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//===-- 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 "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/errno/libc_errno.h"
#include <sys/syscall.h> // For syscall numbers.
namespace __llvm_libc {
// TODO(michaelrj): Move this into time/linux with the other syscalls.
LLVM_LIBC_FUNCTION(int, gettimeofday,
(struct timeval * tv, [[maybe_unused]] void *unused)) {
if (tv == nullptr)
return 0;
struct timespec tp;
long ret_val = __llvm_libc::syscall_impl(SYS_clock_gettime,
static_cast<long>(CLOCK_REALTIME),
reinterpret_cast<long>(&tp));
// A negative return value indicates an error with the magnitude of the
// value being the error code.
if (ret_val < 0) {
libc_errno = -ret_val;
return -1;
}
tv->tv_sec = tp.tv_sec;
tv->tv_usec = tp.tv_nsec / 1000;
return 0;
}
} // namespace __llvm_libc
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