1  /*
       2   * Check handling of CLONE_PARENT'ed processes.
       3   *
       4   * Copyright (c) 2017-2020 The strace developers.
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  
      12  #include <errno.h>
      13  #include <sched.h>
      14  #include <signal.h>
      15  #include <stdio.h>
      16  #include <stdlib.h>
      17  #include <sys/wait.h>
      18  #include <unistd.h>
      19  
      20  #ifndef QUIET_MSG
      21  # define QUIET_MSG 0
      22  #endif
      23  
      24  static int
      25  child(void *const arg)
      26  {
      27  	return 42;
      28  }
      29  
      30  #ifdef IA64
      31  extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
      32  # define do_clone(fn_, stack_, size_, flags_, arg_, ...)	\
      33  	__clone2((fn_), (stack_), (size_), (flags_), (arg_), ## __VA_ARGS__)
      34  #else
      35  # define do_clone(fn_, stack_, size_, flags_, arg_, ...)	\
      36  	clone((fn_), (stack_), (flags_), (arg_), ## __VA_ARGS__)
      37  #endif
      38  
      39  int
      40  main(void)
      41  {
      42  	const unsigned long child_stack_size = get_page_size();
      43  	void *const child_stack =
      44  		tail_alloc(child_stack_size * 2) + child_stack_size;
      45  
      46  	const pid_t pid = do_clone(child, child_stack, child_stack_size,
      47  				   CLONE_PARENT | SIGCHLD, 0);
      48  	if (pid < 0)
      49  		perror_msg_and_fail("clone");
      50  
      51  	int status;
      52  	if (wait(&status) >= 0)
      53  		error_msg_and_fail("unexpected return code from wait");
      54  
      55  	while (!kill(pid, 0))
      56  		;
      57  	if (errno != ESRCH)
      58  		perror_msg_and_fail("kill");
      59  
      60  	FILE *const fp = fdopen(3, "a");
      61  	if (!fp)
      62  		perror_msg_and_fail("fdopen");
      63  #if !QUIET_MSG
      64  	if (fprintf(fp, "%s: Exit of unknown pid %d ignored\n",
      65  		    getenv("STRACE_EXE") ?: "strace", pid) < 0)
      66  		perror_msg_and_fail("fprintf");
      67  #endif
      68  
      69  #if !QUIET_MSG
      70  	puts("+++ exited with 0 +++");
      71  #endif
      72  	return 0;
      73  }