1  /* Copyright (C) 2003-2023 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
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the 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; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <time.h>
      19  #include <kernel-features.h>
      20  #include <errno.h>
      21  
      22  #include <sysdep-cancel.h>
      23  #include "kernel-posix-cpu-timers.h"
      24  
      25  #include <shlib-compat.h>
      26  
      27  /* We can simply use the syscall.  The CPU clocks are not supported
      28     with this function.  */
      29  int
      30  __clock_nanosleep_time64 (clockid_t clock_id, int flags,
      31  			  const struct __timespec64 *req,
      32  			  struct __timespec64 *rem)
      33  {
      34    if (clock_id == CLOCK_THREAD_CPUTIME_ID)
      35      return EINVAL;
      36    if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
      37      clock_id = PROCESS_CLOCK;
      38  
      39    /* If the call is interrupted by a signal handler or encounters an error,
      40       it returns a positive value similar to errno.  */
      41  
      42  #ifndef __NR_clock_nanosleep_time64
      43  # define __NR_clock_nanosleep_time64 __NR_clock_nanosleep
      44  #endif
      45  
      46    int r;
      47  #ifdef __ASSUME_TIME64_SYSCALLS
      48    r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, clock_id, flags, req,
      49  			       rem);
      50  #else
      51    if (!in_int32_t_range (req->tv_sec))
      52      {
      53        r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, clock_id, flags,
      54  				   req, rem);
      55        if (r == -ENOSYS)
      56  	r = -EOVERFLOW;
      57      }
      58    else
      59      {
      60        struct timespec tr32;
      61        struct timespec ts32 = valid_timespec64_to_timespec (*req);
      62        r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep, clock_id, flags, &ts32,
      63  				   &tr32);
      64        if (INTERNAL_SYSCALL_ERROR_P (r))
      65  	{
      66  	  if (r == -EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
      67  	    *rem = valid_timespec_to_timespec64 (tr32);
      68  	}
      69      }
      70  #endif
      71    return -r;
      72  }
      73  
      74  #if __TIMESIZE != 64
      75  libc_hidden_def (__clock_nanosleep_time64)
      76  
      77  int
      78  __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
      79                     struct timespec *rem)
      80  {
      81    int r;
      82    struct __timespec64 treq64, trem64;
      83  
      84    treq64 = valid_timespec_to_timespec64 (*req);
      85    r = __clock_nanosleep_time64 (clock_id, flags, &treq64,
      86                                  rem != NULL ? &trem64 : NULL);
      87  
      88    if (r == EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
      89      *rem = valid_timespec64_to_timespec (trem64);
      90  
      91    return r;
      92  }
      93  #endif
      94  libc_hidden_def (__clock_nanosleep)
      95  versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17);
      96  /* clock_nanosleep moved to libc in version 2.17;
      97     old binaries may expect the symbol version it had in librt.  */
      98  #if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
      99  strong_alias (__clock_nanosleep, __clock_nanosleep_2);
     100  compat_symbol (libc, __clock_nanosleep_2, clock_nanosleep, GLIBC_2_2);
     101  #endif