| //===-- Implementation of gettimeofday function ---------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/time/gettimeofday.h" |
| #include "hdr/time_macros.h" |
| #include "hdr/types/suseconds_t.h" |
| #include "src/__support/common.h" |
| #include "src/__support/time/linux/clock_gettime.h" |
| #include "src/__support/time/units.h" |
| #include "src/errno/libc_errno.h" |
| |
| namespace LIBC_NAMESPACE { |
| |
| // TODO(michaelrj): Move this into time/linux with the other syscalls. |
| LLVM_LIBC_FUNCTION(int, gettimeofday, |
| (struct timeval * tv, [[maybe_unused]] void *unused)) { |
| using namespace time_units; |
| if (tv == nullptr) |
| return 0; |
| |
| struct timespec ts; |
| auto result = internal::clock_gettime(CLOCK_REALTIME, &ts); |
| |
| // A negative return value indicates an error with the magnitude of the |
| // value being the error code. |
| if (!result.has_value()) { |
| libc_errno = result.error(); |
| return -1; |
| } |
| |
| tv->tv_sec = ts.tv_sec; |
| tv->tv_usec = static_cast<suseconds_t>(ts.tv_nsec / 1_us_ns); |
| return 0; |
| } |
| |
| } // namespace LIBC_NAMESPACE |