1  /*
       2   * Copyright (c) 2020-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: GPL-2.0-or-later
       6   */
       7  
       8  #include "tests.h"
       9  #include "scno.h"
      10  #include "pidns.h"
      11  
      12  #if defined __NR_getpid && (!defined __NR_getxpid || __NR_getxpid != __NR_getpid)
      13  
      14  # include <stdio.h>
      15  # include <unistd.h>
      16  # include <sys/time.h>
      17  
      18  # define SYSCALL_COUNT 10000
      19  
      20  /**
      21   * Max ratio of the execution time with and without pidns translation.
      22   */
      23  # define MAX_TIME_RATIO 20
      24  
      25  static long
      26  execute_syscalls(void)
      27  {
      28  	/* Load our PID in the cache */
      29  	syscall(__NR_getpid);
      30  
      31  	struct timeval stop, start;
      32  	gettimeofday(&start, NULL);
      33  
      34  	for (int i = 0; i < SYSCALL_COUNT; i++)
      35  	       syscall(__NR_getpid);
      36  
      37  	gettimeofday(&stop, NULL);
      38  
      39  	return (stop.tv_usec - start.tv_usec) +
      40  		(stop.tv_sec - start.tv_sec) * 1000000;
      41  }
      42  
      43  int
      44  main(void)
      45  {
      46  	long orig_us = execute_syscalls();
      47  	long max_us = orig_us * MAX_TIME_RATIO;
      48  
      49  	pidns_test_init();
      50  
      51  	long us = execute_syscalls();
      52  
      53  	fprintf(stderr, "Before PID NS test init: %ld\n"
      54  			"After PID NS test init:  %ld (%.2f times slower)\n",
      55  		orig_us, us, (float) us / orig_us);
      56  
      57  	if (us > max_us)
      58  		error_msg_and_fail("pidns translation took too long: %ld us "
      59  		                   "(max: %ld us)", us, max_us);
      60  
      61  	return 0;
      62  }
      63  
      64  #else
      65  
      66  SKIP_MAIN_UNDEFINED("__NR_getpid")
      67  
      68  #endif