1 /* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
2 Copyright (C) 2021-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
30 #include <sys/types.h>
32 #include <sys/syscall.h>
33 #include <clone_internal.h>
34 #include <support/xunistd.h>
35 #include <support/check.h>
45 pid_t ppid
= getppid ();
46 pid_t pid
= getpid ();
47 pid_t tid
= gettid ();
49 if (write (pipefd
[1], &ppid
, sizeof ppid
) != sizeof (ppid
))
50 FAIL_EXIT1 ("write ppid failed\n");
51 if (write (pipefd
[1], &pid
, sizeof pid
) != sizeof (pid
))
52 FAIL_EXIT1 ("write pid failed\n");
53 if (write (pipefd
[1], &tid
, sizeof tid
) != sizeof (tid
))
54 FAIL_EXIT1 ("write tid failed\n");
67 if (sigprocmask (SIG_BLOCK
, &ss
, NULL
) != 0)
68 FAIL_EXIT1 ("sigprocmask failed: %m");
70 if (pipe2 (pipefd
, O_CLOEXEC
))
71 FAIL_EXIT1 ("pipe failed: %m");
74 # define STACK_SIZE 256 * 1024
76 # define STACK_SIZE 128 * 1024
78 char st
[STACK_SIZE
] __attribute__ ((aligned
));
79 struct clone_args clone_args
=
81 .stack
= (uintptr_t) st
,
82 .stack_size
= sizeof (st
),
84 pid_t p
= __clone_internal (&clone_args
, f
, 0);
89 FAIL_EXIT1("clone failed: %m");
92 if (read (pipefd
[0], &ppid
, sizeof pid
) != sizeof pid
)
95 FAIL_EXIT1 ("read ppid failed: %m");
97 if (read (pipefd
[0], &pid
, sizeof pid
) != sizeof pid
)
100 FAIL_EXIT1 ("read pid failed: %m");
102 if (read (pipefd
[0], &tid
, sizeof tid
) != sizeof tid
)
105 FAIL_EXIT1 ("read tid failed: %m");
110 pid_t own_pid
= getpid ();
111 pid_t own_tid
= syscall (__NR_gettid
);
113 /* Some sanity checks for clone syscall: returned ppid should be current
114 pid and both returned tid/pid should be different from current one. */
115 if ((ppid
!= own_pid
) || (pid
== own_pid
) || (tid
== own_tid
))
116 FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
117 (int)ppid
, (int)pid
, (int)tid
, (int)own_pid
, (int)own_tid
);
120 xwaitpid (p
, &e
, __WCLONE
);
121 TEST_VERIFY (WIFEXITED (e
));
122 TEST_COMPARE (WEXITSTATUS (e
), 0);
126 #include <support/test-driver.c>