1  /*
       2   * Copyright (c) 1999-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #include "defs.h"
       9  
      10  static int
      11  dup_123(struct tcb *const tcp, const int newfd_arg, const int flags_arg)
      12  {
      13  	/* oldfd */
      14  	printfd(tcp, tcp->u_arg[0]);
      15  
      16  	if (newfd_arg > 0) {
      17  		tprint_arg_next();
      18  		/* newfd */
      19  		printfd(tcp, tcp->u_arg[newfd_arg]);
      20  
      21  		if (flags_arg > 0) {
      22  			tprint_arg_next();
      23  			/* flags */
      24  			printflags(open_mode_flags, tcp->u_arg[flags_arg],
      25  				   "O_???");
      26  		}
      27  	}
      28  
      29  	return RVAL_DECODED | RVAL_FD;
      30  }
      31  
      32  SYS_FUNC(dup)
      33  {
      34  	return dup_123(tcp, -1, -1);
      35  }
      36  
      37  SYS_FUNC(dup2)
      38  {
      39  	return dup_123(tcp, 1, -1);
      40  }
      41  
      42  SYS_FUNC(dup3)
      43  {
      44  	return dup_123(tcp, 1, 2);
      45  }