debug/tst-read-chk-cancel.c

   1 /* Test that __read_chk is a cancellation point (BZ #29274)
   2    Copyright (C) 2022 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 <stdint.h>
  20 #include <support/xunistd.h>
  21 #include <support/xthread.h>
  22
  23 static int pipe_fds[2];
  24 static pthread_barrier_t barrier;
  25
  26 static void *
  27 read_thread (void *n)
  28 {
  29   xpthread_barrier_wait (&barrier);
  30   char c;
  31   /* This call should be forwarded to __read_chk because the buffer size
  32      is known, but the read length is non-constant.  */
  33   if (read (pipe_fds[0], &c, (uintptr_t) n) != 1)
  34     return (void *) -1L;
  35   return 0;
  36 }
  37
  38 static int
  39 do_test (void)
  40 {
  41   xpthread_barrier_init (&barrier, 0, 2);
  42   xpipe (pipe_fds);
  43   pthread_t thr = xpthread_create (0, read_thread, (void *) 1L);
  44   xpthread_barrier_wait (&barrier);
  45   xpthread_cancel (thr);
  46   xpthread_join (thr);
  47   return 0;
  48 }
  49
  50 #include <support/test-driver.c>