1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/* Check setcontext on the context from makecontext.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>
#include <unistd.h>
#include <stdatomic.h>
static ucontext_t ctx[5];
static atomic_int done;
static void
f1 (void)
{
puts ("start f1");
if (!done)
{
if (getcontext (&ctx[2]) != 0)
{
printf ("%s: getcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
if (done)
{
puts ("set context in f1");
if (setcontext (&ctx[3]) != 0)
{
printf ("%s: setcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
}
}
done++;
puts ("swap contexts in f1");
if (swapcontext (&ctx[4], &ctx[2]) != 0)
{
printf ("%s: setcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
puts ("end f1");
exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE);
}
static int
do_test (void)
{
char st1[32768];
puts ("making contexts");
if (getcontext (&ctx[0]) != 0)
{
printf ("%s: getcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
if (getcontext (&ctx[1]) != 0)
{
printf ("%s: getcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
ctx[1].uc_stack.ss_sp = st1;
ctx[1].uc_stack.ss_size = sizeof st1;
ctx[1].uc_link = &ctx[0];
makecontext (&ctx[1], (void (*) (void)) f1, 0);
puts ("swap contexts");
if (swapcontext (&ctx[3], &ctx[1]) != 0)
{
printf ("%s: setcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
if (done != 1)
exit (EXIT_FAILURE);
done++;
puts ("set context");
if (setcontext (&ctx[4]) != 0)
{
printf ("%s: setcontext: %m\n", __FUNCTION__);
exit (EXIT_FAILURE);
}
exit (EXIT_FAILURE);
}
#include <support/test-driver.c>
|
