1/* Check 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
25static ucontext_t ctx[5];
26static atomic_int done;
27
28static void
29f1 (void)
30{
31 puts (s: "start f1");
32 if (!done)
33 {
34 if (getcontext (ucp: &ctx[2]) != 0)
35 {
36 printf (format: "%s: getcontext: %m\n", __FUNCTION__);
37 exit (EXIT_FAILURE);
38 }
39 if (done)
40 {
41 puts (s: "set context in f1");
42 if (setcontext (&ctx[3]) != 0)
43 {
44 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
45 exit (EXIT_FAILURE);
46 }
47 }
48 }
49 done++;
50 puts (s: "swap contexts in f1");
51 if (swapcontext (oucp: &ctx[4], ucp: &ctx[2]) != 0)
52 {
53 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
54 exit (EXIT_FAILURE);
55 }
56 puts (s: "end f1");
57 exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE);
58}
59
60static int
61do_test (void)
62{
63 char st1[32768];
64 puts (s: "making contexts");
65 if (getcontext (ucp: &ctx[0]) != 0)
66 {
67 printf (format: "%s: getcontext: %m\n", __FUNCTION__);
68 exit (EXIT_FAILURE);
69 }
70 if (getcontext (ucp: &ctx[1]) != 0)
71 {
72 printf (format: "%s: getcontext: %m\n", __FUNCTION__);
73 exit (EXIT_FAILURE);
74 }
75 ctx[1].uc_stack.ss_sp = st1;
76 ctx[1].uc_stack.ss_size = sizeof st1;
77 ctx[1].uc_link = &ctx[0];
78 makecontext (ucp: &ctx[1], func: (void (*) (void)) f1, argc: 0);
79 puts (s: "swap contexts");
80 if (swapcontext (oucp: &ctx[3], ucp: &ctx[1]) != 0)
81 {
82 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
83 exit (EXIT_FAILURE);
84 }
85 if (done != 1)
86 exit (EXIT_FAILURE);
87 done++;
88 puts (s: "set context");
89 if (setcontext (&ctx[4]) != 0)
90 {
91 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
92 exit (EXIT_FAILURE);
93 }
94 exit (EXIT_FAILURE);
95}
96
97#include <support/test-driver.c>
98

source code of glibc/stdlib/tst-setcontext7.c