44 lines · cpp
1//===-- Implementation file for getitimer ---------------------------------===//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/sys/time/getitimer.h"10#include "hdr/types/struct_itimerval.h"11#include "src/__support/OSUtil/syscall.h"12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include <sys/syscall.h>15 16namespace LIBC_NAMESPACE_DECL {17 18LLVM_LIBC_FUNCTION(int, getitimer, (int which, struct itimerval *curr_value)) {19 long ret = 0;20 if constexpr (sizeof(time_t) > sizeof(long)) {21 // There is no SYS_getitimer_time64 call, so we can't use time_t directly.22 long curr_value32[4];23 ret =24 LIBC_NAMESPACE::syscall_impl<long>(SYS_getitimer, which, curr_value32);25 if (!ret) {26 curr_value->it_interval.tv_sec = curr_value32[0];27 curr_value->it_interval.tv_usec = curr_value32[1];28 curr_value->it_value.tv_sec = curr_value32[2];29 curr_value->it_value.tv_usec = curr_value32[3];30 }31 } else {32 ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_getitimer, which, curr_value);33 }34 35 // On failure, return -1 and set errno.36 if (ret < 0) {37 libc_errno = static_cast<int>(-ret);38 return -1;39 }40 return 0;41}42 43} // namespace LIBC_NAMESPACE_DECL44