include/dlfcn.h

   1 #ifndef _DLFCN_H
   2 #include <dlfcn/dlfcn.h>
   3 #include <link.h>               /* For ElfW.  */
   4
   5 /* Internally used flag.  */
   6 #define __RTLD_DLOPEN   0x80000000
   7 #define __RTLD_SPROF    0x40000000
   8 #define __RTLD_OPENEXEC 0x20000000
   9 #define __RTLD_CALLMAP  0x10000000
  10
  11 #define __LM_ID_CALLER  -2
  12
  13 /* Now define the internal interfaces.  */
  14
  15 #define __libc_dlopen(name) __libc_dlopen_mode (name, RTLD_LAZY)
  16 extern void *__libc_dlopen_mode  (__const char *__name, int __mode);
  17 extern void *__libc_dlsym   (void *__map, __const char *__name);
  18 extern int   __libc_dlclose (void *__map);
  19 libc_hidden_proto (__libc_dlopen_mode)
  20 libc_hidden_proto (__libc_dlsym)
  21 libc_hidden_proto (__libc_dlclose)
  22
  23 /* Locate shared object containing the given address.  */
  24 #ifdef ElfW
  25 extern int _dl_addr (const void *address, Dl_info *info,
  26                      struct link_map **mapp, const ElfW(Sym) **symbolp)
  27      internal_function;
  28 libc_hidden_proto (_dl_addr)
  29 #endif
  30
  31 /* Open the shared object NAME, relocate it, and run its initializer if it
  32    hasn't already been run.  MODE is as for `dlopen' (see <dlfcn.h>).  If
  33    the object is already opened, returns its existing map.  */
  34 extern void *_dl_open (const char *name, int mode, const void *caller,
  35                        Lmid_t nsid)
  36      internal_function;
  37 libc_hidden_proto (_dl_open)
  38
  39 /* Close an object previously opened by _dl_open.  */
  40 extern void _dl_close (void *map)
  41      internal_function;
  42 libc_hidden_proto (_dl_close)
  43
  44 /* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
  45    RTLD_NEXT).  WHO is the calling function, for RTLD_NEXT.  Returns
  46    the symbol value, which may be NULL.  */
  47 extern void *_dl_sym (void *handle, const char *name, void *who)
  48     internal_function;
  49
  50 /* Look up version VERSION of symbol NAME in shared object HANDLE
  51    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
  52    function, for RTLD_NEXT.  Returns the symbol value, which may be
  53    NULL.  */
  54 extern void *_dl_vsym (void *handle, const char *name, const char *version,
  55                        void *who)
  56     internal_function;
  57
  58 /* Call OPERATE, catching errors from `dl_signal_error'.  If there is no
  59    error, *ERRSTRING is set to null.  If there is an error, *ERRSTRING is
  60    set to a string constructed from the strings passed to _dl_signal_error,
  61    and the error code passed is the return value and *OBJNAME is set to
  62    the object name which experienced the problems.  ERRSTRING if nonzero
  63    points to a malloc'ed string which the caller has to free after use.
  64    ARGS is passed as argument to OPERATE.  */
  65 extern int _dl_catch_error (const char **objname, const char **errstring,
  66                             void (*operate) (void *),
  67                             void *args)
  68      internal_function;
  69
  70 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
  71    _dl_catch_error.  Returns zero for success, nonzero for failure; and
  72    arranges for `dlerror' to return the error details.
  73    ARGS is passed as argument to OPERATE.  */
  74 extern int _dlerror_run (void (*operate) (void *), void *args)
  75      internal_function;
  76
  77 #ifdef SHARED
  78 # define DL_CALLER_DECL /* Nothing */
  79 # define DL_CALLER RETURN_ADDRESS (0)
  80 #else
  81 # define DL_CALLER_DECL , void *dl_caller
  82 # define DL_CALLER dl_caller
  83 #endif
  84
  85 struct dlfcn_hook
  86 {
  87   void *(*dlopen) (const char *file, int mode, void *dl_caller);
  88   int (*dlclose) (void *handle);
  89   void *(*dlsym) (void *handle, const char *name, void *dl_caller);
  90   void *(*dlvsym) (void *handle, const char *name, const char *version,
  91                    void *dl_caller);
  92   char *(*dlerror) (void);
  93   int (*dladdr) (const void *address, Dl_info *info);
  94   int (*dladdr1) (const void *address, Dl_info *info,
  95                   void **extra_info, int flags);
  96   int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
  97   void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
  98   void *pad[4];
  99 };
 100
 101 extern struct dlfcn_hook *_dlfcn_hook;
 102 libdl_hidden_proto (_dlfcn_hook)
 103
 104 extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
 105      attribute_hidden;
 106 extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
 107      attribute_hidden;
 108 extern int __dlclose (void *handle)
 109      attribute_hidden;
 110 extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
 111      attribute_hidden;
 112 extern void *__dlvsym (void *handle, const char *name, const char *version
 113                        DL_CALLER_DECL)
 114      attribute_hidden;
 115 extern char *__dlerror (void)
 116      attribute_hidden;
 117 extern int __dladdr (const void *address, Dl_info *info)
 118      attribute_hidden;
 119 extern int __dladdr1 (const void *address, Dl_info *info,
 120                       void **extra_info, int flags)
 121      attribute_hidden;
 122 extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
 123      attribute_hidden;
 124
 125 #ifndef SHARED
 126 struct link_map;
 127 extern void * __libc_dlsym_private (struct link_map *map, const char *name)
 128      attribute_hidden;
 129 extern void __libc_register_dl_open_hook (struct link_map *map)
 130      attribute_hidden;
 131 extern void __libc_register_dlfcn_hook (struct link_map *map)
 132      attribute_hidden;
 133 #endif
 134
 135 #endif