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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: }