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) attribute_hidden;
  58
  59 /* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
  60    RTLD_NEXT).  WHO is the calling function, for RTLD_NEXT.  Returns
  61    the symbol value, which may be NULL.  */
  62 extern void *_dl_sym (void *handle, const char *name, void *who)
  63     internal_function;
  64
  65 /* Look up version VERSION of symbol NAME in shared object HANDLE
  66    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
  67    function, for RTLD_NEXT.  Returns the symbol value, which may be
  68    NULL.  */
  69 extern void *_dl_vsym (void *handle, const char *name, const char *version,
  70                        void *who)
  71     internal_function;
  72
  73 /* Call OPERATE, catching errors from `dl_signal_error'.  If there is no
  74    error, *ERRSTRING is set to null.  If there is an error, *ERRSTRING is
  75    set to a string constructed from the strings passed to _dl_signal_error,
  76    and the error code passed is the return value and *OBJNAME is set to
  77    the object name which experienced the problems.  ERRSTRING if nonzero
  78    points to a malloc'ed string which the caller has to free after use.
  79    ARGS is passed as argument to OPERATE.  MALLOCEDP is set to true only
  80    if the returned string is allocated using the libc's malloc.  */
  81 extern int _dl_catch_error (const char **objname, const char **errstring,
  82                             bool *mallocedp, void (*operate) (void *),
  83                             void *args)
  84      internal_function;
  85
  86 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
  87    _dl_catch_error.  Returns zero for success, nonzero for failure; and
  88    arranges for `dlerror' to return the error details.
  89    ARGS is passed as argument to OPERATE.  */
  90 extern int _dlerror_run (void (*operate) (void *), void *args)
  91      internal_function;
  92
  93 #ifdef SHARED
  94 # define DL_CALLER_DECL /* Nothing */
  95 # define DL_CALLER RETURN_ADDRESS (0)
  96 #else
  97 # define DL_CALLER_DECL , void *dl_caller
  98 # define DL_CALLER dl_caller
  99 #endif
 100
 101 struct dlfcn_hook
 102 {
 103   void *(*dlopen) (const char *file, int mode, void *dl_caller);
 104   int (*dlclose) (void *handle);
 105   void *(*dlsym) (void *handle, const char *name, void *dl_caller);
 106   void *(*dlvsym) (void *handle, const char *name, const char *version,
 107                    void *dl_caller);
 108   char *(*dlerror) (void);
 109   int (*dladdr) (const void *address, Dl_info *info);
 110   int (*dladdr1) (const void *address, Dl_info *info,
 111                   void **extra_info, int flags);
 112   int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
 113   void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
 114   void *pad[4];
 115 };
 116
 117 extern struct dlfcn_hook *_dlfcn_hook;
 118 libdl_hidden_proto (_dlfcn_hook)
 119
 120 extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
 121      attribute_hidden;
 122 extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
 123      attribute_hidden;
 124 extern int __dlclose (void *handle)
 125      attribute_hidden;
 126 extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
 127      attribute_hidden;
 128 extern void *__dlvsym (void *handle, const char *name, const char *version
 129                        DL_CALLER_DECL)
 130      attribute_hidden;
 131 extern char *__dlerror (void)
 132      attribute_hidden;
 133 extern int __dladdr (const void *address, Dl_info *info)
 134      attribute_hidden;
 135 extern int __dladdr1 (const void *address, Dl_info *info,
 136                       void **extra_info, int flags)
 137      attribute_hidden;
 138 extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
 139      attribute_hidden;
 140
 141 #ifndef SHARED
 142 struct link_map;
 143 extern void * __libc_dlsym_private (struct link_map *map, const char *name)
 144      attribute_hidden;
 145 extern void __libc_register_dl_open_hook (struct link_map *map)
 146      attribute_hidden;
 147 extern void __libc_register_dlfcn_hook (struct link_map *map)
 148      attribute_hidden;
 149 #endif
 150 #endif
 151
 152 #endif