rt/tst-mqueue3.c

   1 /* Test SIGEV_THREAD handling for POSIX message queues.
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <mqueue.h>
  23 #include <signal.h>
  24 #include <stddef.h>
  25 #include <stdint.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/mman.h>
  30 #include <sys/wait.h>
  31 #include <unistd.h>
  32
  33 #if _POSIX_THREADS
  34 # include <pthread.h>
  35
  36 static pid_t pid;
  37 static mqd_t m;
  38 static const char message[] = "hello";
  39
  40 # define MAXMSG 10
  41 # define MSGSIZE 10
  42 # define UNIQUE 42
  43
  44
  45 static void
  46 fct (union sigval s)
  47 {
  48   /* Put the mq in non-blocking mode.  */
  49   struct mq_attr attr;
  50   if (mq_getattr (m, &attr) != 0)
  51     {
  52       printf ("%s: mq_getattr failed: %m\n", __FUNCTION__);
  53       exit (1);
  54     }
  55   attr.mq_flags |= O_NONBLOCK;
  56   if (mq_setattr (m, &attr, NULL) != 0)
  57     {
  58       printf ("%s: mq_setattr failed: %m\n", __FUNCTION__);
  59       exit (1);
  60     }
  61
  62   /* Check the values.  */
  63   if (attr.mq_maxmsg != MAXMSG)
  64     {
  65       printf ("%s: mq_maxmsg wrong: is %ld, expecte %d\n",
  66               __FUNCTION__, attr.mq_maxmsg, MAXMSG);
  67       exit (1);
  68     }
  69   if (attr.mq_msgsize != MAXMSG)
  70     {
  71       printf ("%s: mq_msgsize wrong: is %ld, expecte %d\n",
  72               __FUNCTION__, attr.mq_msgsize, MSGSIZE);
  73       exit (1);
  74     }
  75
  76   /* Read the message.  */
  77   char buf[attr.mq_msgsize];
  78   ssize_t n = TEMP_FAILURE_RETRY (mq_receive (m, buf, attr.mq_msgsize, NULL));
  79   if (n != sizeof (message))
  80     {
  81       printf ("%s: length of message wrong: is %zd, expected %zu\n",
  82               __FUNCTION__, n, sizeof (message));
  83       exit (1);
  84     }
  85   if (memcmp (buf, message, sizeof (message)) != 0)
  86     {
  87       printf ("%s: message wrong: is \"%s\", expected \"%s\"\n",
  88               __FUNCTION__, buf, message);
  89       exit (1);
  90     }
  91
  92   exit (UNIQUE);
  93 }
  94
  95
  96 int
  97 do_test (void)
  98 {
  99   char tmpfname[] = "/tmp/tst-mqueue3-barrier.XXXXXX";
 100   int fd = mkstemp (tmpfname);
 101   if (fd == -1)
 102     {
 103       printf ("cannot open temporary file: %m\n");
 104       return 1;
 105     }
 106
 107   /* Make sure it is always removed.  */
 108   unlink (tmpfname);
 109
 110   /* Create one page of data.  */
 111   size_t ps = sysconf (_SC_PAGESIZE);
 112   char data[ps];
 113   memset (data, '\0', ps);
 114
 115   /* Write the data to the file.  */
 116   if (write (fd, data, ps) != (ssize_t) ps)
 117     {
 118       puts ("short write");
 119       return 1;
 120     }
 121
 122   void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 123   if (mem == MAP_FAILED)
 124     {
 125       printf ("mmap failed: %m\n");
 126       return 1;
 127     }
 128
 129   pthread_barrier_t *b;
 130   b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
 131                              & ~(__alignof (pthread_barrier_t) - 1));
 132
 133   pthread_barrierattr_t a;
 134   if (pthread_barrierattr_init (&a) != 0)
 135     {
 136       puts ("barrierattr_init failed");
 137       return 1;
 138     }
 139
 140   if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
 141     {
 142       puts ("barrierattr_setpshared failed, could not test");
 143       return 0;
 144     }
 145
 146   if (pthread_barrier_init (b, &a, 2) != 0)
 147     {
 148       puts ("barrier_init failed");
 149       return 1;
 150     }
 151
 152   if (pthread_barrierattr_destroy (&a) != 0)
 153     {
 154       puts ("barrierattr_destroy failed");
 155       return 1;
 156     }
 157
 158   /* Name for the message queue.  */
 159   char mqname[sizeof ("/tst-mqueue3-") + 3 * sizeof (pid_t)];
 160   snprintf (mqname, sizeof (mqname) - 1, "/tst-mqueue3-%ld",
 161             (long int) getpid ());
 162
 163   /* Create the message queue.  */
 164   struct mq_attr attr = { .mq_maxmsg = MAXMSG, .mq_msgsize = MSGSIZE };
 165   m = mq_open (mqname, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
 166   if (m == -1)
 167     {
 168       if (errno == ENOSYS)
 169         {
 170           puts ("not implemented");
 171           return 0;
 172         }
 173
 174       puts ("mq_open failed");
 175       return 1;
 176     }
 177
 178   /* Unlink the message queue right away.  */
 179   if (mq_unlink (mqname) != 0)
 180     {
 181       puts ("mq_unlink failed");
 182       return 1;
 183     }
 184
 185   pid = fork ();
 186   if (pid == -1)
 187     {
 188       puts ("fork failed");
 189       return 1;
 190     }
 191   if (pid == 0)
 192     {
 193       /* Request notification via thread.  */
 194       struct sigevent ev;
 195       ev.sigev_notify = SIGEV_THREAD;
 196       ev.sigev_notify_function = fct;
 197       ev.sigev_value.sival_ptr = NULL;
 198       ev.sigev_notify_attributes = NULL;
 199
 200       /* Tell the kernel.  */
 201       if (mq_notify (m,&ev) != 0)
 202         {
 203           puts ("mq_notify failed");
 204           exit (1);
 205         }
 206
 207       /* Tell the parent we are ready.  */
 208       (void) pthread_barrier_wait (b);
 209
 210       /* Make sure the process goes away eventually.  */
 211       alarm (10);
 212
 213       /* Do nothing forever.  */
 214       while (1)
 215         pause ();
 216     }
 217
 218   /* Wait for the child process to register to notification method.  */
 219   (void) pthread_barrier_wait (b);
 220
 221   /* Send the message.  */
 222   if (mq_send (m, message, sizeof (message), 1) != 0)
 223     {
 224       kill (pid, SIGKILL);
 225       puts ("mq_send failed");
 226       return 1;
 227     }
 228
 229   int r;
 230   if (TEMP_FAILURE_RETRY (waitpid (pid, &r, 0)) != pid)
 231     {
 232       kill (pid, SIGKILL);
 233       puts ("waitpid failed");
 234       return 1;
 235     }
 236
 237   return WIFEXITED (r) && WEXITSTATUS (r) == UNIQUE ? 0 : 1;
 238 }
 239 # define TEST_FUNCTION do_test ()
 240 #else
 241 # define TEST_FUNCTION 0
 242 #endif
 243
 244 #include "../test-skeleton.c"