Back to index

glibc  2.9
init-first.c
Go to the documentation of this file.
00001 /* Copyright (C) 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifdef SHARED
00020 # include <dl-vdso.h>
00021 # include <bits/libc-vdso.h>
00022 
00023 long int (*__vdso_gettimeofday) (struct timeval *, void *) attribute_hidden;
00024 
00025 long int (*__vdso_clock_gettime) (clockid_t, struct timespec *)
00026   __attribute__ ((nocommon));
00027 strong_alias (__vdso_clock_gettime, __GI___vdso_clock_gettime attribute_hidden)
00028 
00029 
00030 static inline void
00031 _libc_vdso_platform_setup (void)
00032 {
00033   PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
00034 
00035   void *p = _dl_vdso_vsym ("gettimeofday", &linux26);
00036   /* If the vDSO is not available we fall back on the old vsyscall.  */
00037 #define VSYSCALL_ADDR_vgettimeofday       0xffffffffff600000ul
00038   if (p == NULL)
00039     p = (void *) VSYSCALL_ADDR_vgettimeofday;
00040   PTR_MANGLE (p);
00041   __vdso_gettimeofday = p;
00042 
00043   p = _dl_vdso_vsym ("clock_gettime", &linux26);
00044   PTR_MANGLE (p);
00045   __GI___vdso_clock_gettime = p;
00046 }
00047 
00048 # define VDSO_SETUP _libc_vdso_platform_setup
00049 #endif
00050 
00051 #include "../init-first.c"