rt/tst-mqueue3.c

   1 /* Test SIGEV_THREAD handling for POSIX message queues.
   2    Copyright (C) 2004-2024 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"