rt/tst-shm-cancel.c

   1 /* Test for shm_open cancellation handling: BZ #18243.
   2    Copyright (C) 2016-2023 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 <pthread.h>
  20 #include <sys/mman.h>
  21 #include <semaphore.h>
  22 #include <stdio.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <stdlib.h>
  27
  28 static sem_t sem;       /* Use to sync with thread start.  */
  29 static char shm_name[sizeof "/glibc-shm_open-cancel-" + sizeof (pid_t) * 3];
  30
  31 static void
  32 init_shm_name (void)
  33 {
  34   snprintf (shm_name, sizeof (shm_name), "/glibc-shm_open-cancel-%u",
  35             getpid ());
  36 }
  37
  38 static void
  39 remove_shm (int status, void *arg)
  40 {
  41   shm_unlink (shm_name);
  42 }
  43
  44 static void *
  45 tf (void *arg)
  46 {
  47   pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0);
  48
  49   if (sem_wait (&sem) != 0)
  50     {
  51       printf ("error: sem_wait failed: %m");
  52       exit (1);
  53     }
  54
  55   if (pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, 0) != 0)
  56     {
  57       printf ("error: pthread_setcancelstate failed: %m");
  58       exit (1);
  59     }
  60
  61   /* Neither sem_unlink or sem_open should act on thread cancellation.  */
  62   shm_unlink (shm_name);
  63   on_exit (remove_shm, NULL);
  64
  65   int fd = shm_open (shm_name, O_CREAT, 0600);
  66   if (fd == -1)
  67     {
  68       int exit_code;
  69       if (errno == ENOSYS || errno == EACCES)
  70         exit_code = 77;
  71       else
  72         exit_code = 1;
  73       exit (exit_code);
  74     }
  75
  76   if (pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0) != 0)
  77     {
  78       printf ("error: pthread_setcancelstate failed: %m");
  79       exit (1);
  80     }
  81
  82   if (close (fd) != 0)
  83     {
  84       printf ("error: pthread_setcancelstate failed: %m");
  85       exit (1);
  86     }
  87
  88   return NULL;
  89 }
  90
  91 static int
  92 do_test (void)
  93 {
  94   pthread_t td;
  95
  96   init_shm_name ();
  97
  98   if (sem_init (&sem, 0, 0))
  99     {
 100       printf ("error: sem_init failed: %m\n");
 101       exit (1);
 102     }
 103
 104   if (pthread_create (&td, NULL, tf, NULL) != 0)
 105     {
 106       printf ("error: pthread_create failed: %m\n");
 107       exit (1);
 108     }
 109
 110   if (pthread_cancel (td) != 0)
 111     {
 112       printf ("error: pthread_cancel failed: %m\n");
 113       exit (1);
 114     }
 115
 116   if (sem_post (&sem) != 0)
 117     {
 118       printf ("error: sem_post failed: %m\n");
 119       exit (1);
 120     }
 121
 122   void *r;
 123   if (pthread_join (td, &r) != 0)
 124     {
 125       printf ("error: pthread_join failed: %m\n");
 126       exit (1);
 127     }
 128
 129   if (r == PTHREAD_CANCELED)
 130     {
 131       puts ("error: pthread_join returned PTHREAD_CANCELED");
 132       exit (1);
 133     }
 134
 135   return 0;
 136 }
 137
 138 #define TEST_FUNCTION do_test ()
 139 #include <test-skeleton.c>