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
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))
f1(void)31 f1 (void)
32 {
33 printf ("start f1\n");
34 f2 ();
35 }
36
37 static void
38 __attribute__ ((noinline, noclone))
f2(void)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
f3(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
do_test(void)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>
89