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glibc  2.9
Typedefs | Functions | Variables
dl-init.c File Reference
#include <stddef.h>
#include <ldsodefs.h>

Go to the source code of this file.


typedef void(* init_t )(int, char **, char **)


static void call_init (struct link_map *l, int argc, char **argv, char **env)
void internal_function _dl_init (struct link_map *main_map, int argc, char **argv, char **env)


int _dl_starting_up
int _dl_starting_up_internal attribute_hidden

Typedef Documentation

typedef void(* init_t)(int, char **, char **)

Definition at line 25 of file dl-init.c.

Function Documentation

void internal_function _dl_init ( struct link_map main_map,
int  argc,
char **  argv,
char **  env 

Definition at line 92 of file dl-init.c.

  ElfW(Dyn) *preinit_array = main_map->l_info[DT_PREINIT_ARRAY];
  ElfW(Dyn) *preinit_array_size = main_map->l_info[DT_PREINIT_ARRAYSZ];
  unsigned int i;

  if (__builtin_expect (GL(dl_initfirst) != NULL, 0))
      call_init (GL(dl_initfirst), argc, argv, env);
      GL(dl_initfirst) = NULL;

  /* Don't do anything if there is no preinit array.  */
  if (__builtin_expect (preinit_array != NULL, 0)
      && preinit_array_size != NULL
      && (i = preinit_array_size->d_un.d_val / sizeof (ElfW(Addr))) > 0)
      ElfW(Addr) *addrs;
      unsigned int cnt;

      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
       _dl_debug_printf ("\ncalling preinit: %s\n\n",
                       ? main_map->l_name : rtld_progname);

      addrs = (ElfW(Addr) *) (preinit_array->d_un.d_ptr + main_map->l_addr);
      for (cnt = 0; cnt < i; ++cnt)
       ((init_t) addrs[cnt]) (argc, argv, env);

  /* Stupid users forced the ELF specification to be changed.  It now
     says that the dynamic loader is responsible for determining the
     order in which the constructors have to run.  The constructors
     for all dependencies of an object must run before the constructor
     for the object itself.  Circular dependencies are left unspecified.

     This is highly questionable since it puts the burden on the dynamic
     loader which has to find the dependencies at runtime instead of
     letting the user do it right.  Stupidity rules!  */

  i = main_map->l_searchlist.r_nlist;
  while (i-- > 0)
    call_init (main_map->l_initfini[i], argc, argv, env);

  /* Finished starting up.  */
  INTUSE(_dl_starting_up) = 0;

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static void call_init ( struct link_map l,
int  argc,
char **  argv,
char **  env 
) [static]

Definition at line 35 of file dl-init.c.

  if (l->l_init_called)
    /* This object is all done.  */

  /* Avoid handling this constructor again in case we have a circular
     dependency.  */
  l->l_init_called = 1;

  /* Check for object which constructors we do not run here.  */
  if (__builtin_expect (l->l_name[0], 'a') == '\0'
      && l->l_type == lt_executable)

  /* Are there any constructors?  */
  if (l->l_info[DT_INIT] == NULL
      && __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))

  /* Print a debug message if wanted.  */
  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
    _dl_debug_printf ("\ncalling init: %s\n\n",
                    l->l_name[0] ? l->l_name : rtld_progname);

  /* Now run the local constructors.  There are two forms of them:
     - the one named by DT_INIT
     - the others in the DT_INIT_ARRAY.
  if (l->l_info[DT_INIT] != NULL)
      init_t init = (init_t) DL_DT_INIT_ADDRESS
       (l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr);

      /* Call the function.  */
      init (argc, argv, env);

  /* Next see whether there is an array with initialization functions.  */
  ElfW(Dyn) *init_array = l->l_info[DT_INIT_ARRAY];
  if (init_array != NULL)
      unsigned int j;
      unsigned int jm;
      ElfW(Addr) *addrs;

      jm = l->l_info[DT_INIT_ARRAYSZ]->d_un.d_val / sizeof (ElfW(Addr));

      addrs = (ElfW(Addr) *) (init_array->d_un.d_ptr + l->l_addr);
      for (j = 0; j < jm; ++j)
       ((init_t) addrs[j]) (argc, argv, env);

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Variable Documentation

Definition at line 117 of file rtld.c.

int _dl_starting_up_internal attribute_hidden

Definition at line 25 of file init-first.c.