root / prex-0.9.0 / usr / lib / posix / signal / __exception.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/prex.h> |
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#include <sys/signal.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include <stdlib.h> |
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void __exception_init(void); |
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void __exception_exit(int *); |
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static int __sig_exit; |
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struct sigaction __sig_act[NSIG];
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sigset_t __sig_mask; |
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sigset_t __sig_pending; |
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#ifdef _REENTRANT
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volatile mutex_t __sig_lock;
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#endif
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/*
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* Process all pending and unmasked signal
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*
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* return 0 if at least one pending signal was processed.
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* return -1 if no signal was processed.
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*/
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int
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__sig_flush(void)
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{ |
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int sig;
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sigset_t active, org_mask; |
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struct sigaction action;
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struct siginfo si;
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int rc = -1; |
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sig = 1;
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for (;;) {
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SIGNAL_LOCK(); |
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active = __sig_pending & ~__sig_mask; |
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action = __sig_act[sig]; |
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SIGNAL_UNLOCK(); |
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if (active == 0) |
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break;
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if (active & sigmask(sig)) {
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SIGNAL_LOCK(); |
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org_mask = __sig_mask; |
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__sig_mask |= action.sa_mask; |
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SIGNAL_UNLOCK(); |
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if (action.sa_handler == SIG_DFL) {
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/* Default */
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switch (sig) {
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case SIGCHLD:
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case SIGTSTP:
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/* XXX: */
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break;
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default:
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SIGNAL_LOCK(); |
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__sig_pending &= ~sigmask(sig); |
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__sig_mask = org_mask; |
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__sig_exit = sig; |
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SIGNAL_UNLOCK(); |
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exit(0);
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} |
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} else if (action.sa_handler != SIG_IGN) { |
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/* User defined */
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if (action.sa_flags & SA_SIGINFO) {
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si.si_signo = sig; |
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si.si_code = 0;
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si.si_value.sival_int = 0;
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action.sa_sigaction(sig, &si, NULL);
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} else {
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action.sa_handler(sig); |
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} |
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} |
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SIGNAL_LOCK(); |
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__sig_pending &= ~sigmask(sig); |
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__sig_mask = org_mask; |
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SIGNAL_UNLOCK(); |
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switch (sig) {
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case SIGILL:
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case SIGTRAP:
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case SIGFPE:
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case SIGSEGV:
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for (;;); /* exception from kernel */ |
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break;
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} |
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if (action.sa_handler != SIG_IGN)
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rc = 0; /* Signal is processed */ |
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} |
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if (++sig >= NSIG)
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sig = 1;
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} |
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return rc;
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} |
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/*
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* Exception handler for signal emulation
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*/
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static void |
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__exception_handler(int excpt)
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{ |
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if (excpt > 0 && excpt <= NSIG) { |
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SIGNAL_LOCK(); |
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if (__sig_act[excpt].sa_handler != SIG_IGN)
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__sig_pending |= sigmask(excpt); |
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SIGNAL_UNLOCK(); |
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} |
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__sig_flush(); |
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exception_return(); |
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} |
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/*
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* Initialize exception
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*/
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void
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__exception_init(void)
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{ |
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int i;
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#ifdef _REENTRANT
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mutex_init(&__sig_lock); |
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#endif
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exception_setup(EXC_DFL); |
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__sig_mask = 0;
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__sig_pending = 0;
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__sig_exit = 0;
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for (i = 0; i < NSIG; i++) { |
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__sig_act[i].sa_flags = 0;
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__sig_act[i].sa_handler = SIG_DFL; |
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} |
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/* Install exception handler */
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exception_setup(__exception_handler); |
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} |
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/*
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* Clean up
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*/
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void
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__exception_exit(int *signo)
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{ |
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#ifdef _REENTRANT
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mutex_destroy(&__sig_lock); |
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#endif
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exception_setup(EXC_DFL); |
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*signo = __sig_exit; |
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__sig_exit = 0;
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__sig_pending = 0;
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} |