aboutsummaryrefslogtreecommitdiff
path: root/rt/tst-mqueue3.c
blob: 021a373e5eeb27616bac17caee4c401ef9bc9314 (plain)
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
231
232
233
234
235
236
237
238
/* Test SIGEV_THREAD handling for POSIX message queues.
   Copyright (C) 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <mqueue.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>

#if _POSIX_THREADS
# include <pthread.h>

static pid_t pid;
static mqd_t m;
static const char message[] = "hello";

# define MAXMSG 10
# define MSGSIZE 10
# define UNIQUE 42


static void
fct (union sigval s)
{
  /* Put the mq in non-blocking mode.  */
  struct mq_attr attr;
  if (mq_getattr (m, &attr) != 0)
    {
      printf ("%s: mq_getattr failed: %m\n", __FUNCTION__);
      exit (1);
    }
  attr.mq_flags |= O_NONBLOCK;
  if (mq_setattr (m, &attr, NULL) != 0)
    {
      printf ("%s: mq_setattr failed: %m\n", __FUNCTION__);
      exit (1);
    }

  /* Check the values.  */
  if (attr.mq_maxmsg != MAXMSG)
    {
      printf ("%s: mq_maxmsg wrong: is %ld, expecte %d\n",
	      __FUNCTION__, attr.mq_maxmsg, MAXMSG);
      exit (1);
    }
  if (attr.mq_msgsize != MAXMSG)
    {
      printf ("%s: mq_msgsize wrong: is %ld, expecte %d\n",
	      __FUNCTION__, attr.mq_msgsize, MSGSIZE);
      exit (1);
    }

  /* Read the message.  */
  char buf[attr.mq_msgsize];
  ssize_t n = TEMP_FAILURE_RETRY (mq_receive (m, buf, attr.mq_msgsize, NULL));
  if (n != sizeof (message))
    {
      printf ("%s: length of message wrong: is %zd, expected %zu\n",
	      __FUNCTION__, n, sizeof (message));
      exit (1);
    }
  if (memcmp (buf, message, sizeof (message)) != 0)
    {
      printf ("%s: message wrong: is \"%s\", expected \"%s\"\n",
	      __FUNCTION__, buf, message);
      exit (1);
    }

  exit (UNIQUE);
}


int
do_test (void)
{
  char tmpfname[] = "/tmp/tst-mqueue3-barrier.XXXXXX";
  int fd = mkstemp (tmpfname);
  if (fd == -1)
    {
      printf ("cannot open temporary file: %m\n");
      return 1;
    }

  /* Make sure it is always removed.  */
  unlink (tmpfname);

  /* Create one page of data.  */
  size_t ps = sysconf (_SC_PAGESIZE);
  char data[ps];
  memset (data, '\0', ps);

  /* Write the data to the file.  */
  if (write (fd, data, ps) != (ssize_t) ps)
    {
      puts ("short write");
      return 1;
    }

  void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (mem == MAP_FAILED)
    {
      printf ("mmap failed: %m\n");
      return 1;
    }

  pthread_barrier_t *b;
  b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
                             & ~(__alignof (pthread_barrier_t) - 1));

  pthread_barrierattr_t a;
  if (pthread_barrierattr_init (&a) != 0)
    {
      puts ("barrierattr_init failed");
      return 1;
    }

  if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("barrierattr_setpshared failed, could not test");
      return 0;
    }

  if (pthread_barrier_init (b, &a, 2) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  if (pthread_barrierattr_destroy (&a) != 0)
    {
      puts ("barrierattr_destroy failed");
      return 1;
    }

  /* Name for the message queue.  */
  char mqname[sizeof ("/tst-mqueue3-") + 3 * sizeof (pid_t)];
  snprintf (mqname, sizeof (mqname) - 1, "/tst-mqueue3-%ld",
	    (long int) getpid ());

  /* Create the message queue.  */
  struct mq_attr attr = { .mq_maxmsg = MAXMSG, .mq_msgsize = MSGSIZE };
  m = mq_open (mqname, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
  if (m == -1)
    {
      puts ("mq_open failed");
      return 1;
    }

  /* Unlink the message queue right away.  */
  if (mq_unlink (mqname) != 0)
    {
      puts ("mq_unlink failed");
      return 1;
    }

  pid = fork ();
  if (pid == -1)
    {
      puts ("fork failed");
      return 1;
    }
  if (pid == 0)
    {
      /* Request notification via thread.  */
      struct sigevent ev;
      ev.sigev_notify = SIGEV_THREAD;
      ev.sigev_notify_function = fct;
      ev.sigev_value.sival_ptr = NULL;
      ev.sigev_notify_attributes = NULL;

      /* Tell the kernel.  */
      if (mq_notify (m,&ev) != 0)
	{
	  puts ("mq_notify failed");
	  exit (1);
	}

      /* Tell the parent we are ready.  */
      (void) pthread_barrier_wait (b);

      /* Make sure the process goes away eventually.  */
      alarm (10);

      /* Do nothing forever.  */
      while (1)
	pause ();
    }

  /* Wait for the child process to register to notification method.  */
  (void) pthread_barrier_wait (b);

  /* Send the message.  */
  if (mq_send (m, message, sizeof (message), 1) != 0)
    {
      kill (pid, SIGKILL);
      puts ("mq_send failed");
      return 1;
    }

  int r;
  if (TEMP_FAILURE_RETRY (waitpid (pid, &r, 0)) != pid)
    {
      kill (pid, SIGKILL);
      puts ("waitpid failed");
      return 1;
    }

  return WIFEXITED (r) && WEXITSTATUS (r) == UNIQUE ? 0 : 1;
}
# define TEST_FUNCTION do_test ()
#else
# define TEST_FUNCTION 0
#endif

#include "../test-skeleton.c"