1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test installing a signal handler before the Go code starts.
// This is a lot like misc/cgo/testcshared/main4.c.
#include <setjmp.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sched.h>
#include <time.h>
#include "libgo2.h"
static void die(const char* msg) {
perror(msg);
exit(EXIT_FAILURE);
}
static volatile sig_atomic_t sigioSeen;
// Use up some stack space.
static void recur(int i, char *p) {
char a[1024];
*p = '\0';
if (i > 0) {
recur(i - 1, a);
}
}
// Signal handler that uses up more stack space than a goroutine will have.
static void ioHandler(int signo, siginfo_t* info, void* ctxt) {
char a[1024];
recur(4, a);
sigioSeen = 1;
}
static jmp_buf jmp;
static char* nullPointer;
// Signal handler for SIGSEGV on a C thread.
static void segvHandler(int signo, siginfo_t* info, void* ctxt) {
sigset_t mask;
int i;
if (sigemptyset(&mask) < 0) {
die("sigemptyset");
}
if (sigaddset(&mask, SIGSEGV) < 0) {
die("sigaddset");
}
i = sigprocmask(SIG_UNBLOCK, &mask, NULL);
if (i != 0) {
fprintf(stderr, "sigprocmask: %s\n", strerror(i));
exit(EXIT_FAILURE);
}
// Don't try this at home.
longjmp(jmp, signo);
// We should never get here.
abort();
}
// Set up the signal handlers in a high priority constructor,
// so that they are installed before the Go code starts.
static void init(void) __attribute__ ((constructor (200)));
static void init() {
struct sigaction sa;
memset(&sa, 0, sizeof sa);
sa.sa_sigaction = ioHandler;
if (sigemptyset(&sa.sa_mask) < 0) {
die("sigemptyset");
}
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGIO, &sa, NULL) < 0) {
die("sigaction");
}
sa.sa_sigaction = segvHandler;
if (sigaction(SIGSEGV, &sa, NULL) < 0 || sigaction(SIGBUS, &sa, NULL) < 0) {
die("sigaction");
}
}
int main(int argc, char** argv) {
int verbose;
sigset_t mask;
int i;
verbose = argc > 1;
setvbuf(stdout, NULL, _IONBF, 0);
// Call setsid so that we can use kill(0, SIGIO) below.
// Don't check the return value so that this works both from
// a job control shell and from a shell script.
setsid();
if (verbose) {
printf("calling RunGoroutines\n");
}
RunGoroutines();
// Block SIGIO in this thread to make it more likely that it
// will be delivered to a goroutine.
if (verbose) {
printf("calling pthread_sigmask\n");
}
if (sigemptyset(&mask) < 0) {
die("sigemptyset");
}
if (sigaddset(&mask, SIGIO) < 0) {
die("sigaddset");
}
i = pthread_sigmask(SIG_BLOCK, &mask, NULL);
if (i != 0) {
fprintf(stderr, "pthread_sigmask: %s\n", strerror(i));
exit(EXIT_FAILURE);
}
if (verbose) {
printf("calling kill\n");
}
if (kill(0, SIGIO) < 0) {
die("kill");
}
if (verbose) {
printf("waiting for sigioSeen\n");
}
// Wait until the signal has been delivered.
i = 0;
while (!sigioSeen) {
if (sched_yield() < 0) {
perror("sched_yield");
}
i++;
if (i > 100000) {
fprintf(stderr, "looping too long waiting for signal\n");
exit(EXIT_FAILURE);
}
}
if (verbose) {
printf("calling setjmp\n");
}
// Test that a SIGSEGV on this thread is delivered to us.
if (setjmp(jmp) == 0) {
if (verbose) {
printf("triggering SIGSEGV\n");
}
*nullPointer = '\0';
fprintf(stderr, "continued after address error\n");
exit(EXIT_FAILURE);
}
if (verbose) {
printf("calling TestSEGV\n");
}
TestSEGV();
printf("PASS\n");
return 0;
}
|
