1 /*
2 * Check handling of CLONE_PARENT'ed processes.
3 *
4 * Copyright (c) 2017 The strace developers.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31
32 #include <errno.h>
33 #include <sched.h>
34 #include <signal.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <sys/wait.h>
38 #include <unistd.h>
39
40 static int
child(void * const arg)41 child(void *const arg)
42 {
43 return 42;
44 }
45
46 #define child_stack_size (get_page_size() / 2)
47
48 #ifdef IA64
49 extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
50 # define clone(fn, child_stack, flags, arg) \
51 __clone2(fn, child_stack, child_stack_size, flags, arg)
52 #endif
53
54 int
main(void)55 main(void)
56 {
57 const pid_t pid = clone(child, tail_alloc(child_stack_size),
58 CLONE_PARENT | SIGCHLD, 0);
59 if (pid < 0)
60 perror_msg_and_fail("clone");
61
62 int status;
63 if (wait(&status) >= 0)
64 error_msg_and_fail("unexpected return code from wait");
65
66 while (!kill(pid, 0))
67 ;
68 if (errno != ESRCH)
69 perror_msg_and_fail("kill");
70
71 FILE *const fp = fdopen(3, "a");
72 if (!fp)
73 perror_msg_and_fail("fdopen");
74 if (fprintf(fp, "%s: Exit of unknown pid %d ignored\n",
75 getenv("STRACE_EXE") ?: "strace", pid) < 0)
76 perror_msg_and_fail("fprintf");
77
78 puts("+++ exited with 0 +++");
79 return 0;
80 }
81