libc/src/time/linux/timespec_get.cpp

   1 //===-- Implementation of timespec_get for Linux --------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/time/timespec_get.h"
  10 #include "hdr/time_macros.h"
  11 #include "src/__support/common.h"
  12 #include "src/__support/macros/config.h"
  13 #include "src/__support/time/clock_gettime.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 LLVM_LIBC_FUNCTION(int, timespec_get, (struct timespec * ts, int base)) {
  19   clockid_t clockid;
  20   switch (base) {
  21   case TIME_UTC:
  22     clockid = CLOCK_REALTIME;
  23     break;
  24   case TIME_MONOTONIC:
  25     clockid = CLOCK_MONOTONIC;
  26     break;
  27   case TIME_ACTIVE:
  28     clockid = CLOCK_PROCESS_CPUTIME_ID;
  29     break;
  30   case TIME_THREAD_ACTIVE:
  31     clockid = CLOCK_THREAD_CPUTIME_ID;
  32     break;
  33   default:
  34     return 0;
  35   }
  36
  37   auto result = internal::clock_gettime(clockid, ts);
  38   if (!result.has_value()) {
  39     libc_errno = result.error();
  40     return 0;
  41   }
  42   return base;
  43 }
  44
  45 } // namespace LIBC_NAMESPACE_DECL