sysdeps/unix/sysv/linux/timer_gettime.c

   1 /* Copyright (C) 2003-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If
  16    not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdlib.h>
  20 #include <time.h>
  21 #include <sysdep.h>
  22 #include <kernel-features.h>
  23 #include "kernel-posix-timers.h"
  24 #include <shlib-compat.h>
  25
  26 #if !TIMER_T_WAS_INT_COMPAT
  27 int
  28 ___timer_gettime64 (timer_t timerid, struct __itimerspec64 *value)
  29 {
  30   kernel_timer_t ktimerid = timerid_to_kernel_timer (timerid);
  31
  32 # ifndef __NR_timer_gettime64
  33 #  define __NR_timer_gettime64 __NR_timer_gettime
  34 # endif
  35   int ret = INLINE_SYSCALL_CALL (timer_gettime64, ktimerid, value);
  36 # ifndef __ASSUME_TIME64_SYSCALLS
  37   if (ret == 0 || errno != ENOSYS)
  38     return ret;
  39
  40   struct itimerspec its32;
  41   ret = INLINE_SYSCALL_CALL (timer_gettime, ktimerid, &its32);
  42   if (ret == 0)
  43     {
  44       value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
  45       value->it_value = valid_timespec_to_timespec64 (its32.it_value);
  46     }
  47 # endif
  48   return ret;
  49 }
  50
  51 # if __TIMESIZE == 64
  52 versioned_symbol (libc, ___timer_gettime64, timer_gettime, GLIBC_2_34);
  53 #  if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_34)
  54 compat_symbol (librt, ___timer_gettime64, timer_gettime, GLIBC_2_2);
  55 #  endif
  56
  57 # else /* __TIMESIZE != 64 */
  58 libc_hidden_ver (___timer_gettime64, __timer_gettime64)
  59 versioned_symbol (libc, ___timer_gettime64, __timer_gettime64, GLIBC_2_34);
  60
  61 int
  62 __timer_gettime (timer_t timerid, struct itimerspec *value)
  63 {
  64   struct __itimerspec64 its64;
  65   int retval = __timer_gettime64 (timerid, &its64);
  66   if (retval == 0)
  67     {
  68       value->it_interval = valid_timespec64_to_timespec (its64.it_interval);
  69       value->it_value = valid_timespec64_to_timespec (its64.it_value);
  70     }
  71
  72   return retval;
  73 }
  74 versioned_symbol (libc, __timer_gettime, timer_gettime, GLIBC_2_34);
  75
  76 #  if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_34)
  77 compat_symbol (librt, __timer_gettime, timer_gettime, GLIBC_2_2);
  78 #  endif
  79 # endif /* __TIMESIZE != 64 */
  80
  81 #else /* TIMER_T_WAS_INT_COMPAT */
  82
  83 extern __typeof (timer_gettime) __timer_gettime_new;
  84 libc_hidden_proto (__timer_gettime_new)
  85
  86 int
  87 ___timer_gettime_new (timer_t timerid, struct itimerspec *value)
  88 {
  89   kernel_timer_t ktimerid = timerid_to_kernel_timer (timerid);
  90
  91   return INLINE_SYSCALL_CALL (timer_gettime, ktimerid, value);
  92 }
  93 versioned_symbol (libc, ___timer_gettime_new, timer_gettime, GLIBC_2_34);
  94 libc_hidden_ver (___timer_gettime_new, __timer_gettime_new)
  95
  96 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_3, GLIBC_2_34)
  97 compat_symbol (librt, ___timer_gettime_new, timer_gettime, GLIBC_2_3_3);
  98 # endif
  99
 100 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
 101 int
 102 __timer_gettime_old (int timerid, struct itimerspec *value)
 103 {
 104   return __timer_gettime_new (__timer_compat_list[timerid], value);
 105 }
 106 compat_symbol (librt, __timer_gettime_old, timer_gettime, GLIBC_2_2);
 107 # endif
 108
 109 #endif /* TIMER_T_WAS_INT_COMPAT */