| //===--- clock_gettime linux implementation ---------------------*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_GETTIME_H |
| #define LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_GETTIME_H |
| |
| #include "hdr/types/clockid_t.h" |
| #include "hdr/types/struct_timespec.h" |
| #include "src/__support/OSUtil/syscall.h" |
| #include "src/__support/common.h" |
| #include "src/__support/error_or.h" |
| #include <sys/syscall.h> |
| |
| namespace LIBC_NAMESPACE { |
| namespace internal { |
| LIBC_INLINE ErrorOr<int> clock_gettime(clockid_t clockid, timespec *ts) { |
| #if SYS_clock_gettime |
| int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_gettime, |
| static_cast<long>(clockid), |
| reinterpret_cast<long>(ts)); |
| #elif defined(SYS_clock_gettime64) |
| static_assert( |
| sizeof(time_t) == sizeof(int64_t), |
| "SYS_clock_gettime64 requires struct timespec with 64-bit members."); |
| int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_gettime64, |
| static_cast<long>(clockid), |
| reinterpret_cast<long>(ts)); |
| #else |
| #error "SYS_clock_gettime and SYS_clock_gettime64 syscalls not available." |
| #endif |
| if (ret < 0) |
| return Error(-ret); |
| return ret; |
| } |
| |
| } // namespace internal |
| } // namespace LIBC_NAMESPACE |
| |
| #endif // LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_GETTIME_H |