| 1 | //===-- Implementation of gettimeofday function ---------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/time/gettimeofday.h" |
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| 10 | #include "hdr/time_macros.h" |
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| 11 | #include "hdr/types/suseconds_t.h" |
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| 12 | #include "src/__support/common.h" |
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| 13 | #include "src/__support/libc_errno.h" |
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| 14 | #include "src/__support/macros/config.h" |
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| 15 | #include "src/__support/time/clock_gettime.h" |
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| 16 | #include "src/__support/time/units.h" |
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| 17 | |
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| 18 | namespace LIBC_NAMESPACE_DECL { |
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| 19 | |
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| 20 | // TODO(michaelrj): Move this into time/linux with the other syscalls. |
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| 21 | LLVM_LIBC_FUNCTION(int, gettimeofday, |
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| 22 | (struct timeval * tv, [[maybe_unused]] void *unused)) { |
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| 23 | using namespace time_units; |
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| 24 | if (tv == nullptr) |
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| 25 | return 0; |
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| 26 | |
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| 27 | struct timespec ts; |
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| 28 | auto result = internal::clock_gettime(CLOCK_REALTIME, &ts); |
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| 29 | |
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| 30 | // A negative return value indicates an error with the magnitude of the |
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| 31 | // value being the error code. |
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| 32 | if (!result.has_value()) { |
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| 33 | libc_errno = result.error(); |
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| 34 | return -1; |
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| 35 | } |
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| 36 | |
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| 37 | tv->tv_sec = ts.tv_sec; |
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| 38 | tv->tv_usec = static_cast<suseconds_t>(ts.tv_nsec / 1_us_ns); |
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| 39 | return 0; |
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| 40 | } |
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| 41 | |
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| 42 | } // namespace LIBC_NAMESPACE_DECL |
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| 43 | |
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