sysdeps/unix/sysv/linux/sched_rr_gi.c

   1 /* sched_rr_get_interval -- get the scheduler's SCHED_RR policy time interval.
   2    Copyright (C) 2020-2021 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include <kernel-features.h>
  24
  25 int
  26 __sched_rr_get_interval64 (pid_t pid, struct __timespec64 *tp)
  27 {
  28 #ifndef __NR_sched_rr_get_interval_time64
  29 # define __NR_sched_rr_get_interval_time64 __NR_sched_rr_get_interval
  30 #endif
  31   int ret = INLINE_SYSCALL_CALL (sched_rr_get_interval_time64, pid, tp);
  32 #ifndef __ASSUME_TIME64_SYSCALLS
  33   if (ret == 0 || errno != ENOSYS)
  34     return ret;
  35
  36   struct timespec tp32;
  37   ret = INLINE_SYSCALL_CALL (sched_rr_get_interval, pid, &tp32);
  38   if (ret == 0)
  39     *tp = valid_timespec_to_timespec64 (tp32);
  40 #endif
  41   return ret;
  42 }
  43
  44 #if __TIMESIZE != 64
  45 libc_hidden_def (__sched_rr_get_interval64)
  46
  47 int
  48 __sched_rr_get_interval (pid_t pid, struct timespec *tp)
  49 {
  50   int ret;
  51   struct __timespec64 tp64;
  52
  53   ret = __sched_rr_get_interval64 (pid, &tp64);
  54
  55   if (ret == 0)
  56     {
  57       if (! in_time_t_range (tp64.tv_sec))
  58         {
  59           __set_errno (EOVERFLOW);
  60           return -1;
  61         }
  62
  63       *tp = valid_timespec64_to_timespec (tp64);
  64     }
  65
  66   return ret;
  67 }
  68 #endif
  69 strong_alias (__sched_rr_get_interval, sched_rr_get_interval)