libc/src/__support/OSUtil/linux/getrandom.h

//===------------ Implementation of getrandom function ----------*- 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_OSUTIL_GETRANDOM_H
#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_GETRANDOM_H

#include "hdr/types/ssize_t.h"
#include "src/__support/OSUtil/linux/syscall.h" // syscall_impl
#include "src/__support/common.h"
#include "src/__support/error_or.h"
#include "src/__support/macros/config.h"
#include <sys/syscall.h> // For syscall numbers

namespace LIBC_NAMESPACE_DECL {
namespace internal {

LIBC_INLINE static ErrorOr<ssize_t> getrandom(void *buf, size_t buflen,
                                              unsigned int flags) {
  ssize_t ret =
      LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_getrandom, buf, buflen, flags);
  if (ret < 0) {
    return Error(-static_cast<int>(ret));
  }
  return ret;
}

} // namespace internal
} // namespace LIBC_NAMESPACE_DECL

#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_GETRANDOM_H