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1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <prex/signal.h>
! 32:
! 33: #include <unistd.h>
! 34: #include <signal.h>
! 35: #include <stdlib.h>
! 36:
! 37: struct sigaction __sig_act[NSIG];
! 38: sigset_t __sig_mask;
! 39: sigset_t __sig_pending;
! 40:
! 41: #ifdef _REENTRANT
! 42: volatile mutex_t __sig_lock;
! 43: #endif
! 44:
! 45: /*
! 46: * Process all pending and unmasked signal
! 47: *
! 48: * return 0 if at least one pending signal was processed.
! 49: * return -1 if no signal was processed.
! 50: */
! 51: int
! 52: __sig_flush(void)
! 53: {
! 54: int sig;
! 55: sigset_t active, org_mask;
! 56: struct sigaction action;
! 57: struct siginfo si;
! 58: int rc = -1;
! 59:
! 60: sig = 1;
! 61: for (;;) {
! 62: SIGNAL_LOCK();
! 63: active = __sig_pending & ~__sig_mask;
! 64: action = __sig_act[sig];
! 65: SIGNAL_UNLOCK();
! 66:
! 67: if (active == 0)
! 68: break;
! 69: if (active & sigmask(sig)) {
! 70:
! 71: SIGNAL_LOCK();
! 72: org_mask = __sig_mask;
! 73: __sig_mask |= action.sa_mask;
! 74: SIGNAL_UNLOCK();
! 75:
! 76: if (action.sa_handler == SIG_DFL) {
! 77: /* Default */
! 78: switch (sig) {
! 79: case SIGCHLD:
! 80: /* XXX: */
! 81: break;
! 82: default:
! 83: exit(0);
! 84: }
! 85: } else if (action.sa_handler != SIG_IGN) {
! 86: /* User defined */
! 87: if (action.sa_flags & SA_SIGINFO) {
! 88: si.si_signo = sig;
! 89: si.si_code = 0;
! 90: si.si_value.sival_int = 0;
! 91: action.sa_sigaction(sig, &si, NULL);
! 92: } else {
! 93: action.sa_handler(sig);
! 94: }
! 95: }
! 96: SIGNAL_LOCK();
! 97: __sig_pending &= ~sigmask(sig);
! 98: __sig_mask = org_mask;
! 99: SIGNAL_UNLOCK();
! 100:
! 101: switch (sig) {
! 102: case SIGILL:
! 103: case SIGTRAP:
! 104: case SIGFPE:
! 105: case SIGSEGV:
! 106: for (;;); /* exception from kernel */
! 107: break;
! 108: }
! 109: if (action.sa_handler != SIG_IGN)
! 110: rc = 0; /* Signal is processed */
! 111: }
! 112:
! 113: if (++sig >= NSIG)
! 114: sig = 1;
! 115: }
! 116: return rc;
! 117: }
! 118:
! 119: /*
! 120: * Exception handler for signal emulation
! 121: */
! 122: static void
! 123: __exception_handler(int excpt, void *regs)
! 124: {
! 125:
! 126: if (excpt > 0 && excpt <= NSIG) {
! 127:
! 128: SIGNAL_LOCK();
! 129:
! 130: if (__sig_act[excpt].sa_handler != SIG_IGN)
! 131: __sig_pending |= sigmask(excpt);
! 132:
! 133: SIGNAL_UNLOCK();
! 134: }
! 135: __sig_flush();
! 136: exception_return(regs);
! 137: }
! 138:
! 139: /*
! 140: * Initialize exception
! 141: */
! 142: void
! 143: __exception_init(void)
! 144: {
! 145: int i;
! 146:
! 147: #ifdef _REENTRANT
! 148: mutex_init(&__sig_lock);
! 149: #endif
! 150: exception_setup(NULL);
! 151:
! 152: __sig_mask = 0;
! 153: __sig_pending = 0;
! 154:
! 155: for (i = 0; i < NSIG; i++) {
! 156: __sig_act[i].sa_flags = 0;
! 157: __sig_act[i].sa_handler = SIG_DFL;
! 158: }
! 159:
! 160: /* Install exception handler */
! 161: exception_setup(__exception_handler);
! 162: }
! 163:
! 164: /*
! 165: * Clean up
! 166: */
! 167: void
! 168: __exception_exit(void)
! 169: {
! 170:
! 171: #ifdef _REENTRANT
! 172: mutex_destroy(&__sig_lock);
! 173: #endif
! 174: exception_setup(NULL);
! 175: }