elf/libc_early_init.c

   1 /* Early initialization of libc.so, libc.so side.
   2    Copyright (C) 2020-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #include <elision-conf.h>
  21 #include <libc-early-init.h>
  22 #include <libc-internal.h>
  23 #include <lowlevellock.h>
  24 #include <pthread_early_init.h>
  25 #include <sys/single_threaded.h>
  26 #include <getrandom-internal.h>
  27
  28 #ifdef SHARED
  29 _Bool __libc_initial;
  30 #endif
  31
  32 void
  33 __libc_early_init (_Bool initial)
  34 {
  35   /* Initialize ctype data.  */
  36   __ctype_init ();
  37
  38   /* Only the outer namespace is marked as single-threaded.  */
  39   __libc_single_threaded = initial;
  40
  41 #ifdef SHARED
  42   __libc_single_threaded_internal = __libc_initial = initial;
  43 #endif
  44
  45   __pthread_early_init ();
  46
  47   __getrandom_early_init (initial);
  48
  49 #if ENABLE_ELISION_SUPPORT
  50   __lll_elision_init ();
  51 #endif
  52 }