include/dlfcn.h

   1 #ifndef _DLFCN_H
   2 #include <dlfcn/dlfcn.h>
   3 #ifndef _ISOMAC
   4 #include <link.h>               /* For ElfW.  */
   5 #include <stdbool.h>
   6
   7 /* Internally used flag.  */
   8 #define __RTLD_DLOPEN   0x80000000
   9 #define __RTLD_SPROF    0x40000000
  10 #define __RTLD_OPENEXEC 0x20000000
  11 #define __RTLD_CALLMAP  0x10000000
  12 #define __RTLD_AUDIT    0x08000000
  13 #define __RTLD_SECURE   0x04000000 /* Apply additional security checks.  */
  14 #define __RTLD_NOIFUNC  0x02000000 /* Suppress calling ifunc functions.  */
  15
  16 #define __LM_ID_CALLER  -2
  17
  18 #ifdef SHARED
  19 /* Locally stored program arguments.  */
  20 extern int __dlfcn_argc attribute_hidden;
  21 extern char **__dlfcn_argv attribute_hidden;
  22 #else
  23 /* These variables are defined and initialized in the startup code.  */
  24 extern int __libc_argc attribute_hidden;
  25 extern char **__libc_argv attribute_hidden;
  26
  27 # define __dlfcn_argc __libc_argc
  28 # define __dlfcn_argv __libc_argv
  29 #endif
  30
  31
  32 /* Now define the internal interfaces.  */
  33
  34 #define __libc_dlopen(name) \
  35   __libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)
  36 extern void *__libc_dlopen_mode  (const char *__name, int __mode);
  37 extern void *__libc_dlsym   (void *__map, const char *__name);
  38 extern int   __libc_dlclose (void *__map);
  39 libc_hidden_proto (__libc_dlopen_mode)
  40 libc_hidden_proto (__libc_dlsym)
  41 libc_hidden_proto (__libc_dlclose)
  42
  43 /* Locate shared object containing the given address.  */
  44 #ifdef ElfW
  45 extern int _dl_addr (const void *address, Dl_info *info,
  46                      struct link_map **mapp, const ElfW(Sym) **symbolp)
  47      internal_function;
  48 libc_hidden_proto (_dl_addr)
  49 #endif
  50
  51 struct link_map;
  52
  53 /* Close an object previously opened by _dl_open.  */
  54 extern void _dl_close (void *map) attribute_hidden;
  55 /* Same as above, but without locking and safety checks for user
  56    provided map arguments.  */
  57 extern void _dl_close_worker (struct link_map *map, bool force)
  58     attribute_hidden;
  59
  60 /* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
  61    RTLD_NEXT).  WHO is the calling function, for RTLD_NEXT.  Returns
  62    the symbol value, which may be NULL.  */
  63 extern void *_dl_sym (void *handle, const char *name, void *who)
  64     internal_function;
  65
  66 /* Look up version VERSION of symbol NAME in shared object HANDLE
  67    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
  68    function, for RTLD_NEXT.  Returns the symbol value, which may be
  69    NULL.  */
  70 extern void *_dl_vsym (void *handle, const char *name, const char *version,
  71                        void *who)
  72     internal_function;
  73
  74 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
  75    _dl_catch_error.  Returns zero for success, nonzero for failure; and
  76    arranges for `dlerror' to return the error details.
  77    ARGS is passed as argument to OPERATE.  */
  78 extern int _dlerror_run (void (*operate) (void *), void *args)
  79      internal_function;
  80
  81 #ifdef SHARED
  82 # define DL_CALLER_DECL /* Nothing */
  83 # define DL_CALLER RETURN_ADDRESS (0)
  84 #else
  85 # define DL_CALLER_DECL , void *dl_caller
  86 # define DL_CALLER dl_caller
  87 #endif
  88
  89 struct dlfcn_hook
  90 {
  91   void *(*dlopen) (const char *file, int mode, void *dl_caller);
  92   int (*dlclose) (void *handle);
  93   void *(*dlsym) (void *handle, const char *name, void *dl_caller);
  94   void *(*dlvsym) (void *handle, const char *name, const char *version,
  95                    void *dl_caller);
  96   char *(*dlerror) (void);
  97   int (*dladdr) (const void *address, Dl_info *info);
  98   int (*dladdr1) (const void *address, Dl_info *info,
  99                   void **extra_info, int flags);
 100   int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
 101   void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
 102   void *pad[4];
 103 };
 104
 105 extern struct dlfcn_hook *_dlfcn_hook;
 106 libdl_hidden_proto (_dlfcn_hook)
 107
 108 extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
 109      attribute_hidden;
 110 extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
 111      attribute_hidden;
 112 extern int __dlclose (void *handle)
 113      attribute_hidden;
 114 extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
 115      attribute_hidden;
 116 extern void *__dlvsym (void *handle, const char *name, const char *version
 117                        DL_CALLER_DECL)
 118      attribute_hidden;
 119 extern char *__dlerror (void)
 120      attribute_hidden;
 121 extern int __dladdr (const void *address, Dl_info *info)
 122      attribute_hidden;
 123 extern int __dladdr1 (const void *address, Dl_info *info,
 124                       void **extra_info, int flags)
 125      attribute_hidden;
 126 extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
 127      attribute_hidden;
 128
 129 #ifndef SHARED
 130 struct link_map;
 131 extern void * __libc_dlsym_private (struct link_map *map, const char *name)
 132      attribute_hidden;
 133 extern void __libc_register_dl_open_hook (struct link_map *map)
 134      attribute_hidden;
 135 extern void __libc_register_dlfcn_hook (struct link_map *map)
 136      attribute_hidden;
 137 #endif
 138 #endif
 139
 140 #endif