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//===-- Implementation of sched_getaffinity -------------------------------===//
//
// 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_getaffinity.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/errno/libc_errno.h"
#include <sched.h>
#include <stdint.h>
#include <sys/syscall.h> // For syscall numbers.
namespace __llvm_libc {
LLVM_LIBC_FUNCTION(int, sched_getaffinity,
(pid_t tid, size_t cpuset_size, cpu_set_t *mask)) {
long ret =
__llvm_libc::syscall_impl(SYS_sched_getaffinity, tid, cpuset_size, mask);
if (ret < 0) {
libc_errno = -ret;
return -1;
}
if (size_t(ret) < cpuset_size) {
// This means that only |ret| bytes in |mask| have been set. We will have to
// zero out the remaining bytes.
auto *mask_bytes = reinterpret_cast<uint8_t *>(mask);
for (size_t i = size_t(ret); i < cpuset_size; ++i)
mask_bytes[i] = 0;
}
return 0;
}
} // namespace __llvm_libc
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