dlfcn.h 2.5 KB

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  1. /* System dependent definitions for run-time dynamic loading.
  2. Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #ifndef _DLFCN_H
  17. # error "Never use <bits/dlfcn.h> directly; include <dlfcn.h> instead."
  18. #endif
  19. /* The MODE argument to `dlopen' contains one of the following: */
  20. #define RTLD_LAZY 0x00001 /* Lazy function call binding. */
  21. #define RTLD_NOW 0x00002 /* Immediate function call binding. */
  22. #define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
  23. #define RTLD_NOLOAD 0x00004 /* Do not load the object. */
  24. /* If the following bit is set in the MODE argument to `dlopen',
  25. the symbols of the loaded object and its dependencies are made
  26. visible as if the object were linked directly into the program. */
  27. #define RTLD_GLOBAL 0x00100
  28. /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
  29. The implementation does this by default and so we can define the
  30. value to zero. */
  31. #define RTLD_LOCAL 0
  32. /* Do not delete object when closed. */
  33. #define RTLD_NODELETE 0x01000
  34. #ifdef __USE_GNU
  35. /* To support profiling of shared objects it is a good idea to call
  36. the function found using `dlsym' using the following macro since
  37. these calls do not use the PLT. But this would mean the dynamic
  38. loader has no chance to find out when the function is called. The
  39. macro applies the necessary magic so that profiling is possible.
  40. Rewrite
  41. foo = (*fctp) (arg1, arg2);
  42. into
  43. foo = DL_CALL_FCT (fctp, (arg1, arg2));
  44. */
  45. # define DL_CALL_FCT(fctp, args) \
  46. (_dl_mcount_wrapper_check (fctp), (*(fctp)) args)
  47. /* This function calls the profiling functions. */
  48. extern void _dl_mcount_wrapper_check (void *__selfpc) __THROW;
  49. #endif