sysdeps/pthread/tst-signal1.c

   1 /* Copyright (C) 2002-2024 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 #include <support/xunistd.h>
  29 #include <support/xsignal.h>
  30
  31 static sigset_t ss;
  32 static pthread_barrier_t *b;
  33
  34
  35 static void *
  36 tf (void *arg)
  37 {
  38   sigdelset (&ss, SIGINT);
  39
  40   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  41     {
  42       puts ("2nd pthread_sigmask failed");
  43       exit (1);
  44     }
  45
  46   pthread_barrier_wait (b);
  47
  48   int sig;
  49   int res = sigwait (&ss, &sig);
  50   if (res == 0)
  51     {
  52       printf ("sigwait returned successfully with signal %d\n", sig);
  53       exit (1);
  54     }
  55
  56   printf ("sigwait returned with %s (%d)\n", strerror (res), res);
  57
  58   return NULL;
  59 }
  60
  61
  62 static void
  63 receiver (void)
  64 {
  65   pthread_t th;
  66
  67   /* Make sure the process doesn't run forever.  */
  68   alarm (10);
  69
  70   sigfillset (&ss);
  71
  72   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  73     {
  74       puts ("1st pthread_sigmask failed");
  75       exit (1);
  76     }
  77
  78   if (pthread_create (&th, NULL, tf, NULL) != 0)
  79     {
  80       puts ("pthread_create failed");
  81       exit (1);
  82     }
  83
  84   if (pthread_join (th, NULL) == 0)
  85     {
  86       puts ("thread joined?!");
  87       exit (1);
  88     }
  89
  90   _exit (0);
  91 }
  92
  93
  94 static int
  95 do_test (void)
  96 {
  97   xsignal (SIGINT, SIG_DFL);
  98
  99   char tmp[] = "/tmp/tst-signal1-XXXXXX";
 100
 101   int fd = mkstemp (tmp);
 102   if (fd == -1)
 103     {
 104       puts ("mkstemp failed");
 105       exit (1);
 106     }
 107
 108   unlink (tmp);
 109
 110   int i;
 111   for (i = 0; i < 20; ++i)
 112     xwrite (fd, "foobar xyzzy", 12);
 113
 114   b = mmap (NULL, sizeof (pthread_barrier_t), PROT_READ | PROT_WRITE,
 115             MAP_SHARED, fd, 0);
 116   if (b == MAP_FAILED)
 117     {
 118       puts ("mmap failed");
 119       exit (1);
 120     }
 121
 122   pthread_barrierattr_t ba;
 123   if (pthread_barrierattr_init (&ba) != 0)
 124     {
 125       puts ("barrierattr_init failed");
 126       exit (1);
 127     }
 128
 129   if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
 130     {
 131       puts ("barrierattr_setpshared failed");
 132       exit (1);
 133     }
 134
 135   if (pthread_barrier_init (b, &ba, 2) != 0)
 136     {
 137       puts ("barrier_init failed");
 138       exit (1);
 139     }
 140
 141   if (pthread_barrierattr_destroy (&ba) != 0)
 142     {
 143       puts ("barrierattr_destroy failed");
 144       exit (1);
 145     }
 146
 147   pid_t pid = fork ();
 148   if (pid == -1)
 149     {
 150       puts ("fork failed");
 151       exit (1);
 152     }
 153
 154   if (pid == 0)
 155     receiver ();
 156
 157   pthread_barrier_wait (b);
 158
 159   /* Wait a bit more.  */
 160   struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000 };
 161   nanosleep (&ts, NULL);
 162
 163   /* Send the signal.  */
 164   puts ("sending the signal now");
 165   kill (pid, SIGINT);
 166
 167   /* Wait for the process to terminate.  */
 168   int status;
 169   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 170     {
 171       puts ("wrong child reported terminated");
 172       exit (1);
 173     }
 174
 175   if (!WIFSIGNALED (status))
 176     {
 177       puts ("child wasn't signalled");
 178       exit (1);
 179     }
 180
 181   if (WTERMSIG (status) != SIGINT)
 182     {
 183       puts ("child not terminated with SIGINT");
 184       exit (1);
 185     }
 186
 187   return 0;
 188 }
 189
 190 #define TEST_FUNCTION do_test ()
 191 #include "../test-skeleton.c"