19eb11856SSchrodinger ZHU Yifan //===-- Linux implementation of getrandom ---------------------------------===// 29eb11856SSchrodinger ZHU Yifan // 39eb11856SSchrodinger ZHU Yifan // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 49eb11856SSchrodinger ZHU Yifan // See https://llvm.org/LICENSE.txt for license information. 59eb11856SSchrodinger ZHU Yifan // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 69eb11856SSchrodinger ZHU Yifan // 79eb11856SSchrodinger ZHU Yifan //===----------------------------------------------------------------------===// 89eb11856SSchrodinger ZHU Yifan 99eb11856SSchrodinger ZHU Yifan #include "src/sys/random/getrandom.h" 109eb11856SSchrodinger ZHU Yifan 119eb11856SSchrodinger ZHU Yifan #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 129eb11856SSchrodinger ZHU Yifan #include "src/__support/common.h" 139eb11856SSchrodinger ZHU Yifan 14*5ff3ff33SPetr Hosek #include "src/__support/macros/config.h" 15204587a3SSiva Chandra Reddy #include "src/errno/libc_errno.h" 169eb11856SSchrodinger ZHU Yifan #include <sys/syscall.h> // For syscall numbers. 179eb11856SSchrodinger ZHU Yifan 18*5ff3ff33SPetr Hosek namespace LIBC_NAMESPACE_DECL { 199eb11856SSchrodinger ZHU Yifan 209eb11856SSchrodinger ZHU Yifan LLVM_LIBC_FUNCTION(ssize_t, getrandom, 219eb11856SSchrodinger ZHU Yifan (void *buf, size_t buflen, unsigned int flags)) { 22f0a3954eSMichael Jones ssize_t ret = 23b6bc9d72SGuillaume Chatelet LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_getrandom, buf, buflen, flags); 249eb11856SSchrodinger ZHU Yifan if (ret < 0) { 25f0a3954eSMichael Jones libc_errno = static_cast<int>(-ret); 269eb11856SSchrodinger ZHU Yifan return -1; 279eb11856SSchrodinger ZHU Yifan } 28ee361a3fSNoah Goldstein return ret; 299eb11856SSchrodinger ZHU Yifan } 309eb11856SSchrodinger ZHU Yifan 31*5ff3ff33SPetr Hosek } // namespace LIBC_NAMESPACE_DECL 32