1/* Verify that the parent pid is unchanged by __clone_internal.
2 Copyright (C) 2021-2024 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 <sched.h>
20#include <signal.h>
21#include <string.h>
22#include <stdio.h>
23#include <unistd.h>
24#include <sys/types.h>
25#include <sys/wait.h>
26#include <clone_internal.h>
27#include <support/xunistd.h>
28
29#ifndef TEST_CLONE_FLAGS
30#define TEST_CLONE_FLAGS 0
31#endif
32
33static int sig;
34
35static int
36f (void *a)
37{
38 puts (s: "in f");
39 union sigval sival;
40 sival.sival_int = getpid ();
41 printf (format: "pid = %d\n", sival.sival_int);
42 if (sigqueue (pid: getppid (), sig: sig, val: sival) != 0)
43 return 1;
44 return 0;
45}
46
47
48static int
49do_test (void)
50{
51 int mypid = getpid ();
52
53 sig = SIGRTMIN;
54 sigset_t ss;
55 sigemptyset (&ss);
56 sigaddset (&ss, sig);
57 if (sigprocmask (SIG_BLOCK, set: &ss, NULL) != 0)
58 {
59 printf (format: "sigprocmask failed: %m\n");
60 return 1;
61 }
62
63#define STACK_SIZE 128 * 1024
64 char st[STACK_SIZE] __attribute__ ((aligned));
65 struct clone_args clone_args =
66 {
67 .flags = TEST_CLONE_FLAGS & ~CSIGNAL,
68 .exit_signal = TEST_CLONE_FLAGS & CSIGNAL,
69 .stack = (uintptr_t) st,
70 .stack_size = sizeof (st),
71 };
72 pid_t p = __clone_internal (&clone_args, f, 0);
73 if (p == -1)
74 {
75 printf(format: "clone failed: %m\n");
76 return 1;
77 }
78 printf (format: "new thread: %d\n", (int) p);
79
80 siginfo_t si;
81 do
82 if (sigwaitinfo (set: &ss, info: &si) < 0)
83 {
84 printf(format: "sigwaitinfo failed: %m\n");
85 kill (pid: p, SIGKILL);
86 return 1;
87 }
88 while (si.si_signo != sig || si.si_code != SI_QUEUE);
89
90 int e;
91 xwaitpid (p, status: &e, __WCLONE);
92 if (!WIFEXITED (e))
93 {
94 if (WIFSIGNALED (e))
95 printf (format: "died from signal %s\n", strsignal (WTERMSIG (e)));
96 else
97 puts (s: "did not terminate correctly");
98 return 1;
99 }
100 if (WEXITSTATUS (e) != 0)
101 {
102 printf (format: "exit code %d\n", WEXITSTATUS (e));
103 return 1;
104 }
105
106 if (si.si_int != (int) p)
107 {
108 printf (format: "expected PID %d, got si_int %d\n", (int) p, si.si_int);
109 kill (pid: p, SIGKILL);
110 return 1;
111 }
112
113 if (si.si_pid != p)
114 {
115 printf (format: "expected PID %d, got si_pid %d\n", (int) p, (int) si.si_pid);
116 kill (pid: p, SIGKILL);
117 return 1;
118 }
119
120 if (getpid () != mypid)
121 {
122 puts (s: "my PID changed");
123 return 1;
124 }
125
126 return 0;
127}
128
129#include <support/test-driver.c>
130

source code of glibc/sysdeps/unix/sysv/linux/tst-getpid1-internal.c