include/dlfcn.h

   1 #ifndef _DLFCN_H
   2 #include <dlfcn/dlfcn.h>
   3 #include <link.h>               /* For ElfW.  */
   4 #include <stdbool.h>
   5
   6 /* Internally used flag.  */
   7 #define __RTLD_DLOPEN   0x80000000
   8 #define __RTLD_SPROF    0x40000000
   9 #define __RTLD_OPENEXEC 0x20000000
  10 #define __RTLD_CALLMAP  0x10000000
  11 #define __RTLD_AUDIT    0x08000000
  12
  13 #define __LM_ID_CALLER  -2
  14
  15 #ifdef SHARED
  16 /* Locally stored program arguments.  */
  17 extern int __dlfcn_argc attribute_hidden;
  18 extern char **__dlfcn_argv attribute_hidden;
  19 #else
  20 /* These variables are defined and initialized in the startup code.  */
  21 extern int __libc_argc attribute_hidden;
  22 extern char **__libc_argv attribute_hidden;
  23
  24 # define __dlfcn_argc __libc_argc
  25 # define __dlfcn_argv __libc_argv
  26 #endif
  27
  28
  29 /* Now define the internal interfaces.  */
  30
  31 #define __libc_dlopen(name) \
  32   __libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)
  33 extern void *__libc_dlopen_mode  (__const char *__name, int __mode);
  34 extern void *__libc_dlsym   (void *__map, __const char *__name);
  35 extern int   __libc_dlclose (void *__map);
  36 libc_hidden_proto (__libc_dlopen_mode)
  37 libc_hidden_proto (__libc_dlsym)
  38 libc_hidden_proto (__libc_dlclose)
  39
  40 /* Locate shared object containing the given address.  */
  41 #ifdef ElfW
  42 extern int _dl_addr (const void *address, Dl_info *info,
  43                      struct link_map **mapp, const ElfW(Sym) **symbolp)
  44      internal_function;
  45 libc_hidden_proto (_dl_addr)
  46 #endif
  47
  48 /* Close an object previously opened by _dl_open.  */
  49 extern void _dl_close (void *map) attribute_hidden;
  50 /* Same as above, but without locking and safety checks for user
  51    provided map arguments.  */
  52 extern void _dl_close_worker (struct link_map *map) attribute_hidden;
  53
  54 /* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
  55    RTLD_NEXT).  WHO is the calling function, for RTLD_NEXT.  Returns
  56    the symbol value, which may be NULL.  */
  57 extern void *_dl_sym (void *handle, const char *name, void *who)
  58     internal_function;
  59
  60 /* Look up version VERSION of symbol NAME in shared object HANDLE
  61    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
  62    function, for RTLD_NEXT.  Returns the symbol value, which may be
  63    NULL.  */
  64 extern void *_dl_vsym (void *handle, const char *name, const char *version,
  65                        void *who)
  66     internal_function;
  67
  68 /* Call OPERATE, catching errors from `dl_signal_error'.  If there is no
  69    error, *ERRSTRING is set to null.  If there is an error, *ERRSTRING is
  70    set to a string constructed from the strings passed to _dl_signal_error,
  71    and the error code passed is the return value and *OBJNAME is set to
  72    the object name which experienced the problems.  ERRSTRING if nonzero
  73    points to a malloc'ed string which the caller has to free after use.
  74    ARGS is passed as argument to OPERATE.  MALLOCEDP is set to true only
  75    if the returned string is allocated using the libc's malloc.  */
  76 extern int _dl_catch_error (const char **objname, const char **errstring,
  77                             bool *mallocedp, void (*operate) (void *),
  78                             void *args)
  79      internal_function;
  80
  81 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
  82    _dl_catch_error.  Returns zero for success, nonzero for failure; and
  83    arranges for `dlerror' to return the error details.
  84    ARGS is passed as argument to OPERATE.  */
  85 extern int _dlerror_run (void (*operate) (void *), void *args)
  86      internal_function;
  87
  88 #ifdef SHARED
  89 # define DL_CALLER_DECL /* Nothing */
  90 # define DL_CALLER RETURN_ADDRESS (0)
  91 #else
  92 # define DL_CALLER_DECL , void *dl_caller
  93 # define DL_CALLER dl_caller
  94 #endif
  95
  96 struct dlfcn_hook
  97 {
  98   void *(*dlopen) (const char *file, int mode, void *dl_caller);
  99   int (*dlclose) (void *handle);
 100   void *(*dlsym) (void *handle, const char *name, void *dl_caller);
 101   void *(*dlvsym) (void *handle, const char *name, const char *version,
 102                    void *dl_caller);
 103   char *(*dlerror) (void);
 104   int (*dladdr) (const void *address, Dl_info *info);
 105   int (*dladdr1) (const void *address, Dl_info *info,
 106                   void **extra_info, int flags);
 107   int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
 108   void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
 109   void *pad[4];
 110 };
 111
 112 extern struct dlfcn_hook *_dlfcn_hook;
 113 libdl_hidden_proto (_dlfcn_hook)
 114
 115 extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
 116      attribute_hidden;
 117 extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
 118      attribute_hidden;
 119 extern int __dlclose (void *handle)
 120      attribute_hidden;
 121 extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
 122      attribute_hidden;
 123 extern void *__dlvsym (void *handle, const char *name, const char *version
 124                        DL_CALLER_DECL)
 125      attribute_hidden;
 126 extern char *__dlerror (void)
 127      attribute_hidden;
 128 extern int __dladdr (const void *address, Dl_info *info)
 129      attribute_hidden;
 130 extern int __dladdr1 (const void *address, Dl_info *info,
 131                       void **extra_info, int flags)
 132      attribute_hidden;
 133 extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
 134      attribute_hidden;
 135
 136 #ifndef SHARED
 137 struct link_map;
 138 extern void * __libc_dlsym_private (struct link_map *map, const char *name)
 139      attribute_hidden;
 140 extern void __libc_register_dl_open_hook (struct link_map *map)
 141      attribute_hidden;
 142 extern void __libc_register_dlfcn_hook (struct link_map *map)
 143      attribute_hidden;
 144 #endif
 145
 146 #endif