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

   1 /* Initialization code run first thing by the ELF startup code.  Linux/i386.
   2    Copyright (C) 2015-2019 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 <time.h>
  20 #include <sysdep.h>
  21 #include <dl-vdso.h>
  22 #include <sysdep-vdso.h>
  23
  24 long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
  25   attribute_hidden;
  26
  27 static long int
  28 clock_gettime_syscall (clockid_t id, struct timespec *tp)
  29 {
  30   INTERNAL_SYSCALL_DECL (err);
  31   return INTERNAL_SYSCALL (clock_gettime, err, 2, id, tp);
  32 }
  33
  34 static inline void
  35 __vdso_platform_setup (void)
  36 {
  37   PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
  38
  39   void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
  40   if (p == NULL)
  41     p = clock_gettime_syscall;
  42   PTR_MANGLE (p);
  43   VDSO_SYMBOL (clock_gettime) = p;
  44 }
  45
  46 #define VDSO_SETUP __vdso_platform_setup
  47
  48 #include <csu/init-first.c>