1  /*
       2   * Copyright (c) 2021-2022 The strace developers.
       3   * Copyright (c) 2021 André Almeida <andrealmeid@collabora.com>
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #include "defs.h"
      10  #include <linux/futex.h>
      11  #include "xlat/futex_waiter_flags.h"
      12  
      13  struct print_waiter_data {
      14  	unsigned int count;
      15  };
      16  
      17  static bool
      18  print_waiter(struct tcb * const tcp, void * const elem_buf,
      19  	     const size_t elem_size, void * const data)
      20  {
      21  	struct futex_waitv *waiter = elem_buf;
      22  	struct print_waiter_data *p = data;
      23  
      24  	if (p->count++ >= FUTEX_WAITV_MAX) {
      25  		tprint_more_data_follows();
      26  		return false;
      27  	}
      28  
      29  	tprint_struct_begin();
      30  	PRINT_FIELD_X(*waiter, val);
      31  
      32  	tprint_struct_next();
      33  	PRINT_FIELD_ADDR64(*waiter, uaddr);
      34  
      35  	tprint_struct_next();
      36  	PRINT_FIELD_FLAGS(*waiter, flags, futex_waiter_flags, "FUTEX_???");
      37  
      38  	if (waiter->__reserved) {
      39  		tprint_struct_next();
      40  		PRINT_FIELD_X(*waiter, __reserved);
      41  	}
      42  
      43  	tprint_struct_end();
      44  	return true;
      45  }
      46  
      47  static void
      48  print_waiter_array(struct tcb * const tcp, const kernel_ulong_t waiters,
      49  		   const unsigned int nr_futexes)
      50  {
      51  	struct futex_waitv buf;
      52  	struct print_waiter_data data = {};
      53  
      54  	print_array(tcp, waiters, nr_futexes, &buf, sizeof(buf),
      55  		    tfetch_mem, print_waiter, &data);
      56  }
      57  
      58  SYS_FUNC(futex_waitv)
      59  {
      60  	const kernel_ulong_t waiters = tcp->u_arg[0];
      61  	const unsigned int nr_futexes = tcp->u_arg[1];
      62  	const unsigned int flags = tcp->u_arg[2];
      63  	const kernel_ulong_t timeout = tcp->u_arg[3];
      64  	const unsigned int clockid = tcp->u_arg[4];
      65  
      66  	print_waiter_array(tcp, waiters, nr_futexes);
      67  	tprint_arg_next();
      68  	PRINT_VAL_U(nr_futexes);
      69  	tprint_arg_next();
      70  	PRINT_VAL_X(flags);
      71  	tprint_arg_next();
      72  	print_timespec64(tcp, timeout);
      73  	tprint_arg_next();
      74  	printxval(clocknames, clockid, "CLOCK_???");
      75  
      76  	return RVAL_DECODED;
      77  }