1  /*
       2   * Copyright (c) 2008-2015 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2015-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #include "defs.h"
      10  #include "kernel_fcntl.h"
      11  #include "xlat/sfd_flags.h"
      12  
      13  static int
      14  do_signalfd(struct tcb *tcp, int flags_arg)
      15  {
      16  	/* fd */
      17  	printfd(tcp, tcp->u_arg[0]);
      18  	tprint_arg_next();
      19  
      20  	/* NB: kernel requires arg[2] == NSIG_BYTES */
      21  	/* mask */
      22  	print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[2]);
      23  	tprint_arg_next();
      24  
      25  	/* sizemask */
      26  	PRINT_VAL_U(tcp->u_arg[2]);
      27  	if (flags_arg >= 0) {
      28  		tprint_arg_next();
      29  
      30  		/* flags */
      31  		printflags(sfd_flags, tcp->u_arg[flags_arg], "SFD_???");
      32  	}
      33  
      34  	return RVAL_DECODED | RVAL_FD;
      35  }
      36  
      37  SYS_FUNC(signalfd)
      38  {
      39  	return do_signalfd(tcp, -1);
      40  }
      41  
      42  SYS_FUNC(signalfd4)
      43  {
      44  	return do_signalfd(tcp, 3);
      45  }