1/* Check multiple setcontext calls.
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
24static ucontext_t ctx[2];
25static volatile int done;
26
27static void f2 (void);
28
29static void
30__attribute__ ((noinline, noclone))
31f1 (void)
32{
33 printf (format: "start f1\n");
34 f2 ();
35}
36
37static void
38__attribute__ ((noinline, noclone))
39f2 (void)
40{
41 printf (format: "start f2\n");
42 if (setcontext (&ctx[1]) != 0)
43 {
44 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
45 exit (EXIT_FAILURE);
46 }
47}
48
49static void
50f3 (void)
51{
52 printf (format: "start f3\n");
53 if (done)
54 exit (EXIT_SUCCESS);
55 done = 1;
56 if (setcontext (&ctx[0]) != 0)
57 {
58 printf (format: "%s: setcontext: %m\n", __FUNCTION__);
59 exit (EXIT_FAILURE);
60 }
61}
62
63static int
64do_test (void)
65{
66 char st1[32768];
67
68 puts (s: "making contexts");
69 if (getcontext (ucp: &ctx[0]) != 0)
70 {
71 printf (format: "%s: getcontext: %m\n", __FUNCTION__);
72 exit (EXIT_FAILURE);
73 }
74 if (getcontext (ucp: &ctx[1]) != 0)
75 {
76 printf (format: "%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 (ucp: &ctx[1], func: (void (*) (void)) f3, argc: 0);
83 f1 ();
84 puts (s: "FAIL: returned from f1 ()");
85 exit (EXIT_FAILURE);
86}
87
88#include <support/test-driver.c>
89

source code of glibc/stdlib/tst-setcontext5.c