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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
Copyright (C) 2016-2025 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 <sched.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
#include <support/check.h>
static int sig;
static int pipefd[2];
static int
f (void *a)
{
close (pipefd[0]);
pid_t ppid = getppid ();
pid_t pid = getpid ();
pid_t tid = syscall (__NR_gettid);
if (write (pipefd[1], &ppid, sizeof ppid) != sizeof (ppid))
FAIL_EXIT1 ("write ppid failed\n");
if (write (pipefd[1], &pid, sizeof pid) != sizeof (pid))
FAIL_EXIT1 ("write pid failed\n");
if (write (pipefd[1], &tid, sizeof tid) != sizeof (tid))
FAIL_EXIT1 ("write tid failed\n");
return 0;
}
static int
do_test (void)
{
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
FAIL_EXIT1 ("sigprocmask failed: %m");
if (pipe2 (pipefd, O_CLOEXEC))
FAIL_EXIT1 ("pipe failed: %m");
int clone_flags = 0;
char st[128 * 1024] __attribute__ ((aligned));
#if _STACK_GROWS_DOWN
pid_t p = clone (f, st + sizeof (st), clone_flags, 0);
#elif _STACK_GROWS_UP
pid_t p = clone (f, st, clone_flags, 0);
#else
#error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
#endif
close (pipefd[1]);
if (p == -1)
FAIL_EXIT1("clone failed: %m");
pid_t ppid, pid, tid;
if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read ppid failed: %m");
}
if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read pid failed: %m");
}
if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read tid failed: %m");
}
close (pipefd[0]);
int ret = 0;
pid_t own_pid = getpid ();
pid_t own_tid = syscall (__NR_gettid);
/* Some sanity checks for clone syscall: returned ppid should be current
pid and both returned tid/pid should be different from current one. */
if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
(int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
int e;
if (waitpid (p, &e, __WCLONE) != p)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("waitpid failed");
}
if (!WIFEXITED (e))
{
if (WIFSIGNALED (e))
printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
else
puts ("did not terminate correctly");
exit (EXIT_FAILURE);
}
if (WEXITSTATUS (e) != 0)
FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
return ret;
}
#include <support/test-driver.c>
|
