sysdeps/unix/sysv/linux/i386/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  Linux/i386.
   2    Copyright (C) 2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef SHARED
  20 # include <time.h>
  21 # include <sysdep.h>
  22 # include <dl-vdso.h>
  23 # include <libc-vdso.h>
  24
  25 long int (*__vdso_clock_gettime) (clockid_t, struct timespec *)
  26   attribute_hidden;
  27
  28 static long int
  29 clock_gettime_syscall (clockid_t id, struct timespec *tp)
  30 {
  31   INTERNAL_SYSCALL_DECL (err);
  32   return INTERNAL_SYSCALL (clock_gettime, err, 2, id, tp);
  33 }
  34
  35 static inline void
  36 __vdso_platform_setup (void)
  37 {
  38   PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
  39
  40   void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
  41   if (p == NULL)
  42     p = clock_gettime_syscall;
  43   PTR_MANGLE (p);
  44   __vdso_clock_gettime = p;
  45 }
  46
  47 # define VDSO_SETUP __vdso_platform_setup
  48 #endif
  49
  50 #include <csu/init-first.c>