We
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* use sigaction(2) rather than signal(2) so that we can control the
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* signal hander's environment completely via sa_flags: some signal(2)
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* implementations differ in their sematics, so we need to nail down
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* exactly what we want. [austin 06.04.2000]
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*
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* Returns: a reference to a signal handling function
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*/
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GimpRetSigType
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gimp_signal_private (gint signum, void (*gimp_sighandler)(int), gint sa_flags)
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{
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int ret;
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struct sigaction sa;
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struct sigaction osa;
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/* The sa_handler (mandated by POSIX.1) and sa_sigaction (a */
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/* common extension) are often implemented by the OS as members */
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/* of a union. This means you CAN NOT set both, you set one or */
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/* the other. Caveat programmer! */
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/* Passing gimp_signal_private a gimp_sighandler of NULL is not */
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/* an error, and generally results in the action for that signal */
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/* being set to SIG_DFL (default behavior). Many OSes define */
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/* SIG_DFL as (void (*)()0, so setting sa_handler to NULL is */
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/* the same thing as passing SIG_DFL to it. */
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sa.sa_handler = gimp_sighandler;
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/* Mask all signals while handler runs to avoid re-entrancy
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* problems. */
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sigfillset (&sa.sa_mask);
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sa.sa_flags = sa_flags;
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ret = sigaction (signum, &sa, &osa);
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if (ret < 0)
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g_error ("unable to set handler for signal %d\n", signum);
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return osa.sa_handler;
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}
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