1  /* Support for GNU properties.  Generic version.
       2     Copyright (C) 2018-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _DL_PROP_H
      20  #define _DL_PROP_H
      21  
      22  /* The following functions are used by the dynamic loader and the
      23     dlopen machinery to process PT_NOTE and PT_GNU_PROPERTY entries in
      24     the binary or shared object.  The notes can be used to change the
      25     behaviour of the loader, and as such offer a flexible mechanism
      26     for hooking in various checks related to ABI tags or implementing
      27     "flag day" ABI transitions.  */
      28  
      29  static inline void __attribute__ ((always_inline))
      30  _rtld_main_check (struct link_map *m, const char *program)
      31  {
      32  }
      33  
      34  static inline void __attribute__ ((always_inline))
      35  _dl_open_check (struct link_map *m)
      36  {
      37  }
      38  
      39  static inline void __attribute__ ((always_inline))
      40  _dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph)
      41  {
      42  }
      43  
      44  /* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of L,
      45     processing of the properties continues until this returns 0.  */
      46  static inline int __attribute__ ((always_inline))
      47  _dl_process_gnu_property (struct link_map *l, int fd, uint32_t type,
      48  			  uint32_t datasz, void *data)
      49  {
      50    /* Continue until GNU_PROPERTY_1_NEEDED is found.  */
      51    if (type == GNU_PROPERTY_1_NEEDED)
      52      {
      53        if (datasz == 4)
      54  	l->l_1_needed = *(unsigned int *) data;
      55        return 0;
      56      }
      57    return 1;
      58  }
      59  
      60  #endif /* _DL_PROP_H */