1 /* Test SIGEV_THREAD handling for POSIX message queues.
2 Copyright (C) 2004-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <mqueue.h>
21 #include <signal.h>
22 #include <stddef.h>
23 #include <stdint.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/mman.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include <support/check.h>
31
32 #if _POSIX_THREADS
33 # include <pthread.h>
34
35 static pid_t pid;
36 static mqd_t m;
37 static const char message[] = "hello";
38
39 # define MAXMSG 10
40 # define MSGSIZE 10
41 # define UNIQUE 42
42
43
44 static void
45 fct (union sigval s)
46 {
47 /* Put the mq in non-blocking mode. */
48 struct mq_attr attr;
49 if (mq_getattr (m, &attr) != 0)
50 {
51 printf ("%s: mq_getattr failed: %m\n", __FUNCTION__);
52 exit (1);
53 }
54 attr.mq_flags |= O_NONBLOCK;
55 if (mq_setattr (m, &attr, NULL) != 0)
56 {
57 printf ("%s: mq_setattr failed: %m\n", __FUNCTION__);
58 exit (1);
59 }
60
61 /* Check the values. */
62 if (attr.mq_maxmsg != MAXMSG)
63 {
64 printf ("%s: mq_maxmsg wrong: is %jd, expected %d\n",
65 __FUNCTION__, (intmax_t) attr.mq_maxmsg, MAXMSG);
66 exit (1);
67 }
68 if (attr.mq_msgsize != MAXMSG)
69 {
70 printf ("%s: mq_msgsize wrong: is %jd, expected %d\n",
71 __FUNCTION__, (intmax_t) attr.mq_msgsize, MSGSIZE);
72 exit (1);
73 }
74
75 /* Read the message. */
76 char buf[attr.mq_msgsize];
77 ssize_t n = TEMP_FAILURE_RETRY (mq_receive (m, buf, attr.mq_msgsize, NULL));
78 if (n != sizeof (message))
79 {
80 printf ("%s: length of message wrong: is %zd, expected %zu\n",
81 __FUNCTION__, n, sizeof (message));
82 exit (1);
83 }
84 if (memcmp (buf, message, sizeof (message)) != 0)
85 {
86 printf ("%s: message wrong: is \"%s\", expected \"%s\"\n",
87 __FUNCTION__, buf, message);
88 exit (1);
89 }
90
91 exit (UNIQUE);
92 }
93
94
95 int
96 do_test (void)
97 {
98 char tmpfname[] = "/tmp/tst-mqueue3-barrier.XXXXXX";
99 int fd = mkstemp (tmpfname);
100 if (fd == -1)
101 {
102 printf ("cannot open temporary file: %m\n");
103 return 1;
104 }
105
106 /* Make sure it is always removed. */
107 unlink (tmpfname);
108
109 /* Create one page of data. */
110 size_t ps = sysconf (_SC_PAGESIZE);
111 char data[ps];
112 memset (data, '\0', ps);
113
114 /* Write the data to the file. */
115 if (write (fd, data, ps) != (ssize_t) ps)
116 {
117 puts ("short write");
118 return 1;
119 }
120
121 void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
122 if (mem == MAP_FAILED)
123 {
124 printf ("mmap failed: %m\n");
125 return 1;
126 }
127
128 pthread_barrier_t *b;
129 b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
130 & ~(__alignof (pthread_barrier_t) - 1));
131
132 pthread_barrierattr_t a;
133 if (pthread_barrierattr_init (&a) != 0)
134 {
135 puts ("barrierattr_init failed");
136 return 1;
137 }
138
139 if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
140 {
141 puts ("barrierattr_setpshared failed, could not test");
142 return 0;
143 }
144
145 if (pthread_barrier_init (b, &a, 2) != 0)
146 {
147 puts ("barrier_init failed");
148 return 1;
149 }
150
151 if (pthread_barrierattr_destroy (&a) != 0)
152 {
153 puts ("barrierattr_destroy failed");
154 return 1;
155 }
156
157 /* Name for the message queue. */
158 char mqname[sizeof ("/tst-mqueue3-") + 3 * sizeof (pid_t)];
159 snprintf (mqname, sizeof (mqname) - 1, "/tst-mqueue3-%ld",
160 (long int) getpid ());
161
162 /* Create the message queue. */
163 struct mq_attr attr = { .mq_maxmsg = MAXMSG, .mq_msgsize = MSGSIZE };
164 m = mq_open (mqname, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
165
166 if (m == -1)
167 {
168 if (errno == ENOSYS)
169 FAIL_UNSUPPORTED ("mq_open not supported");
170
171 printf ("mq_open failed with: %m\n");
172 return 1;
173 }
174
175 /* Unlink the message queue right away. */
176 if (mq_unlink (mqname) != 0)
177 {
178 puts ("mq_unlink failed");
179 return 1;
180 }
181
182 pid = fork ();
183 if (pid == -1)
184 {
185 puts ("fork failed");
186 return 1;
187 }
188 if (pid == 0)
189 {
190 /* Request notification via thread. */
191 struct sigevent ev;
192 ev.sigev_notify = SIGEV_THREAD;
193 ev.sigev_notify_function = fct;
194 ev.sigev_value.sival_ptr = NULL;
195 ev.sigev_notify_attributes = NULL;
196
197 /* Tell the kernel. */
198 if (mq_notify (m,&ev) != 0)
199 {
200 puts ("mq_notify failed");
201 exit (1);
202 }
203
204 /* Tell the parent we are ready. */
205 (void) pthread_barrier_wait (b);
206
207 /* Make sure the process goes away eventually. */
208 alarm (10);
209
210 /* Do nothing forever. */
211 while (1)
212 pause ();
213 }
214
215 /* Wait for the child process to register to notification method. */
216 (void) pthread_barrier_wait (b);
217
218 /* Send the message. */
219 if (mq_send (m, message, sizeof (message), 1) != 0)
220 {
221 kill (pid, SIGKILL);
222 puts ("mq_send failed");
223 return 1;
224 }
225
226 int r;
227 if (TEMP_FAILURE_RETRY (waitpid (pid, &r, 0)) != pid)
228 {
229 kill (pid, SIGKILL);
230 puts ("waitpid failed");
231 return 1;
232 }
233
234 return WIFEXITED (r) && WEXITSTATUS (r) == UNIQUE ? 0 : 1;
235 }
236 # define TEST_FUNCTION do_test ()
237 #else
238 # define TEST_FUNCTION 0
239 #endif
240
241 #include "../test-skeleton.c"