rt/clock-compat.c

   1 /* ABI compatibility redirects for clock_* symbols in librt.
   2    Copyright (C) 2012-2013 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 #include <shlib-compat.h>
  20
  21 /* The clock_* symbols were originally defined in librt and so
  22    are part of its ABI.  As of 2.17, they have moved to libc.
  23    So we supply definitions for librt that just redirect to
  24    their libc counterparts.  */
  25
  26 #if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_17)
  27
  28 #include <time.h>
  29
  30 #ifdef HAVE_IFUNC
  31 # define COMPAT_REDIRECT(name, proto, arglist)                                \
  32   __typeof (name) *name##_ifunc (void) asm (#name);                           \
  33   __typeof (name) *name##_ifunc (void)                                        \
  34   {                                                                           \
  35     return &__##name;                                                         \
  36   }                                                                           \
  37   asm (".type " #name ", %gnu_indirect_function");
  38 #else
  39 # define COMPAT_REDIRECT(name, proto, arglist)                                \
  40   int                                                                         \
  41   name proto                                                                  \
  42   {                                                                           \
  43     return __##name arglist;                                                  \
  44   }
  45 #endif
  46
  47 COMPAT_REDIRECT (clock_getres,
  48                  (clockid_t clock_id, struct timespec *res),
  49                  (clock_id, res))
  50 COMPAT_REDIRECT (clock_gettime,
  51                  (clockid_t clock_id, struct timespec *tp),
  52                  (clock_id, tp))
  53 COMPAT_REDIRECT (clock_settime,
  54                  (clockid_t clock_id, const struct timespec *tp),
  55                  (clock_id, tp))
  56 COMPAT_REDIRECT (clock_getcpuclockid,
  57                  (pid_t pid, clockid_t *clock_id),
  58                  (pid, clock_id))
  59 COMPAT_REDIRECT (clock_nanosleep,
  60                  (clockid_t clock_id, int flags,
  61                   const struct timespec *req,
  62                   struct timespec *rem),
  63                  (clock_id, flags, req, rem))
  64
  65 #endif