1 /* Check getcontext and setcontext on the context from makecontext.
2    Copyright (C) 2018-2022 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 <stdio.h>
20 #include <stdlib.h>
21 #include <ucontext.h>
22 #include <unistd.h>
23 #include <stdatomic.h>
24 
25 static ucontext_t ctx[3];
26 static atomic_int done;
27 
28 static void
29 __attribute__((noinline, noclone))
f2(void)30 f2 (void)
31 {
32   printf ("start f2\n");
33   done++;
34   if (setcontext (&ctx[2]) != 0)
35     {
36       printf ("%s: setcontext: %m\n", __FUNCTION__);
37       exit (EXIT_FAILURE);
38     }
39 }
40 
41 static void
f1(void)42 f1 (void)
43 {
44   printf ("start f1\n");
45   if (getcontext (&ctx[2]) != 0)
46     {
47       printf ("%s: getcontext: %m\n", __FUNCTION__);
48       exit (EXIT_FAILURE);
49     }
50   if (done)
51     exit (EXIT_SUCCESS);
52   f2 ();
53 }
54 
55 static int
do_test(void)56 do_test (void)
57 {
58   char st1[32768];
59   puts ("making contexts");
60   if (getcontext (&ctx[0]) != 0)
61     {
62       printf ("%s: getcontext: %m\n", __FUNCTION__);
63       exit (EXIT_FAILURE);
64     }
65   if (getcontext (&ctx[1]) != 0)
66     {
67       printf ("%s: getcontext: %m\n", __FUNCTION__);
68       exit (EXIT_FAILURE);
69     }
70   ctx[1].uc_stack.ss_sp = st1;
71   ctx[1].uc_stack.ss_size = sizeof st1;
72   ctx[1].uc_link = &ctx[0];
73   makecontext (&ctx[1], (void (*) (void)) f1, 0);
74   if (setcontext (&ctx[1]) != 0)
75     {
76       printf ("%s: setcontext: %m\n", __FUNCTION__);
77       exit (EXIT_FAILURE);
78     }
79   exit (EXIT_FAILURE);
80 }
81 
82 #include <support/test-driver.c>
83