libc/src/time/linux/clock_gettime.cpp

   1 //===---------- Linux implementation of the POSIX clock_gettime function --===//
   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/clock_gettime.h"
  10 #include "src/__support/common.h"
  11 #include "src/__support/macros/config.h"
  12 #include "src/__support/time/linux/clock_gettime.h"
  13 #include "src/errno/libc_errno.h"
  14
  15 namespace LIBC_NAMESPACE_DECL {
  16
  17 // TODO(michaelrj): Move this into time/linux with the other syscalls.
  18 LLVM_LIBC_FUNCTION(int, clock_gettime,
  19                    (clockid_t clockid, struct timespec *ts)) {
  20   auto result = internal::clock_gettime(clockid, ts);
  21
  22   // A negative return value indicates an error with the magnitude of the
  23   // value being the error code.
  24   if (!result.has_value()) {
  25     libc_errno = result.error();
  26     return -1;
  27   }
  28   return 0;
  29 }
  30
  31 } // namespace LIBC_NAMESPACE_DECL