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//===-- Implementation file for setitimer ---------------------------------===//
//
// 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/sys/time/setitimer.h"
#include "hdr/types/struct_itimerval.h"
#include "src/__support/OSUtil/syscall.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include <sys/syscall.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, setitimer,
(int which, const struct itimerval *new_value,
struct itimerval *old_value)) {
long ret = 0;
if constexpr (sizeof(time_t) > sizeof(long)) {
// There is no SYS_setitimer_time64 call, so we can't use time_t directly,
// and need to convert it to long first.
long new_value32[4] = {static_cast<long>(new_value->it_interval.tv_sec),
static_cast<long>(new_value->it_interval.tv_usec),
static_cast<long>(new_value->it_value.tv_sec),
static_cast<long>(new_value->it_value.tv_usec)};
long old_value32[4];
ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_setitimer, which, new_value32,
old_value32);
if (!ret && old_value) {
old_value->it_interval.tv_sec = old_value32[0];
old_value->it_interval.tv_usec = old_value32[1];
old_value->it_value.tv_sec = old_value32[2];
old_value->it_value.tv_usec = old_value32[3];
}
} else {
ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_setitimer, which, new_value,
old_value);
}
// On failure, return -1 and set errno.
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
return -1;
}
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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