1 //===-- Implementation of gettimeofday function ---------------------------===//
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
7 //===----------------------------------------------------------------------===//
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/macros/config.h"
14 #include "src/__support/time/clock_gettime.h"
15 #include "src/__support/time/units.h"
16 #include "src/errno/libc_errno.h"
18 namespace LIBC_NAMESPACE_DECL
{
20 // TODO(michaelrj): Move this into time/linux with the other syscalls.
21 LLVM_LIBC_FUNCTION(int, gettimeofday
,
22 (struct timeval
* tv
, [[maybe_unused
]] void *unused
)) {
23 using namespace time_units
;
28 auto result
= internal::clock_gettime(CLOCK_REALTIME
, &ts
);
30 // A negative return value indicates an error with the magnitude of the
31 // value being the error code.
32 if (!result
.has_value()) {
33 libc_errno
= result
.error();
37 tv
->tv_sec
= ts
.tv_sec
;
38 tv
->tv_usec
= static_cast<suseconds_t
>(ts
.tv_nsec
/ 1_us_ns
);
42 } // namespace LIBC_NAMESPACE_DECL