1  /*
       2   * Copyright (c) 2020-2021 Dmitry V. Levin <ldv@strace.io>
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #include "xgetdents.h"
       9  #include "kernel_dirent.h"
      10  
      11  #define D_NAME_LEN_MAX 256
      12  
      13  static void
      14  print_dentry_head(const kernel_dirent64_t *const dent)
      15  {
      16  	tprint_struct_begin();
      17  	PRINT_FIELD_U(*dent, d_ino);
      18  	tprint_struct_next();
      19  	PRINT_FIELD_U(*dent, d_off);
      20  	tprint_struct_next();
      21  	PRINT_FIELD_U(*dent, d_reclen);
      22  }
      23  
      24  static unsigned int
      25  decode_dentry_head(struct tcb *const tcp, const void *const arg)
      26  {
      27  	const kernel_dirent64_t *const dent = arg;
      28  
      29  	if (!abbrev(tcp))
      30  		print_dentry_head(dent);
      31  
      32  	return dent->d_reclen;
      33  }
      34  
      35  static int
      36  decode_dentry_tail(struct tcb *const tcp, kernel_ulong_t addr,
      37  		   const void *const arg, unsigned int d_name_len)
      38  {
      39  	const kernel_dirent64_t *const dent = arg;
      40  	int rc = 0;
      41  
      42  	/* !abbrev(tcp) */
      43  
      44  	tprint_struct_next();
      45  	PRINT_FIELD_XVAL(*dent, d_type, dirent_types, "DT_???");
      46  
      47  	if (d_name_len) {
      48  		if (d_name_len > D_NAME_LEN_MAX)
      49  			d_name_len = D_NAME_LEN_MAX;
      50  		tprint_struct_next();
      51  		tprints_field_name("d_name");
      52  		rc = printpathn(tcp, addr, d_name_len - 1);
      53  	}
      54  	tprint_struct_end();
      55  
      56  	return rc;
      57  }
      58  
      59  SYS_FUNC(getdents64)
      60  {
      61  	/* The minimum size of a valid directory entry.  */
      62  	static const unsigned int header_size =
      63  		offsetof(kernel_dirent64_t, d_name);
      64  
      65  	return xgetdents(tcp, header_size,
      66  			 decode_dentry_head, decode_dentry_tail);
      67  }