sysdeps/pthread/tst-signal1.c

   1 /* Copyright (C) 2002-2022 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 <errno.h>
  19 #include <pthread.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/mman.h>
  26 #include <sys/wait.h>
  27
  28
  29 static sigset_t ss;
  30 static pthread_barrier_t *b;
  31
  32
  33 static void *
  34 tf (void *arg)
  35 {
  36   sigdelset (&ss, SIGINT);
  37
  38   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  39     {
  40       puts ("2nd pthread_sigmask failed");
  41       exit (1);
  42     }
  43
  44   pthread_barrier_wait (b);
  45
  46   int sig;
  47   int res = sigwait (&ss, &sig);
  48   if (res == 0)
  49     {
  50       printf ("sigwait returned successfully with signal %d\n", sig);
  51       exit (1);
  52     }
  53
  54   printf ("sigwait returned with %s (%d)\n", strerror (res), res);
  55
  56   return NULL;
  57 }
  58
  59
  60 static void
  61 receiver (void)
  62 {
  63   pthread_t th;
  64
  65   /* Make sure the process doesn't run forever.  */
  66   alarm (10);
  67
  68   sigfillset (&ss);
  69
  70   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  71     {
  72       puts ("1st pthread_sigmask failed");
  73       exit (1);
  74     }
  75
  76   if (pthread_create (&th, NULL, tf, NULL) != 0)
  77     {
  78       puts ("pthread_create failed");
  79       exit (1);
  80     }
  81
  82   if (pthread_join (th, NULL) == 0)
  83     {
  84       puts ("thread joined?!");
  85       exit (1);
  86     }
  87
  88   _exit (0);
  89 }
  90
  91
  92 static int
  93 do_test (void)
  94 {
  95   char tmp[] = "/tmp/tst-signal1-XXXXXX";
  96
  97   int fd = mkstemp (tmp);
  98   if (fd == -1)
  99     {
 100       puts ("mkstemp failed");
 101       exit (1);
 102     }
 103
 104   unlink (tmp);
 105
 106   int i;
 107   for (i = 0; i < 20; ++i)
 108     write (fd, "foobar xyzzy", 12);
 109
 110   b = mmap (NULL, sizeof (pthread_barrier_t), PROT_READ | PROT_WRITE,
 111             MAP_SHARED, fd, 0);
 112   if (b == MAP_FAILED)
 113     {
 114       puts ("mmap failed");
 115       exit (1);
 116     }
 117
 118   pthread_barrierattr_t ba;
 119   if (pthread_barrierattr_init (&ba) != 0)
 120     {
 121       puts ("barrierattr_init failed");
 122       exit (1);
 123     }
 124
 125   if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
 126     {
 127       puts ("barrierattr_setpshared failed");
 128       exit (1);
 129     }
 130
 131   if (pthread_barrier_init (b, &ba, 2) != 0)
 132     {
 133       puts ("barrier_init failed");
 134       exit (1);
 135     }
 136
 137   if (pthread_barrierattr_destroy (&ba) != 0)
 138     {
 139       puts ("barrierattr_destroy failed");
 140       exit (1);
 141     }
 142
 143   pid_t pid = fork ();
 144   if (pid == -1)
 145     {
 146       puts ("fork failed");
 147       exit (1);
 148     }
 149
 150   if (pid == 0)
 151     receiver ();
 152
 153   pthread_barrier_wait (b);
 154
 155   /* Wait a bit more.  */
 156   struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000 };
 157   nanosleep (&ts, NULL);
 158
 159   /* Send the signal.  */
 160   puts ("sending the signal now");
 161   kill (pid, SIGINT);
 162
 163   /* Wait for the process to terminate.  */
 164   int status;
 165   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 166     {
 167       puts ("wrong child reported terminated");
 168       exit (1);
 169     }
 170
 171   if (!WIFSIGNALED (status))
 172     {
 173       puts ("child wasn't signalled");
 174       exit (1);
 175     }
 176
 177   if (WTERMSIG (status) != SIGINT)
 178     {
 179       puts ("child not terminated with SIGINT");
 180       exit (1);
 181     }
 182
 183   return 0;
 184 }
 185
 186 #define TEST_FUNCTION do_test ()
 187 #include "../test-skeleton.c"