| 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-exception |
| 6 | // |
| 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 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | |
| 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; |
| 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 the |
| 31 | // 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_DECL |
| 43 |