1  /*
       2   * Copyright (c) 2015-2021 Dmitry V. Levin <ldv@strace.io>
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: GPL-2.0-or-later
       6   */
       7  
       8  #include "tests.h"
       9  #include <assert.h>
      10  #include <stdio.h>
      11  #include <string.h>
      12  #include <unistd.h>
      13  #include <sys/wait.h>
      14  
      15  static int
      16  logit_(const char *const str)
      17  {
      18  	return !chdir(str);
      19  }
      20  
      21  #define prefix "fork-f."
      22  #define logit(arg) logit_(prefix arg)
      23  
      24  int main(int ac, char **av)
      25  {
      26  	if (ac < 1)
      27  		return 1;
      28  	if (ac > 1)
      29  		return logit("exec");
      30  
      31  	logit("start");
      32  
      33  	int child_wait_fds[2];
      34  	(void) close(0);
      35  	if (pipe(child_wait_fds))
      36  		perror_msg_and_fail("pipe");
      37  
      38  	pid_t pid = fork();
      39  
      40  	if (pid < 0)
      41  		perror_msg_and_fail("fork");
      42  
      43  	if (!pid) {
      44  		close(child_wait_fds[1]);
      45  
      46  		if (read(0, child_wait_fds, sizeof(int)))
      47  			_exit(2);
      48  
      49  		char *const args[] = { av[0], (char *) "", NULL };
      50  		if (logit("child") || execve(args[0], args, args + 1))
      51  			_exit(2);
      52  	}
      53  
      54  	close(0);
      55  
      56  	logit("parent");
      57  	close(child_wait_fds[1]);
      58  
      59  	int status;
      60  	assert(wait(&status) == pid);
      61  	assert(status == 0);
      62  
      63  	pid_t ppid = getpid();
      64  	logit("finish");
      65  
      66  	printf("%-5d chdir(\"%sstart\") = -1 ENOENT (%m)\n"
      67  	       "%-5d chdir(\"%sparent\") = -1 ENOENT (%m)\n"
      68  	       "%-5d chdir(\"%schild\") = -1 ENOENT (%m)\n"
      69  	       "%-5d chdir(\"%sexec\") = -1 ENOENT (%m)\n"
      70  	       "%-5d chdir(\"%sfinish\") = -1 ENOENT (%m)\n",
      71  	       ppid, prefix,
      72  	       ppid, prefix,
      73  	       pid, prefix,
      74  	       pid, prefix,
      75  	       ppid, prefix);
      76  	return 0;
      77  }