1 | //===-- Implementation of gettimeofday function ---------------------------===// |
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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 | |
11 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
12 | #include "src/__support/common.h" |
13 | #include "src/errno/libc_errno.h" |
14 | #include "src/time/linux/clockGetTimeImpl.h" |
15 | |
16 | #include <sys/syscall.h> // For syscall numbers. |
17 | |
18 | namespace LIBC_NAMESPACE { |
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 | if (tv == nullptr) |
24 | return 0; |
25 | |
26 | struct timespec ts; |
27 | auto result = internal::clock_gettimeimpl(CLOCK_REALTIME, ts: &ts); |
28 | |
29 | // A negative return value indicates an error with the magnitude of the |
30 | // value being the error code. |
31 | if (!result.has_value()) { |
32 | libc_errno = result.error(); |
33 | return -1; |
34 | } |
35 | |
36 | tv->tv_sec = ts.tv_sec; |
37 | tv->tv_usec = static_cast<suseconds_t>(ts.tv_nsec / 1000); |
38 | return 0; |
39 | } |
40 | |
41 | } // namespace LIBC_NAMESPACE |
42 |