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 libc_hidden_proto (_dl_addr)
  48 #endif
  49
  50 struct link_map;
  51
  52 /* Close an object previously opened by _dl_open.  */
  53 extern void _dl_close (void *map) attribute_hidden;
  54 /* Same as above, but without locking and safety checks for user
  55    provided map arguments.  */
  56 extern void _dl_close_worker (struct link_map *map, bool force)
  57     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
  64 /* Look up version VERSION of symbol NAME in shared object HANDLE
  65    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
  66    function, for RTLD_NEXT.  Returns the symbol value, which may be
  67    NULL.  */
  68 extern void *_dl_vsym (void *handle, const char *name, const char *version,
  69                        void *who);
  70
  71 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
  72    _dl_catch_error.  Returns zero for success, nonzero for failure; and
  73    arranges for `dlerror' to return the error details.
  74    ARGS is passed as argument to OPERATE.  */
  75 extern int _dlerror_run (void (*operate) (void *), void *args);
  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 #endif
 135
 136 #endif