63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
//===--- clock_gettime linux implementation ---------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/__support/time/linux/clock_gettime.h"
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#include "hdr/types/clockid_t.h"
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#include "hdr/types/struct_timespec.h"
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#include "src/__support/OSUtil/linux/vdso.h"
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#include "src/__support/OSUtil/syscall.h"
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#include "src/__support/common.h"
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#include "src/__support/error_or.h"
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#include "src/__support/macros/config.h"
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#include <sys/syscall.h>
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#if defined(SYS_clock_gettime64)
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#include <linux/time_types.h>
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#endif
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namespace LIBC_NAMESPACE_DECL {
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namespace internal {
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ErrorOr<int> clock_gettime(clockid_t clockid, timespec *ts) {
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using namespace vdso;
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int ret;
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#if defined(SYS_clock_gettime)
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TypedSymbol<VDSOSym::ClockGetTime> clock_gettime;
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if (LIBC_LIKELY(clock_gettime != nullptr))
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ret = clock_gettime(clockid, ts);
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else
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ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_gettime,
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static_cast<long>(clockid),
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reinterpret_cast<long>(ts));
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#elif defined(SYS_clock_gettime64)
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static_assert(
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sizeof(time_t) == sizeof(int64_t),
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"SYS_clock_gettime64 requires struct timespec with 64-bit members.");
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TypedSymbol<VDSOSym::ClockGetTime64> clock_gettime64;
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__kernel_timespec ts64{};
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if (LIBC_LIKELY(clock_gettime64 != nullptr))
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ret = clock_gettime64(clockid, &ts64);
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else
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ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_gettime64,
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static_cast<long>(clockid),
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reinterpret_cast<long>(&ts64));
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if (ret == 0) {
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ts->tv_sec = static_cast<decltype(ts->tv_sec)>(ts64.tv_sec);
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ts->tv_nsec = static_cast<decltype(ts->tv_nsec)>(ts64.tv_nsec);
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}
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#else
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#error "SYS_clock_gettime and SYS_clock_gettime64 syscalls not available."
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#endif
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if (ret < 0)
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return Error(-ret);
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return ret;
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}
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} // namespace internal
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} // namespace LIBC_NAMESPACE_DECL
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