1  /*
       2   * Check decoding of dup syscall.
       3   *
       4   * Copyright (c) 2016-2023 The strace developers.
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  #include "scno.h"
      12  
      13  #include <stdio.h>
      14  #include <unistd.h>
      15  
      16  #ifndef FD0_PATH
      17  # define FD0_PATH ""
      18  #endif
      19  #ifndef FD9_PATH
      20  # define FD9_PATH ""
      21  #endif
      22  #ifndef SKIP_IF_PROC_IS_UNAVAILABLE
      23  # define SKIP_IF_PROC_IS_UNAVAILABLE
      24  #endif
      25  
      26  #ifndef TRACE_FDS
      27  # define TRACE_FDS 0
      28  #endif
      29  #ifndef PATH_TRACING
      30  # define PATH_TRACING 0
      31  #endif
      32  #ifndef TRACE_FD_0
      33  # define TRACE_FD_0 (!TRACE_FDS && !PATH_TRACING)
      34  #endif
      35  #ifndef TRACE_OTHER_FDS
      36  # define TRACE_OTHER_FDS (!TRACE_FDS && !PATH_TRACING)
      37  #endif
      38  #ifndef TRACE_FD_9
      39  # define TRACE_FD_9 (!TRACE_FDS && !PATH_TRACING)
      40  #endif
      41  
      42  static const char *errstr;
      43  
      44  static long
      45  k_dup(const unsigned int fd)
      46  {
      47  	const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
      48  	const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
      49  	const kernel_ulong_t arg1 = fill | fd;
      50  	const long rc = syscall(__NR_dup, arg1, bad, bad, bad, bad, bad);
      51  	errstr = sprintrc(rc);
      52  	return rc;
      53  }
      54  
      55  int
      56  main(void)
      57  {
      58  	SKIP_IF_PROC_IS_UNAVAILABLE;
      59  
      60  	k_dup(-1);
      61  #if !PATH_TRACING && !TRACE_FDS
      62  	printf("dup(-1) = %s\n", errstr);
      63  #endif
      64  
      65  	int d1 = k_dup(0);
      66  #if TRACE_FD_0
      67  	printf("dup(0" FD0_PATH ") = %d" FD0_PATH "\n", d1);
      68  #endif
      69  
      70  	int d2 = k_dup(d1);
      71  #if TRACE_OTHER_FDS
      72  	printf("dup(%d" FD0_PATH ") = %d" FD0_PATH "\n", d1, d2);
      73  #endif
      74  
      75  	d2 = k_dup(9);
      76  #if PATH_TRACING || TRACE_FD_9
      77  	printf("dup(9" FD9_PATH ") = %d" FD9_PATH "\n", d2);
      78  #endif
      79  
      80  	d1 = k_dup(d2);
      81  #if PATH_TRACING || TRACE_OTHER_FDS
      82  	printf("dup(%d" FD9_PATH ") = %d" FD9_PATH "\n", d2, d1);
      83  #endif
      84  
      85  	puts("+++ exited with 0 +++");
      86  	return 0;
      87  }