1//===-- Linux implementation of getrandom ---------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/sys/random/getrandom.h"
10
11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
12#include "src/__support/common.h"
13
14#include "src/__support/libc_errno.h"
15#include "src/__support/macros/config.h"
16#include <sys/syscall.h> // For syscall numbers.
17
18namespace LIBC_NAMESPACE_DECL {
19
20LLVM_LIBC_FUNCTION(ssize_t, getrandom,
21 (void *buf, size_t buflen, unsigned int flags)) {
22 ssize_t ret =
23 LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_getrandom, buf, buflen, flags);
24 if (ret < 0) {
25 libc_errno = static_cast<int>(-ret);
26 return -1;
27 }
28 return ret;
29}
30
31} // namespace LIBC_NAMESPACE_DECL
32

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source code of libc/src/sys/random/linux/getrandom.cpp