1 /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <pthread.h>
19 #include <signal.h>
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24
25
26 #ifdef SIGRTMIN
27
28 # define N 2
29 static pthread_barrier_t bar;
30 static struct
31 {
32 void *p;
33 pthread_t s;
34 } ti[N];
35 static int sig1;
36
37
38 static void
39 handler (int sig)
40 {
41 pthread_t self = pthread_self ();
42 size_t i;
43
44 for (i = 0; i < N; ++i)
45 if (ti[i].s == self)
46 {
47 if ((uintptr_t) ti[i].p <= (uintptr_t) &self
48 && (uintptr_t) ti[i].p + 2 * MINSIGSTKSZ > (uintptr_t) &self)
49 {
50 puts ("alt stack not used");
51 exit (1);
52 }
53
54 printf ("thread %zu used alt stack for signal %d\n", i, sig);
55
56 return;
57 }
58
59 puts ("handler: thread not found");
60 exit (1);
61 }
62
63
64 static void *
65 tf (void *arg)
66 {
67 size_t nr = (uintptr_t) arg;
68 if (nr >= N)
69 {
70 puts ("wrong nr parameter");
71 exit (1);
72 }
73
74 sigset_t ss;
75 sigemptyset (&ss);
76 size_t i;
77 for (i = 0; i < N; ++i)
78 if (i != nr)
79 if (sigaddset (&ss, sig1 + i) != 0)
80 {
81 puts ("tf: sigaddset failed");
82 exit (1);
83 }
84 if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)
85 {
86 puts ("tf: sigmask failed");
87 exit (1);
88 }
89
90 void *p = malloc (2 * MINSIGSTKSZ);
91 if (p == NULL)
92 {
93 puts ("tf: malloc failed");
94 exit (1);
95 }
96
97 stack_t s;
98 s.ss_sp = p;
99 s.ss_size = 2 * MINSIGSTKSZ;
100 s.ss_flags = 0;
101 if (sigaltstack (&s, NULL) != 0)
102 {
103 puts ("tf: sigaltstack failed");
104 exit (1);
105 }
106
107 ti[nr].p = p;
108 ti[nr].s = pthread_self ();
109
110 pthread_barrier_wait (&bar);
111
112 pthread_barrier_wait (&bar);
113
114 return NULL;
115 }
116
117
118 static int
119 do_test (void)
120 {
121 sig1 = SIGRTMIN;
122 if (sig1 + N > SIGRTMAX)
123 {
124 puts ("too few RT signals");
125 return 0;
126 }
127
128 struct sigaction sa;
129 sa.sa_handler = handler;
130 sa.sa_flags = 0;
131 sigemptyset (&sa.sa_mask);
132
133 if (sigaction (sig1, &sa, NULL) != 0
134 || sigaction (sig1 + 1, &sa, NULL) != 0
135 || sigaction (sig1 + 2, &sa, NULL) != 0)
136 {
137 puts ("sigaction failed");
138 return 1;
139 }
140
141 if (pthread_barrier_init (&bar, NULL, 1 + N) != 0)
142 {
143 puts ("barrier_init failed");
144 return 1;
145 }
146
147 pthread_t th[N];
148 size_t i;
149 for (i = 0; i < N; ++i)
150 if (pthread_create (&th[i], NULL, tf, (void *) (long int) i) != 0)
151 {
152 puts ("create failed");
153 return 1;
154 }
155
156 /* Block the three signals. */
157 sigset_t ss;
158 sigemptyset (&ss);
159 for (i = 0; i <= N; ++i)
160 sigaddset (&ss, sig1 + i);
161 if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)
162 {
163 puts ("main: sigmask failed");
164 return 1;
165 }
166
167 pthread_barrier_wait (&bar);
168
169 /* Send some signals. */
170 pid_t me = getpid ();
171 kill (me, sig1 + N);
172 for (i = 0; i < N; ++i)
173 kill (me, sig1 + i);
174 kill (me, sig1 + N);
175
176 /* Give the signals a chance to be worked on. */
177 sleep (1);
178
179 pthread_barrier_wait (&bar);
180
181 for (i = 0; i < N; ++i)
182 if (pthread_join (th[i], NULL) != 0)
183 {
184 puts ("join failed");
185 return 1;
186 }
187
188 return 0;
189 }
190
191 # define TEST_FUNCTION do_test ()
192
193 #else
194 # define TEST_FUNCTION 0
195 #endif
196 #include "../test-skeleton.c"