69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/***************************************************************************
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gbx_signal.c
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(c) 2000-2011 Benoît Minisini <gambas@users.sourceforge.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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***************************************************************************/
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#define __GBX_SIGNAL_C
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#include "gb_error.h"
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#include "gbx_signal.h"
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void SIGNAL_install(SIGNAL_HANDLER *handler, int signum, void (*callback)(int, siginfo_t *, void *))
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{
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struct sigaction action;
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action.sa_flags = SA_SIGINFO;
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sigemptyset(&action.sa_mask);
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action.sa_sigaction = callback;
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if (sigaction(signum, NULL, &handler->old_action) != 0)
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ERROR_panic("Cannot install signal handler: %s", strerror(errno));
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if (sigaction(signum, &action, NULL) != 0)
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ERROR_panic("Cannot install signal handler: %s", strerror(errno));
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handler->signum = signum;
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}
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void SIGNAL_uninstall(SIGNAL_HANDLER *handler)
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{
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if (sigaction(handler->signum, &handler->old_action, NULL) != 0)
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ERROR_panic("Cannot uninstall signal handler");
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}
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void SIGNAL_previous(SIGNAL_HANDLER *handler, int sig, siginfo_t *info, void *context)
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{
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if (handler->old_action.sa_handler != SIG_DFL && handler->old_action.sa_handler != SIG_IGN)
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{
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if (handler->old_action.sa_flags & SA_SIGINFO)
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{
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//fprintf(stderr, "Calling old action %p\n", _old_SIGCHLD_action.sa_sigaction);
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(*handler->old_action.sa_sigaction)(sig, info, context);
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}
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else
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{
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//fprintf(stderr, "Calling old handler %p\n", _old_SIGCHLD_action.sa_handler);
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(*handler->old_action.sa_handler)(sig);
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}
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}
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}
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