54 lines · cpp
1//===--- clock_settime linux implementation ---------------------*- C++ -*-===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/time/clock_settime.h"10#include "hdr/types/clockid_t.h"11#include "hdr/types/struct_timespec.h"12#include "src/__support/OSUtil/syscall.h"13#include "src/__support/common.h"14#include "src/__support/error_or.h"15#include "src/__support/macros/config.h"16#include <sys/syscall.h>17 18#if defined(SYS_clock_settime64)19#include <linux/time_types.h>20#endif21 22namespace LIBC_NAMESPACE_DECL {23namespace internal {24ErrorOr<int> clock_settime(clockid_t clockid, const timespec *ts) {25 int ret;26#if defined(SYS_clock_settime)27 ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_settime,28 static_cast<long>(clockid),29 reinterpret_cast<long>(ts));30#elif defined(SYS_clock_settime64)31 static_assert(32 sizeof(time_t) == sizeof(int64_t),33 "SYS_clock_settime64 requires struct timespec with 64-bit members.");34 35 __kernel_timespec ts64{};36 37 // Populate the 64-bit kernel structure from the user-provided timespec38 ts64.tv_sec = static_cast<decltype(ts64.tv_sec)>(ts->tv_sec);39 ts64.tv_nsec = static_cast<decltype(ts64.tv_nsec)>(ts->tv_nsec);40 41 ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_settime64,42 static_cast<long>(clockid),43 reinterpret_cast<long>(&ts64));44#else45#error "SYS_clock_settime and SYS_clock_settime64 syscalls not available."46#endif47 if (ret < 0)48 return Error(-ret);49 return ret;50}51 52} // namespace internal53} // namespace LIBC_NAMESPACE_DECL54