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