43 lines · cpp
1//===-- Implementation of gettimeofday 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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/time/gettimeofday.h"10#include "hdr/time_macros.h"11#include "hdr/types/suseconds_t.h"12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include "src/__support/macros/config.h"15#include "src/__support/time/clock_gettime.h"16#include "src/__support/time/units.h"17 18namespace LIBC_NAMESPACE_DECL {19 20// TODO(michaelrj): Move this into time/linux with the other syscalls.21LLVM_LIBC_FUNCTION(int, gettimeofday,22 (struct timeval * tv, [[maybe_unused]] void *unused)) {23 using namespace time_units;24 if (tv == nullptr)25 return 0;26 27 struct timespec ts;28 auto result = internal::clock_gettime(CLOCK_REALTIME, &ts);29 30 // A negative return value indicates an error with the magnitude of the31 // value being the error code.32 if (!result.has_value()) {33 libc_errno = result.error();34 return -1;35 }36 37 tv->tv_sec = ts.tv_sec;38 tv->tv_usec = static_cast<suseconds_t>(ts.tv_nsec / 1_us_ns);39 return 0;40}41 42} // namespace LIBC_NAMESPACE_DECL43