libc/src/sys/random/linux/getrandom.cpp

//===-- Linux implementation of getrandom ---------------------------------===//
//
// 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/random/getrandom.h"

#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"

#include "src/errno/libc_errno.h"
#include <sys/syscall.h> // For syscall numbers.

namespace __llvm_libc {

LLVM_LIBC_FUNCTION(ssize_t, getrandom,
                   (void *buf, size_t buflen, unsigned int flags)) {
  long ret = __llvm_libc::syscall_impl(SYS_getrandom, buf, buflen, flags);
  if (ret < 0) {
    libc_errno = -ret;
    return -1;
  }
  return ret;
}

} // namespace __llvm_libc