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//===-- Implementation of sched_rr_get_interval ---------------------------===//
//
// 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/sched/sched_rr_get_interval.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "hdr/types/pid_t.h"
#include "hdr/types/struct_timespec.h"
#include <sys/syscall.h> // For syscall numbers.
#ifdef SYS_sched_rr_get_interval_time64
#include <linux/time_types.h> // For __kernel_timespec.
#endif
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, sched_rr_get_interval,
(pid_t tid, struct timespec *tp)) {
#ifdef SYS_sched_rr_get_interval
int ret =
LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_rr_get_interval, tid, tp);
#elif defined(SYS_sched_rr_get_interval_time64)
// The difference between the and SYS_sched_rr_get_interval
// SYS_sched_rr_get_interval_time64 syscalls is the data type used for the
// time interval parameter: the latter takes a struct __kernel_timespec
int ret;
if (tp) {
struct __kernel_timespec ts32;
ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_rr_get_interval_time64,
tid, &ts32);
if (ret == 0) {
tp->tv_sec = ts32.tv_sec;
tp->tv_nsec = static_cast<long int>(ts32.tv_nsec);
}
} else
// When tp is a nullptr, we still do the syscall to set ret and errno
ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_rr_get_interval_time64,
tid, nullptr);
#else
#error \
"sched_rr_get_interval and sched_rr_get_interval_time64 syscalls not available."
#endif
if (ret < 0) {
libc_errno = -ret;
return -1;
}
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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