elf/dlfcn.h

   1 /* dlfcn.h -- User functions for run-time dynamic loading.
   2 Copyright (C) 1995 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _DLFCN_H
  21 #define _DLFCN_H 1
  22
  23
  24 /* Type of the second argument to `dlopen'.  */
  25 typedef enum
  26   {
  27     RTLD_LAZY =       1,        /* Lazy function call binding.  */
  28     RTLD_NOW =        2         /* Immediate function call binding.  */
  29   } dl_open_mode;
  30
  31 /* Open the shared object FILE and map it in; return a handle that can be
  32    passed to `dlsym' to get symbol values from it.  */
  33 extern void *dlopen (const char *__file, dl_open_mode);
  34
  35 /* Unmap and close a shared object opened by `dlopen'.
  36    The handle cannot be used again after calling `dlclose'.  */
  37 extern int dlclose (void *__handle);
  38
  39 /* Find the run-time address in the shared object HANDLE refers to
  40    of the symbol called NAME.  */
  41 extern void *dlsym (void *__handle, const char *__name);
  42
  43 /* When any of the above functions fails, call this function
  44    to return a string describing the error.  Each call resets
  45    the error string so that a following call returns null.  */
  46 extern char *dlerror (void);
  47
  48
  49 #endif  /* dlfcn.h */