stdlib/tst-setcontext5.c

   1 /* Check multiple setcontext calls.
   2    Copyright (C) 2018-2023 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 <stdio.h>
  20 #include <stdlib.h>
  21 #include <ucontext.h>
  22 #include <unistd.h>
  23
  24 static ucontext_t ctx[2];
  25 static volatile int done;
  26
  27 static void f2 (void);
  28
  29 static void
  30 __attribute__ ((noinline, noclone))
  31 f1 (void)
  32 {
  33   printf ("start f1\n");
  34   f2 ();
  35 }
  36
  37 static void
  38 __attribute__ ((noinline, noclone))
  39 f2 (void)
  40 {
  41   printf ("start f2\n");
  42   if (setcontext (&ctx[1]) != 0)
  43     {
  44       printf ("%s: setcontext: %m\n", __FUNCTION__);
  45       exit (EXIT_FAILURE);
  46     }
  47 }
  48
  49 static void
  50 f3 (void)
  51 {
  52   printf ("start f3\n");
  53   if (done)
  54     exit (EXIT_SUCCESS);
  55   done = 1;
  56   if (setcontext (&ctx[0]) != 0)
  57     {
  58       printf ("%s: setcontext: %m\n", __FUNCTION__);
  59       exit (EXIT_FAILURE);
  60     }
  61 }
  62
  63 static int
  64 do_test (void)
  65 {
  66   char st1[32768];
  67
  68   puts ("making contexts");
  69   if (getcontext (&ctx[0]) != 0)
  70     {
  71       printf ("%s: getcontext: %m\n", __FUNCTION__);
  72       exit (EXIT_FAILURE);
  73     }
  74   if (getcontext (&ctx[1]) != 0)
  75     {
  76       printf ("%s: getcontext: %m\n", __FUNCTION__);
  77       exit (EXIT_FAILURE);
  78     }
  79   ctx[1].uc_stack.ss_sp = st1;
  80   ctx[1].uc_stack.ss_size = sizeof st1;
  81   ctx[1].uc_link = &ctx[0];
  82   makecontext (&ctx[1], (void (*) (void)) f3, 0);
  83   f1 ();
  84   puts ("FAIL: returned from f1 ()");
  85   exit (EXIT_FAILURE);
  86 }
  87
  88 #include <support/test-driver.c>