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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* Testcase checks, if setcontext(), swapcontext() restores signal-mask
and if pending signals are delivered after those calls.
Copyright (C) 2015-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
#include <ucontext.h>
#include <unistd.h>
volatile int global;
volatile sig_atomic_t handlerCalled;
static void
check (const char *funcName)
{
sigset_t set;
/* check if SIGUSR2 is unblocked after setcontext-call. */
sigprocmask (SIG_BLOCK, NULL, &set);
if (sigismember (&set, SIGUSR2) != 0)
{
printf ("FAIL: SIGUSR2 is blocked after %s.\n", funcName);
exit (1);
}
if (sigismember (&set, SIGUSR1) != 1)
{
printf ("FAIL: SIGUSR1 is not blocked after %s.\n", funcName);
exit (1);
}
}
static void
signalmask (int how, int signum)
{
sigset_t set;
sigemptyset (&set);
sigaddset (&set, signum);
if (sigprocmask (how, &set, NULL) != 0)
{
printf ("FAIL: sigprocmaks (%d, %d, NULL): %m\n", how, signum);
exit (1);
}
}
static void
signalpending (int signum, const char *msg)
{
sigset_t set;
sigemptyset (&set);
if (sigpending (&set) != 0)
{
printf ("FAIL: sigpending: %m\n");
exit (1);
}
if (sigismember (&set, SIGUSR2) != 1)
{
printf ("FAIL: Signal %d is not pending %s\n", signum, msg);
exit (1);
}
}
static void
handler (int __attribute__ ((unused)) signum)
{
handlerCalled ++;
}
static int
do_test (void)
{
ucontext_t ctx, oldctx;
struct sigaction action;
pid_t pid;
pid = getpid ();
/* unblock SIGUSR2 */
signalmask (SIG_UNBLOCK, SIGUSR2);
/* block SIGUSR1 */
signalmask (SIG_BLOCK, SIGUSR1);
/* register handler for SIGUSR2 */
action.sa_flags = 0;
action.sa_handler = handler;
sigemptyset (&action.sa_mask);
sigaction (SIGUSR2, &action, NULL);
if (getcontext (&ctx) != 0)
{
printf ("FAIL: getcontext: %m\n");
exit (1);
}
global++;
if (global == 1)
{
puts ("after getcontext");
/* block SIGUSR2 */
signalmask (SIG_BLOCK, SIGUSR2);
/* send SIGUSR2 to me */
handlerCalled = 0;
kill (pid, SIGUSR2);
/* was SIGUSR2 handler called? */
if (handlerCalled != 0)
{
puts ("FAIL: signal handler was called, but signal was blocked.");
exit (1);
}
/* is SIGUSR2 pending? */
signalpending (SIGUSR2, "before setcontext");
/* SIGUSR2 will be unblocked by setcontext-call. */
if (setcontext (&ctx) != 0)
{
printf ("FAIL: setcontext: %m\n");
exit (1);
}
}
else if (global == 2)
{
puts ("after setcontext");
/* check SIGUSR1/2 */
check ("setcontext");
/* was SIGUSR2 handler called? */
if (handlerCalled != 1)
{
puts ("FAIL: signal handler was not called after setcontext.");
exit (1);
}
/* block SIGUSR2 */
signalmask (SIG_BLOCK, SIGUSR2);
/* send SIGUSR2 to me */
handlerCalled = 0;
kill (pid, SIGUSR2);
/* was SIGUSR2 handler called? */
if (handlerCalled != 0)
{
puts ("FAIL: signal handler was called, but signal was blocked.");
exit (1);
}
/* is SIGUSR2 pending? */
signalpending (SIGUSR2, "before swapcontext");
if (swapcontext (&oldctx, &ctx) != 0)
{
printf ("FAIL: swapcontext: %m\n");
exit (1);
}
puts ("after returned from swapcontext");
if (global != 3)
{
puts ("FAIL: returned from swapcontext without ctx-context called.");
exit (1);
}
puts ("test succeeded");
return 0;
}
else if ( global != 3 )
{
puts ("FAIL: 'global' not incremented three times");
exit (1);
}
puts ("after swapcontext");
/* check SIGUSR1/2 */
check ("swapcontext");
/* was SIGUSR2 handler called? */
if (handlerCalled != 1)
{
puts ("FAIL: signal handler was not called after swapcontext.");
exit (1);
}
/* check sigmask in old context of swapcontext-call */
if (sigismember (&oldctx.uc_sigmask, SIGUSR2) != 1)
{
puts ("FAIL: SIGUSR2 is not blocked in oldctx.uc_sigmask.");
exit (1);
}
if (sigismember (&oldctx.uc_sigmask, SIGUSR1) != 1)
{
puts ("FAIL: SIGUSR1 is not blocked in oldctx.uc_sigmaks.");
exit (1);
}
/* change to old context, which was gathered by swapcontext() call. */
setcontext (&oldctx);
puts ("FAIL: returned from setcontext (&oldctx)");
exit (1);
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
GitWeb