106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
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/*
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* Emulation of Linux signal handling
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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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 of the License, or
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* (at your option) any later version.
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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <signal.h>
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#include <sys/ucontext.h>
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/* Algorithm strongly inspired from em86 : we queue the signals so
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that we can handle them at precise points in the emulated code. */
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struct emulated_sigaction {
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struct target_sigaction sa;
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int nb_pending;
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struct target_siginfo info;
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};
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struct emulated_sigaction sigact_table[NSIG];
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int signal_pending;
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static inline int host_to_target_signal(int sig)
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{
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return sig;
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}
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static inline int target_to_host_signal(int sig)
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{
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return sig;
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}
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void signal_init(void)
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{
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struct sigaction act;
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int i;
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/* set all host signal handlers */
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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act.sa_sigaction = host_signal_handler;
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for(i = 1; i < NSIG; i++) {
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sigaction(i, &sa, NULL);
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}
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memset(sigact_table, 0, sizeof(sigact_table));
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}
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static void host_signal_handler(int host_signum, siginfo_t *info,
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void *puc)
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{
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struct ucontext *uc = puc;
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int signum;
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/* get target signal number */
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signum = host_to_target(host_signum);
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if (signum >= TARGET_NSIG)
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return;
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/* we save the old mask */
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}
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void process_pending_signals(void)
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{
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int signum;
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target_ulong _sa_handler;
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struct emulated_sigaction *esig;
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if (!signal_pending)
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return;
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esig = sigact_table;
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for(signum = 1; signum < TARGET_NSIG; signum++) {
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if (esig->nb_pending != 0)
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goto handle_signal;
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esig++;
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}
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/* if no signal is pending, just return */
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signal_pending = 0;
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return;
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handle_signal:
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_sa_handler = esig->sa._sa_handler;
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if (_sa_handler == TARGET_SIG_DFL) {
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/* default handling
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}
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}
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